Merge pull request #19623 from sciecode/dev-cubeuv-refraction

WebGLProgram: support cube uv refraction mapping

src/renderers/webgl/WebGLProgram.js

@@ -344,6 +344,8 @@ function generateEnvMapModeDefine( parameters ) {
 
 			case CubeRefractionMapping:
 			case EquirectangularRefractionMapping:
+			case CubeUVRefractionMapping:
+
 				envMapModeDefine = 'ENVMAP_MODE_REFRACTION';
 				break;