Two-pass improves image quality with ambient cache

radiance-general
1

Hi all,
I have experienced that calculating the same image (same resolution) two times with the ambient cache one gets smoother results.

I know about ‘overture’ calculation but this might be different (?)

Thank you for your help.

2

That is overture calculation. Radiance is able to interpolate between ambient values that are already in the cache, resulting in a smoother image.

The advantage to rendering the first (“overture”) pass at a smaller resolution is that it takes less time, as the goal of the first pass is only to populate the ambient cache, and not to render the details.

Nathaniel