I have a question about Annual DGP within Diva 4 for Rhino.
In its definition, ''annual DGP is estimated for each hour in the year by using an annual DAYSIM prediction to calculate vertical eye illuminance and images with the ambient calculation turned off to predict contrast from direct sunlight''.
However, I see that I can control the value of ambient bounces within DIVA settings to make it higher. So, is this suggestion (with ambient bounces=0) made only to speed up the simulation?
The ambient parameters you input are used for the vertical eye illuminance component of the calculation, so its recommended to set them appropriately high. The direct sunlight renderings always use -ab 0 regardless of your ambient inputs.