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Why do my results change slightly between simulations?  

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Radiance  uses “stochastic” methods with inherent randomness that causes variations between simulations. This is a feature, not a bug! Without these methods, simulations would take far too long to be of any use.

 

These variations can be particularly apparent for metrics that bin data (e.g. the 50% of daylight hours above 300 lux for sDA calculations). Values very near cutoffs can fluctuate between bins between simulations - e.g. 49.6% of hours vs 50.2% of hours for a point in an sDA score.

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