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Why does the resolution change for each pass for the irradiance map? It starts off with the lowest resolution and the works up the highest. Why does it not just stay at the same resolution for each pass? Does it pick up better samples at a higher resolution that are missed form the lower resolution passes?
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It's adaptive - the lowest quality pass is so it can work out where all of the flat, boring areas of the scene are in terms of angles between faces (the irmap normal threshold) and colour values (ze colour threshold) and for the simple areas that it can undersample it will. For anything above your set thresholds, vray goes up to the next level of quality, does a refinement pass and again cuts off on anything it considers "boring". It's in a way doing something similar to bruteforce in that it does hemispherical sampling for the surfaces it calculates bounce light for. The main speed increase comes with the fact that it's doing this sampling for a lower resoltion render first, working out where needs more work and only doing those more important bits for the next level of resolution and so on until you reach your final image. -
Yeah makes sense. Thanks.Comment
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