Question: why every time the simulation results is not the same?

Thanks for the amazing work of Mostapha. But I find a question. Every time i run the daylight simulation, the results are different. For example, in the attached file, the average DF is 3.18% , but the value may be 3.17% next time. The question troubles me. Do you seen the problem? And who can tell me the reason. Thanks. (448 KB)

Daylight simulation is stochastic. For every data point, Radiance throws out n rays in random directions, and running the same simulation multiple times means that different rays are fired. So a small deviation is normal.

thanks James