Daylighting Help Guides

Introduction – LightStanza for Daylight

For a two-minute overview of the software, check out this video:

Other LightStanza Help Guides

Tutorial Videos

Support Forums

LightStanza has a community support forum, where users can ask and answer questions.

You can also find information at Unmet Hours, a question-and-answer resource for the building energy and performance modeling community. To ask a new question about LightStanza, click here. To look for existing answers, click here.

Reference Guides

You can also visit LightStanza’s website for Daylight Terms & Metrics or the sDA Series for a complete rundown on daylight terms, metrics, and news.
Still Have Questions?

If you are unable find the answers you are looking for, feel free to contact us directly.

 

LightStanza Office: (720) 722-0771 (during business hours M-F 8-5pm MT)
Email: support@lightstanza.com (24 hours, 7 days a week!)

Modeling for Daylight

This section will teach you how to use your 3D modeling tool to prepare for generating results in LightStanza. Then it will explain how to kick off simulations from the activity bar using the left toolbar simulation settings.

How to Create Windows

In SketchUp – Windows are recognized as glass materials (less than 100% Opacity).

In Revit – Windows are recognized as glass materials (less than 100% Opacity).

In Rhino – There are two methods to import objects as windows from Rhino —by layer name or by display color.

The first method is to place all windows in Rhino on a layer named “windows,” “glass,” “glazing”, or “glazing”, or any name that includes these keywords (all case-insensitive). LightStanza will automatically recognize this and create windows accordingly, overriding any display color settings (see below):



The second method is to set the display color of glass objects to a blue hue (red and green components set to 0, blue set to any non-zero value). Note that this is based on the display color, not the material color:

If an objects display color is set to “By layer” and the layer display color is blue, that object will also be recognized as glass.

If you plan on having different materials for different window sets in LightStanza, you can apply different hues of blue (RGB(0,0,1-255)) to different window groups in Rhino. For example, if 20 windows have double pane glass, and 20 windows have dynamic glass, you could apply RGB(0,0,254) to the 20 double pane glass windows, and RGB(0,0,253) to the 20 dynamic glass windows. Once you upload this model to LightStanza, you can change all of your same-colored windows to a new material at once.

Modeling Unit Skylights

In SketchUp – Skylights are recognized as glass materials (less than 100% Opacity).

In Revit – Skylights are recognized as glass materials (less than 100% Opacity).

In Rhino – While skylights are recognized as glass materials in SketchUp and Revit, in Rhino you must set the display colors of the skylights to a shade of opaque blue ((RGB(0,0,1-255)); see above), or include the words “glass”, “window”, or “glazing” in the layer name in order for it to be recognized in LightStanza.

When applying materials to your skylights in LightStanza, you can use regular glass or translucent materials, or you can use complex glazing materials (BSDF’s). It is important to remember that Acuity Brands’ complex glazing materials require specific skylight dimensions, which are outlined here: Acuity Brands’ Sunoptics® Signature Series Skylights:
  1. Sunoptics® 4040 Signature Series Double-Glazed Acrylic Prismatic Skylight – 5114” x 5114” openings
  2. Sunoptics® 4040 Signature Series Double-Glazed Polycarbonate Prismatic Skylight – 5114” x 5114” openings
  3. Sunoptics® 4080 Signature Series Double-Glazed Acrylic Prismatic Skylight – 5214” x 10014” openings
  4. Sunoptics® 4080 Signature Series Double-Glazed Polycarbonate Prismatic Skylight – 5214” x 10014” openings
  5. Sunoptics® 5060 Signature Series Double-Glazed Acrylic Prismatic Skylight – 6358” x 6358” openings
  6. Sunoptics® 5060 Signature Series Double-Glazed Polycarbonate Prismatic Skylight – 6358” x 6358” openings

Modeling SageGlass

The SageGlass product implemented in LightStanza is typically (but doesn’t have to be!) used in a multi-zone configuration, separated into multiple horizontal zones that can be independently tinted.  

To utilize multi-zone tinting, in your 3D modeling software split your facades into distinct panes of glass (rather than one solid piece) so that LightStanza knows where you would like transitions between tint zones to occur. 

SageGlass typically defines three zones using the following criteria:

Lower Zone: The top of the pane/zone is less than or equal to 2.5 feet from the floor

Upper Zone: The bottom of the pane/zone is greater than or equal to 6 feet from the floor

Middle Zone: Any pane not meeting the criteria for upper or lower zones.

Once your model is loaded into LightStanza, you are ready to apply SageGlass to your design.

  1. Click on the material panel in the left-hand toolbar
  2. Click on the product library tab
  3. Select “SageGlass”
  4. There are two methods to classifying your windows into zones, manually and automatically.  Using the “Advanced” drop-down menu, you may apply one of the three zone materials for the most precise control. Or, you may apply the “Automatic Zone” material and LightStanza will assign a zone based on your model geometry.
  5. After selecting the material, you will automatically be placed in “paint-by-group” mode (note the yellow, active paint bucket icon with a “G” under the SageGlass material ). This mode allows you to paint all windows in a “window group” (automatically assigned using LightStanza’s grouping algorithm on model import) with a single click. Note that when using SageGlass, all windows in a group *must* be the same SageGlass material.
  6. Using your mouse cursor (now a paint bucket icon), click on the group you would like to assign as SageGlass.
    1. Advanced option 1: To change all windows of an initial material to SageGlass, you can first use the “Select All” button () on the original material – this will highlight all windows with that material a pink color. Then click the paint bucket under the SageGlass material, and paint it on any of the selected windows. This will apply SageGlass to all selected windows.
    2. Advanced option 2: If all of the windows to which you are applying SageGlass are on the same layer, you can also assign the SageGlass material to an entire panel by going into the Layers panel in the left-hand toolbar and clicking the edit button on the desired layer.

And that’s it! SageGlass provides intelligent, well-tested defaults for all parameters controlling tint states. However, you may also edit these parameters to suit your needs and performance goals. Note that all SageGlass in a design must use the same settings; if you have multiple SageGlass materials in your design, editing one will update any others. To edit the parameters controlling SageGlass tints:

  1. Click the “Edit Material” icon () under the SageGlass material.
  2. Click the container for one of the algorithm control groups to adjust parameters:
    1. Glare Control: This controls where LightStanza will test for solar glare and set the SageGlass tint accordingly (if required based on sky conditions).
      1. Test Points: LightStanza will place glare test-points inside the design at the specified horizontal distance from the facade and height above the floor.  You may specify up to 3 points.
    2. Daylight Control: For zones where glare is not a concern, the vertical illuminance immediately exterior to the zone is used to determine the appropriate tint state.
      1. Set Point: This single value is scaled automatically into appropriate values for lower, middle, and upper zones. Larger set points mean exterior illuminance values will need to be higher to increase the tint amount.  Vice-versa for lower set points.
      2. Heating and Cooling Periods: If this toggle is selected, you can set date ranges that use distinct set points to optimize daylight in conjunction with solar heat gain.

In multi-zone configurations (i.e. more than one zone type on a facade), LightStanza and the SageGlass algorithm will automatically provide neutral color rendering by ensuring that not all zones are tinted simultaneously.

Now you are ready to start simulating SageGlass!  Simply kick off any new simulation type in the activity panel on the right, and LightStanza will do the rest!

If running a point-in-time rendering or an annual grid calculation, you can opt to include a SageGlass tint schedule in your report data.  Simply click the checkbox labeled “Downloadable SageGlass tint schedule in .csv format” in the simulation options dialog.

Once your simulation is finished, open the 2D report (insert clipboard icon here), and click the “Download report data” button at the top-right. This will download a zip file that includes all of your report data and the SageGlass tint schedule for each zone!

Modeling Tubular Daylight Devices

Modeling tubular daylight devices (TDDs) for accurate daylighting simulations is a unique, possibly unintuitive process. Here are some general guidlines to keep in mind:

  1. Some modeling software (e.g. Revit) includes pre-built TDD assemblies. We do not recommend using these. While visually appealing, they contain complex geometry that will slow simulations and are not necessary. If they are not set up specifically for simulations they can lead to inaccurate results. See below if your model includes these.
  2. The BSDF files used to simulate TDDs include information on how light is transmitted through the entire TDD assembly, from the light-collecting dome, through the tube, and out the diffuser. The BSDF material is only applied to the diffuser (see Figure 1) in your model, and LightStanza does the rest. Therefore, the other components of the TDD assembly in your model are actually not important. You can accurately simulate a TDD with just a diffuser below the ceiling in your model.
  3. It is critical that all components of the TDD assembly except the diffuser are opaque, since light does not need to actually transmit through them in simulations. If they are not opaque, extra light will enter your space and interfere with accurate simulation of the TDD.
We recommend modeling your TDDs as simply as you can. Placing a glass rectangle to represent the diffuser slightly below the ceiling, for a closed ceiling with no tube, is sufficient. If the TDD is inserted in an open-ceiling application, then its diffuser should be lowered to the point that it will exist in this application (e.g. this can be several feet). If you would like to include more of the assembly for visualizations, we recommend a simple cylinder representing the tube. See below for guidelines specific to different modeling software.

Figure 1: Apply the BSDF material only to the diffuser, not any other part of the TDD assembly.
In SketchUp
  1. In your 3D model, place the diffusing polygons inside BELOW the ceiling at least 1/2 inch. Make sure that there are no openings on the roof above the TDD polygons so that they are fully excluded from the sun. Please see Figure 1 above. It does not matter what type of material (e.g. transparent, opaque) you assign the the diffusing polygon before importing.
    1. Make sure that the TDD polygons are the dimensions specified by the manufacturer. For Acuity Brands’ Sunoptics® LightFlex™ Tubular Daylighting Systems, please use 24″x24″ openings that are fully excluded from the sun.
  2. After you have saved your model and uploaded it to LightStanza, you can apply TDD materials to your TDD polygons. Click the Materials tab in the left toolbar, then click on either “Product Library” to use one of our manufacturing partners’ TDDs, or click “Uploaded BSDF Library” to upload your own TDD BSDF file. Apply the desired material(s) to the TDD polygons using the paint bucket. Paint ONLY the (outer) diffusing polygon with the TDD material. Only 1 polygon should be painted the TDD material. Please see Figure 1 above.
  3. Do not paint any other part of the TDD, including the inside or outside of its tube, or any part of the collector on the roof. LightStanza applies an accurate BSDF to the diffuser (step 2) only. Please see Figure 1 above.
In Revit
  1. In your 3D model, place the diffusing polygons inside BELOW the ceiling at least 1/2 inch (see below for instructions on modeling TDD diffusers as simple panes). The diffusing polygons must be a transparent material in Revit so that LightStanza recognizes it as glass when importing. Make sure that there are no openings on the roof above the TDD polygons so that they are fully excluded from the sun. Please see Figure 1 above.
    1. Make sure that the TDD polygons are the dimensions specified by the manufacturer. For Acuity Brands’ Sunoptics® LightFlex™ Tubular Daylighting Systems, please use 24″x24″ openings that are fully excluded from the sun.
  2. After you have saved your model and uploaded it to LightStanza, you can apply TDD materials to your TDD polygons. Click the Materials tab in the left toolbar, then click on either “Product Library” to use one of our manufacturing partners’ TDDs, or click “Uploaded BSDF Library” to upload your own TDD BSDF file. Apply the desired material(s) to the TDD polygons using the paint bucket. Paint ONLY the (outer) diffusing polygon with the TDD material. Only 1 polygon should be painted the TDD material. Please see Figure 1 above.
  3. Do not paint any other part of the TDD, including the inside or outside of its tube, or any part of the collector on the roof. LightStanza applies an accurate BSDF to the diffuser (step 2) only. Please see Figure 1 above.

Revit Simple Diffuser Panes

Since the diffuser is the only necessary piece to simulate TDDs, we recommend modeling only the diffuser in Revit for simplicity. Here are the steps to achieve this.
  1. First, create a new material to use for the diffusers. This material must be transparent to be properly modeled by LightStanza. Go to the “Manage” tab, then click on “Materials.” Below the material list on the left, click the “+” button to create a new material. Rename it to something easy to find (e.g. “TDD Diffuser”), and then adjust the “transparency” property to a non-zero value. Keep all other defaults:
  2. Next, create a new level offset from the ceiling by at least 1/2″ where the diffusers will be placed. In the project browser on the left, double click on any of the “Elevations” views. Click on an existing level to select it, and type “cs” (short for “create similar”) to make a new level. Set the level to the desired diffuser height. Here is an example of an existing ceiling level at 10′, with a TDD diffuser level 6″ below:
  3. Now go to your newly created level by double clicking its name in the project browser floor plan views. To create the polygon representing the TDD diffuser, click on the “Architecture” tab at the top of the window, click the dropdown menu for “Component”, then click “Model In-Place”:
  4. You can select a family to associate the new components with (“Windows” is a good default choice, but not required).
  5. Then, click on “Extrusion” to create a new extrusion geometry:
  6. You can now draw the border of the TDD diffuser in the floor plan view, using the desired dimensions (these are typically specified with the BSDF file you are using), and click the green check mark in the top menu to finish the drawing. In the properties box on the left side, change the “Extrusion End” to 0′ 2″ (leave the “Extrusion Start” at 0). Also click the “…” box in the material row, and select the TDD Diffuser material you created in step one:
  7. If necessary, select the extrusion you just created in the floor plan, and copy and paste more diffusers and move them to their desired locations. Then click on the green check mark labeled “Finish Model” in the top toolbar.
  8. That’s it! Now you can export your model to LightStanza, and paint the desired TDD BSDF materials onto the newly-created diffusers.

Revit TDD Assembly Families

If you are using pre-defined Revit families to model your TDDs (not recommended), some editing of the family properties is likely necessary for accurate simulations. In particular, the diffuser must be a glass/transparent material and all other components must be opaque. It is also recommended that you edit the thickness of the diffusing polygon. Follow the steps below to edit a Revit TDD family.

  1. Double-click on any TDD in your model to open the Revit family editor. A 3D representation of the TDD assembly will open in a new tab. Click on any part of the TDD to see its properties in the left panel:


  2. To edit properties of each component of the TDD assembly, you will first need to un-associate the family parameters. First click on the “=” button next to each material in the left panel, then select “none” in the window that opens:



  3. Set each component of the TDD, except for the diffuser, to a material with no transparency. To edit a material, click on the current material in the left panel, and then open the material editor by clicking the “…” button:


    This will open the material editor, where you can select from current materials or create new ones. The key parameter to watch out for is the transparency — the diffuser must have some transparency, and all other parts must have 0 transparency:


  4. You will also need to edit some additional parameters of just the diffuser. Select just the diffuser (not the whole TDD assembly) by zooming in and clicking on its outer edge (see image below). Edit the material of the diffuser here to a transparent one as well, in the same way as described in the previous steps.Generally the diffuser polygon is too thin for LightStanza to import correctly. Adjust the thickness by clicking the down arrow at its center — in our tests, two clicks is usually sufficient:


  5. Finally, you can load your changes into your model by clicking “Load into Project and Close” in the Family Editor section of the top menu:


  6. You will be given the option to save the changes you made as a new Revit family file. The last step is to overwrite the TDDs currently in your model. Click the second option, to overwrite both the existing family version and its parameter values:


  7. Repeat the steps above for any other TDD families in your model. When you import into LightStanza, you can paint just the diffuser polygons with the TDD BSDF of your choice.
In Rhino
  1. In your 3D model, place the diffusing polygons inside BELOW the ceiling at least 1/2 inch. Make sure that there are no openings on the roof above the TDD polygons so that they are fully excluded from the sun. Please see Figure 1 above.
    1. Model the diffusing polygons so that they will be recognized by lightstanza as glass — see the Rhino windows section above.
    2. Make sure that the TDD polygons are the dimensions specified by the manufacturer. For Acuity Brands’ Sunoptics® LightFlex™ Tubular Daylighting Systems, please use 24″x24″ openings that are fully excluded from the sun.
  2. After you have saved your model and uploaded it to LightStanza, you can apply TDD materials to your TDD polygons. Click the Materials tab in the left toolbar, then click on either “Product Library” to use one of our manufacturing partners’ TDDs, or click “Uploaded BSDF Library” to upload your own TDD BSDF file. Apply the desired material(s) to the TDD polygons using the paint bucket. Paint ONLY the (outer) diffusing polygon with the TDD material. Only 1 polygon should be painted the TDD material. Please see Figure 1 above.
  3. Do not paint any other part of the TDD, including the inside or outside of its tube, or any part of the collector on the roof. LightStanza applies an accurate BSDF to the diffuser (step 2) only. Please see Figure 1 above.

Generating Results in LightStanza

The Activity Bar (on the right side of your design screen) is where new activities are started, previous activities are referenced, model edits are listed, and comparison reports are kicked off..
    1. Renderings/Animations – These come in the form of individual point-in-time renderings and animations. To play a rendering animation, click the New Simulation button in the top of the activity menu.
      1. Camera Tools – You can customize the way you view your renderings in the 3D viewer with Camera Tools. (Hover over the activity you want to see in the activity menu then click the building icon )
        1. Exposure – You can manually adjust the exposure of your renderings in order to increase or decrease the amount of light per unit area. LightStanza uses Reinhard tone mapping for adjusting exposure.
        2. Contrast – Adjusting the contrast of your image will increase or decrease the difference between light and dark in your renderings.
        3. False Color – In the 3D viewer, you have the option to view your renderings in False Color mode for a more quantitative view of your images.
          1. Luminance Bounds – Changing your luminance sets what luminance values each color in your image represents. Adjust this to focus on very bright or very dark areas.
          2. Log Scale – Adjusting your log scale sets scaling of your false color heat map.
        4. Contour Lines – This is another way to look at your false color rendering. Contour lines trace the different luminance thresholds in your rendering, using the false color legend.
          1. Line Spacing – Changing your line spacing sets the density of the contour lines in your image.
      2. Daylight Glare Probability scores will appear in the top bar with your hemispheric lens renderings. Daylight Glare Probability (DGP) is the “percentage of people disturbed” due to the level of vertical eye illuminance at the viewpoint being simulated. These are some guidelines to follow when analyzing DGP values:
        1. 0-35% Imperceptible, 35-40% Perceptible, 40-45% Disturbing, 45-100% Intolerable
    2. Illuminance Grids – These come in the form of Point-in-time Illuminance Grids and animations. Clicking one of these activity cards will place the results inside of your 3D model.
    3. Annual Illuminance Grids – These come in the form of Annual Sunlight Exposure (ASE), Spatial Daylight Autonomy (sDA), Continuous Daylight Autonomy (cDA), Daylight Autonomy (DA), Useful Daylight Illuminance (UDI), and Average Illuminance. Clicking one of these activity cards will place the results inside of your 3D model.
    4. LEED Scorecard – These come in the form of LEED v4 and LEED 2009 Scorecards. Clicking on one of these activity cards will place select results in the 3D viewer.
      1. Clicking on a LEED v4 Option 1 & 2 Scorecard will automatically place your ASE scores in the 3D viewer. Click “View Report” to see all analysis types (Option 1 ASE & sDA; Option 2 9am & 3pm).
      2. Clicking on a LEED v4 Option 1 will automatically place your ASE scores in the 3D viewer. Click “View Report” to see all analysis types (Option 1 ASE & sDA).
      3. Clicking on a LEED v4 Option 2 Scorecard will automatically place your 9am scores in the 3D viewer. Click “View Report” to see all analysis types (Option 2 9am & 3pm).
      4. Clicking on LEED 2009 Scorecard will automatically place your September 21st 9am scores in the 3D viewer. Click “View Report” to see all analysis types (September 21st 9am & 3pm).
    5. Viewing model edits – By clicking the “Show model edits” button at the top of the Activity Bar, you can see any edits you’ve made to your model in the left toolbar. You can also revert to previous model states using the revert button on a history card, and you can save any state of your design to a new design using the save button on a history card.
    6. Starting a comparison – By clicking the “Compare activities” button at the top of the Activity Bar, you can compare two different simulations at once by selecting two activities from the list of simulations below.
    7. Starting a new activity – At the top of the Activity Bar, there is a “New” dropdown menu with the following options:
      1. Rendering/Animation – Renderings can be made on the fly or from your list of viewpoints in the left Viewpoints panel. To make renderings on the fly, simply move your 3D viewer screen to the angle and location that you want, and when you start a new rendering it will make an image at that exact spot. After clicking “Rendering/Animation” in the dropdown menu, you will be presented with a new set of simulation options:
        1. Date and Time – Renderings will be created at each combination of the hours, months, and days selected here:
          1. Switch between measuring a single point-in-time or multiple by checking the “Multiple Times” box at the top of the “Date and Time” dropdown settings.
          2. Use the bar slider to select the time(s) that will be calculated during the render. You have the option to select single or multiple months/days to test during your render.
          3. You also have the option to use Preset Date options: 1, 3, 4, 12. These Presets will choose either the month(s) of September, June/September/December, March/June/September/December, or all 12 Months. When using the preset options for Date and Time, you still have full control of the days within these months to test.
        2. Sky Conditions – You can choose between 3 different sky types:
          1. Clear uses a sky without clouds.
          2. Climate uses weather data dependent on your settings in the “site” tab on the left-hand side of the 3D viewer.
          3. Overcast uses a sky with full cloud coverage.
        3. Use Blinds – Selecting “Use Blinds” means that you would like to see blinds operating in your rendering images. You can set more advanced blind settings/options in the blinds tab in the left Model Settings toolbar.
        4. Simulation Quality depends on a list of Radiance settings. These settings will be shown as a tooltip next to the Simulation Quality setting header.
          1. “Draft” quality is good for faster simulation in early design stages
          2. “High” and “Very High” quality renderings will be more accurate for things like reports.
          3. You also have the option to set “Custom” quality settings. Simply click “Show Quality Details” and edit your Radiance parameters directly. You can hide these details by clicking “Hide Quality Details.” To go back to a default quality setting, click between “Draft,” “High,” or “Very High” from the “Quality” list. For more information on these details, visit Rendering Options (outdated Version 2.4) and Rpict documentation.
        5. Camera Settings – Adjust Camera settings to determine quality of renderings.
          1. Lens
            1. Perspective lens – Renderings that resemble the way the human eye would see a space.
            2. Hemispheric lens – Renderings with a wide angle (similar to a fisheye lens). Hemispheric lenses are recommended for viewing accurate Daylight Glare Probability scores, and will automatically display your DGP score on the top toolbar in the 3D viewer.
            3. Cylindrical lens – Renderings with a panoramic look.
          2. Field of View – Adjusting field of view will change X and Y lens angles. Different lenses (above) will have different default angles. The maximun value for X or Y is 180 degrees for hemispheric and cylindrical lenses, and 175 degrees for perspective lenses.
          3. Super Sampling – Super Sampling has to do with the original size of your renderings before scaling to your target resolution. The larger this percentage, the crisper your images will be. For speed, please choose smaller percentages.
          4. Resolution changes the quality, in pixels, of your rendering.

            These images show the differences that a viewpoint’s settings can make for overall quality and accuracy. On the left is a rendering simulated at Draft quality with 1 ambient bounce, 100% super sampling, and 512x512px resolution. In comparison, the image on the right was simulated at Very High quality, 7 ambient bounces, 500% super sampling, and 4000x4000px resolution.

          5. Section Cut – By simulating with a section cut, you can cut into your 3D model to easily view daylight performance in your building. Although walls will appear to be missing, lighting levels will stay the same as if there was no section cut. You have the option to adjust Fore and Aft section cut distances; Fore is the near plane and Aft is the far plane in your section cut. An Aft plane can cut out the bright light of the sky or ground.
          6. Analysis Viewpoint – Choose which viewpoints to analyze during the rendering.
            1. Current – This is render an analysis in the current viewpoint in the 3D model viewer.
            2. All Active – All Active will perform an analysis on all viewpoints that are checked “on” in th eleft panel within the 3D model space.
      2. Grid Illuminance – After clicking “Grid Illuminance” in the “New Simulation” dropdown menu, you will be presented with a list of simulation options:
        1. Date and Time – Results will be created at each combination of the hours, months, and days selected here:
          1. Switch between measuring a single point-in-time or multiple by checking the “Multiple Times” box at the top of the “Date and Time” dropdown settings.
          2. Use the bar slider to select the time(s) that will be calculated during the render. You have the option to select single or multiple months/days to test during your render.
          3. You also have the option to use Preset Date options: 1, 3, 4, 12. These Presets will choose either the month(s) of September, June/September/December, March/June/September/December, or all 12 Months. When using the preset options for Date and Time, you still have full control of the days within these months to simulate.
        2. Sky Conditions – You can choose between 3 different sky types:
          1. Clear uses a sky without clouds.
          2. Climate uses weather data dependent on your settings in the “site” tab on the left-hand side of the 3D viewer.
          3. Overcast uses a sky with full cloud coverage.
        3. Use Blinds – Selecting “Use Blinds” means that you would like to see the effect of blinds operating in your results. You can set more advanced blind settings/options in the blinds tab in the left Model Settings toolbar.
        4. Grid Settings
          1. Point Spacing – Point spacing is the density of your illuminance grid points. Smaller grid spacing will give more detail, but take longer to compute.
          2. Scale – You have the option to select one of two scales to measure your illuminance grid.
            1. 0 – 3,000+ lux
            2. 0 – 5,000+ lux
        5. Simulation Quality – Quality depends on a list of radiance settings. These settings will be shown as tooltip text next to the Quality setting header.
          1. “Draft” quality is good for faster simulations in early design stages.
          2. “High” and “Very High” quality illuminance grids will be more accurate for things like reports.
          3. You also have the option to set “Custom” quality settings. Simply click “Show Quality Details” and edit your Radiance parameters directly. You can hide these details by clicking “Hide Quality Details.” To go back to a default quality setting, click between “Draft,” “High,” or “Very High” from the “Quality” list. For more information on these details, visit Rtrace Documentation.

            The images above show the same illuminance grid simulated at draft quality (left), high quality (middle), and very high quality (right). Higher quality results show more light (ambient bounces) entering the space with increased uniformity among grid points.

      3. Annual Grid Illuminance allows you to generate illuminance grids throughout the entire year. Your simulation options include the following:
        1. Metrics – Annual Analysis types (multiple types can be calculated simultaneously):
          1. Annual Sunlight Exposure (ASE)
          2. Spatial Daylight Autonomy (sDA)
          3. Spatial Daylight Saturation (sDS)
          4. Average Illuminance
          5. Continuous Daylight Autonomy (cDA)
          6. Daylight Autonomy (DA)
          7. Useful Daylight Illuminance (UDI)For more information about each type, click here. For more information about Spatial Daylight Autonomy specifically, check out the sDA series.
        2. Period and Occupancy – Period and Occupancy determine the date range over which the simulations will be performed as well as the daily time range for your calculatinos. You can choose to either use a settable daily range (i.e. 8am – 6pm every day), or you can choose “European Standard EN17037”. “European Standard EN17037” uses the 50% of the daylight hours in a year with the highest horizontal illuminance values (base on climate data) for occupancy. Choosing “European Standard EN17037” is required for European Standard EN17037 compliance.
        3. Sky Conditions – You can choose between 3 different sky types:
          1. Climate uses weather data dependent on your settings in the “site” tab on the left-hand side of the 3D viewer.
          2. Clear uses a sky without clouds.
          3. Overcast uses a sky with full cloud coverage.
        4. Use Blinds – Selecting “Use Blinds” means that you would like to see the effect of blinds operating in your results. You can set more advanced blind settings/options in the blinds tab in the left Model Settings toolbar.
        5. Grid Settings – These settings allow you to adjust the illuminance grid(s) that are to be measured.
          1. Point Spacing is the density of your illuminance grid points. Smaller point spacing will give more detail, but take longer to compute, and vice versa.
          2. Color Scheme: By default, annual results will have a different color shceme for each metric, typically shades of a single color. If “Heat Map” is selected, all metrics will use a blue-to-red gradient. When time thresholds are used, values below the threshold will appear in grayscale (except for ASE).
        6. Thresholds
          1. Illuminance Target should be adjusted depending on the type of space you are analyzing.
          2. sDA/sDS/UDI Time Threshold represents of the minimum percentage of time your space should meet or exceed the target illuminance (above). THis number should be 50% for LEEDv4 credit.
        7. Simulation Quality depends on a list of radiance settings. These settings will be shown as tooltip text next to the Quality setting header.
          1. “Draft” quality is good for faster simulations in early design stages.
          2. “High” and “Very High” quality illuminance grids will be more accurate for things like reports.
          3. You also have the option to set “Custom” quality settings. Simply click “Show Quality Details” and edit your Radiance parameters directly. You can hide these details by clicking “Hide Quality Details.” To go back to a default quality setting, click between “Draft,” “High,” or “Very High” from the “Quality” list.
        8. Downloadable annual illumination/blinds schedule in csv format. This option allows you to generate downloadable csv files for your annual simulation. Once your simulation is complete, you can access these csv. files by opening the report and clicking the download button. Please note that annual csv. files are very much larger
        9. For groups with blinds or dynamic glass, the option “use grid-point pre-filtering” (under optimization) speeds up the simulation process by replacing illuminance grid points that are unlikely to be illuminated by each window group. They are replaced by simple geometric methods. Note that it many cause window groups to be missed in models with unique layouts.
      4. Glare Analysis – After selecting “Glare Analysis” in the “New Simulation” drop-down menu, you will be presented with 3 different glare analysis types, with their associated settings:
        1. DGP Rendering – This option will create a rendering/animation as well as calculate Daylight Glare Probabilities
          1. Date and Time – Renderings will be created at each combination of the hours, months, and days selected here:
            1. Switch between measuring a single point-in-time or multiple by checking the “Multiple Times” box at the top of the “Date and Time” dropdown settings.
            2. Use the bar slider to select the time(s) that will be calculated during the render. You have the option to select single or multiple months/days to test during your render.
            3. You also have the option to use Preset Date options: 1, 3, 4, 12. These Presets will choose either the month(s) of September, June/September/December, March/June/September/December, or all 12 Months. When using the preset options for Date and Time, you still have full control of the dates within these months to test.
          2. Sky Conditions – You can choose between 3 different sky types:
            1. Climate uses weather data dependent on your settings in the “site” tab on the left-hand side of the 3D viewer.
            2. Clear uses a sky without clouds.
            3. Overcast uses a sky with full cloud coverage.
          3. Blinds – Selecting “Use Blinds” means that you would like to make blinds operate for your analysis. You can set more advanced blind settings/options in the blinds tab in the left Model Settings toolbar.
          4. Simulation Quality – Quality depends on a list of radiance settings. These settings will be shown as tooltip text next to the Quality setting header.
            1. “Draft” quality is good for faster simulations in early design stages.
            2. “High” and “Very High” quality illuminance grids will be more accurate for things like reports.
            3. You also have the option to set “Custom” quality settings. Simply click “Show Quality Details” and edit your Radiance parameters directly. You can hide these details by clicking “Hide Quality Details.” To go back to a default quality setting, click between “Draft,” “High,” or “Very High” from the “Quality” list.
          5. Camera Settings – These settings allow you to adjust several options for your rendering/animation.
            1. Field of View – Adjusting these settings will change the X and Y lens angles. Both the X and Y default angles are 180.
            2. Super Sampling – Setting this percentage determines the original size before scaling to your target resolution. The larger this percentage, the crispier your images will be.
            3. Resolution – Adjusting the resolution will change the quality, in pixels, of your renderings.
            4. Section Cut – By simulating with a section cut, you can cut into your 3D model to easily view daylight perfomance in your building.
            5. Analysis Viewpoint – The analysis will be performed at the selected viewpoint.
        2. Glare Chart – This simulation will create a chart showing the daylight glare probability at the selected times from the selected analysis viewpoint. This analysis is typically meant to be performed from a viewpoint inside your design.
          1. Period and Occupancy – Adjust dates and time interval of when to run simulation. Choose custom start/end times or use the “Sunrise – Sunset” option. To adjust Day and Hour intervals to measure, change Glare Method from DGPs to DGP.
          2. Glare Method – There are two types of Total Glare analyses:
            1. Daylight Glare Probability (DGP) makes a rendering at every time step and then analyzes that rendering for glare. This takes longer than the Simplified Daylight Glare Probability (DGPs) but will account for more detail.
            2. Simplified Daylight Glare Probability (DGPs) measures vertical illuminance at every time step using annual data, and then estimates glare based on that value. This is significantly faster than DGP, but it is less accurate and not as sensitive to small sources of glare.
          3. Sky Conditions – You can choose between 3 different sky types:
            1. Climate uses weather data dependent on your settings in the “site” tab on the left-hand side of the 3D viewer.
            2. Clear uses a sky without clouds.
            3. Overcast uses a sky with full cloud coverage.
          4. Blinds – Selecting “Use Blinds” means that you would like to see the effect of blinds on your results. You can set more advanced blind settings/options in the blinds tab in the left Model Settings toolbar.
        3. Glare Finder – Glare Finder measures entire spaces in your model for “glare hotspots” using annual calculations and sDGP estimations. Your results will include a rendering filmstrip at the glare hotspot. The filmstrip will show the direction and DGP of the worst glare throughout the most problematic day within the period and occupancy of interest.
          1. Finder Settings – Choose the space (defined by an illuminance grid) to analyze, as well as the height above the floor and the point spacing to search for glare.
          2. Period and Occupancy – Adjust the dates and time intervals to search for glare. Choose custom start/end times or use the “Sunrise – Sunset” option.
          3. Sky Conditions – You can choose between 3 different sky types:
            1. Climate uses weather data dependent on your settings in the “site” tab on the left-hand side of the 3D viewer.
            2. Clear uses a sky without clouds.
            3. Overcast uses a sky with full cloud coverage.
          4. Blinds – Selecting “Use Blinds” means that you would like see the effect of blinds operating in your results. You can set more advanced blind settings/options in the blinds tab in the left Model Settings toolbar.
      5. LEED Scorecard
        1. LEED Scorecard Type
          1. LEED v4 Options 1 & 2 – Lightstanza generates a full LEED v4 NC EQc7 Daylight Credit Report with both Options 1 & 2 for you to choose the option that achieves the most daylight credit points. This scorecard is kept up-to-date with the latest USGBC addendum. When viewing your scorecard, you will have the option to display scores for both v4.0 and v4.1. It is important to utilize the small black info icons (  ) throughout, which give detailed explanations of the different elements of the report when hovering over them. To learn more about the different elements of the LightStanza LEED v4 report card, click here. You can also simulate the two options separately in order to focus on a specific option and save simulation time.
          2. LEED 2009 – This version of LEED is still accepted for specific projects. For more information about the LEED 2009 Daylight Credit, click here. You can also find information about the different LEED daylight credit options at the LightStanza References page.
        2. Blinds – Selecting “Use Blinds” means that you would like see the effect of blinds operating in your results. You can set more advanced blind settings/options in the blinds tab in the left Model Settings toolbar.
        3. Grid Settings – Point Spacing is the density of your illuminance grid points. Smaller point spacing will give you more detail, but will take longer to compute. Point spacing that is larger than 2ft is not accepted by the USGBC for LEED credit.
        4. Location: This is where your 3D model is located. You can modify location in the ‘Site’ tab in the left toolbar. You can modify default location in your Account Preferences
        5. Climate Station: This is the weather data that will be used for your simulation. You can modify weather in data in the ‘Site’ tab in the left toolbar.
        6. Downloadable annual illumination/blinds schedule in csv format. This option allows you to generate downloadable csv files for your annual simulation. Once your simulation is complete, you can access these csv files by opening the report and clicking the download button. Please note that annual csv files are very large.
      6. Daylight Factor – Daylight Factor grid point percentages represent the ratio of indoor to outdoor illuminance levels on an overcast day.
        1. Grid Settings – Point spacing is the density of your illuminance grid points. Smaller point spacing will give more detail, but take longer to compute, and vice versa.
        2. Quality depends on a list of radiance settings. These settings will be shown as tooltip text next to the Quality setting header.
          1. “Draft” quality is good for faster simulations in early design stages.
          2. “High” and “Very High” quality illuminance grids will be more accurate for things like reports.
          3. You also have the option to set “Custom” quality settings. Simply click “Show Quality Details” and edit your Radiance parameters directly. You can hide these details by clicking “Hide Quality Details.” To go back to a default quality setting, click between “Draft,” “High,” or “Very High” from the “Quality” list. For more information on these details, visit Rtrace Documentation.
        3. Threshold – Turn “Use DF Threshold” on to enter the target Daylight Factor score for each grid point, and color-code the results to easily see where the target is met.
        4. Location: This is where your 3D model is located. You can modify location in the ‘Site’ tab in the left toolbar. You can modify default location in your Account Preferences
      7. Total Energy Map – A Total Energy Map uses a cumulative (total) sky to generate a false color image that shows how much solar energy falls on your model within a specified period. After clicking “Total Energy Map” in the dropdown menu, you will be presented with a new set of simulation options:
        1. Period and Occupancy – Period is the length of time that the energy map will represent. Adjust the sliders or click on the dates and use the calendar widgets to set the date range you would like your total energy map to represent. Occupancy is the daily time range that your energy map represents.
        2. Sky Conditions – You can choose between 3 different sky types:
          1. Climate uses weather data dependent on your settings in the “site” tab on the left-hand side of the 3D viewer.
          2. Clear uses a sky without clouds.
          3. Overcast uses a sky with full cloud coverage.
        3. Simulation Quality – Quality depends on a list of radiance settings. These settings will be shown as tooltip text next to the Quality setting header.
          1. “Draft” quality is good for faster simulations in early design stages.
          2. “High” and “Very High” quality illuminance grids will be more accurate for things like reports.
          3. You also have the option to set “Custom” quality settings. Simply click “Show Quality Details” and edit your Radiance parameters directly. You can hide these details by clicking “Hide Quality Details.” To go back to a default quality setting, click between “Draft,” “High,” or “Very High” from the “Quality” list. For more information on these details, visit Rtrace Documentation.
        4. Camera Settings
          1. Lens
            1. Perspective lens resembles the way the human eye would see a space.
            2. Hemispheric lens uses a wide angle similar to a fisheye lens.
            3. Cylindrical lens has a panoramic look.
          2. Field of View – Adjusting field of view will change X and Y lens angles. Different lenses (above) will have different default angles. The minimum value for X or Y is 1°. The maximum value for X or Y is 180° for hemispheric and cylindrical lenses, and 175° for perspective lens.
          3. Super Sampling has to do with the original size of your images before scaling to your target resolution. The larger this percentage, the crisper your images will be. For speed, choose smaller percentages.
          4. Resolution changes the quality, in pixels, of your total energy map.
        5. Advanced Settings – Opaque Glass – By checking “Opaque Glass” you can simulate total energy performance on the exterior side of your model’s windows or any other transparent surface, but you will not be able to measure total energy on the inside of your model. By unchecking “Opaque Glass” you will not be able to see total energy performance on the surface of your windows or glass, but you will be able to measure total energy on the inside of your model.
        6. Analysis Viewpoint is the viewpoint that your total energy map will be generated from. An exterior viewpoint is recommended.
          1. To make an Total Energy Map from your current viewpoint (“Current” from the dropdown list), simply move your 3D viewer screen to the angle and location that you want, and when you start a new simulation it will make an image at that exact spot.
        7. Climate Station: This is the weather data that will be used for your simulation. You can modify weather in data in the ‘Site’ tab in the left toolbar.
        8. Location: This is where your 3D model is located. You can modify location in the ‘Site’ tab in the left toolbar. You can modify default location in your Account Preferences
      8. Navigating Activity Panel Tools – The top of the Activity panel holds several buttons to compare, view, and edit your model.

      1. Compare Activities – This button allows you to compare two seperate 2D reports of simulations that have been run.
      2. Intelligent Perspective/Section Cut – This button will allow you to toggle Smart Camera Position and Smart Section Cut on and off for easily viewing grid-based simulation results within your 3D model.
      3. Revert Model to Previous State – When selecting this button you will be prompted to select a model state to revert to represented by history cards in the Activity Panel. Once you revert to a previous model state, this action cannot be undone.
      4. Make a Copy of Your Design – This button will create a new copy of your model in its current state in the 3D viewer (so if you are viewing a previous state in the model history, the copy will have the properties of that previous state). After selecting this button you will be prompted to name your new design before continuing.
      5. Show/Hide Simulation Results or Model Edits – Here you can show/hide cards in the Activity Panel that represent Simulation Results and/or Model Edits.
      6. Filter Activites – This button will allow you to filter cards in the Activity Panel strictly by the Simulation Type.
      7. Viewing previous activities – Each card in the activity bar is an individual activity. The cards consist of a few basic navigational elements.