message: Add defines for direct-volume
diff: @@ -62,6 +62,12 @@ uniform int uGroupCount;
  uniform sampler2D tMarker;
  #endif
  +#if defined(dRenderVariant_colorDpoit)
  + #define MAX_DPOIT_DEPTH 99999.0
  + uniform sampler2D tDpoitDepth;
  + uniform sampler2D tDpoitFrontColor;
  +#endif
  +
  uniform float uMetalness;
  uniform float uRoughness;
  