| ray | The ray in global coordinates |
| localRay | The ray in local coordinates |
| tmin | The beginning of the segment |
| tmax | The end of the segment |
| inOutColor | On input, the color of the point behind the ray. On ouput the color of the light once filtered through the volume |
| raytracer | A pointer to the raytracer used for the lighting |
| instance | The instance of the volume primitive |
| instanceNb | A id in the raytraced grid for the hit instance (can be different with same instance in replicators) |
| isShadowRay | True if the ray is a shadow ray. |
| isIndirectRay | True if the ray has already hit a reflective or semi transparent surface |