Hi ,

I’m trying to improve the results from the method:

`TextureEvaluator.GetColor( Point3d uvw, Vector3d duvwdx, Vector3d duvwdy )`

So I assumed using the `duvwdx, duvwdy`

ray differential parameters might help.

However, I have no idea how to construct these vectors. I tried to follow the documentation and reference Pharr Humphreys, “Physically Based Rendering”, chapter 11. (Chapter 10.1.1 in the version I found. pg. 601.)

But… it’s a bit over my head. From what I can gather these two vectors `duvwdx`

, `duvwdy`

are *x,y* offsets (one pixel sample?) in the a tangent plane of the first parameter `uvw`

?

Any thoughts @nathanletwory? I noticed you had a code comment about using these parameters in the overridden method of GetColor you posted here.

Any help would be much appreciated, I’m pretty new to this area of the API.