Merge branch 'main' of github.com:gkjohnson/three-shader-pathtracing into main

Author: gkjohnson

CHANGELOG.md

@@ -10,6 +10,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Support for vertex colors.
 - Support for attenuated transmission.
 - PathTracingRenderer.alpha: Docs specifying premuliplied alpha behavior.
+- Support for thin film transmission.
 
 ### Fixed
 - Diffuse materials looking too dark.

README.md

@@ -681,6 +681,9 @@ Updates the size and values of the texture to align with the provided set of mat
 
 The "matte" and "side" values must be updated explicitly.
 
+> **Note**
+> In order for volume transmission to work the "attenuationDistance" must be set to a value less than Infinity or "thickness" must be set to a value greater than 0.
+
 ## LightsInfoUniformStruct
 
 Helper uniform for encoding lights as texture data with count.