The answer to this question appears to be chapter 7 of Ray Tracing Gems II.

In the context of ray-tracing the correct search-terms are "ray differentials" and "ray cones".

#raytracing #texture #uvmaps

Julien's series of articles on UVs is now fully published - dig in!
#b3d #BlenderStudio #3danimation #modeling #uvmaps
https://studio.blender.org/blog/a-uv-unwrapping-guide/
A UV Unwrapping Guide - Blender Studio

A collection of advice for general use of UV maps in texturing.

Blender Studio

Still crazy about UVs? To wrap Julien's series on the topic, get specific tips on avoiding subdivision issues on UV maps.
#b3d #BlenderStudio #uvmaps #surfacing #animation

https://studio.blender.org/blog/working-with-uv-smoothing/

Working with UV Smoothing - Blender Studio

Specific tips on avoiding subdivision issues on UV maps.

Blender Studio

Crazy about the UV grids? Learn more about packing, grouping and iterating over UV maps with our in-house map-man, Julien.

#b3d #BlenderStudio #uvmaps #animation #surfacing

https://studio.blender.org/blog/packing-uv-maps/

Packing UV Maps for Production - Blender Studio

Some insight into packing, grouping and iterating over UV maps in our films.

Blender Studio