[Radiance-general] texfunc with -aa 0

[Greg Ward]

Hi Stephen,

A texfunc perturbs the surface normal, which should be visible at least in directly lit areas with -ab 0.  Are you saying that you have directly lit surfaces that look flat with a texfunc applied?  That would be unexpected.

In the shadows, there is nothing for a perturbation in the surface normal to affect, so everything looks the same as it would without the texfunc.  With -ab 1, you see variation again, as the surface normal influences the shading of the indirect component.

-Greg

> From: Stephen Wasilewski <stephen at coolshadow.com>
> Date: October 31, 2016 4:08:52 PM PDT
> 
> Does anyone know why a texfunc has no effect on the material it modifies with -aa 0?  The same material/geometry/octree appear as expected with -aa > 0.
> 
> Thanks,
>  
> Stephen Wasilewski
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