getraylevel VEX function
Returns the depth of the ray tree for the current shading.
Returns the depth of the ray tree for the current shading. If the returned value is 0, this represents a ray from the camera to the scene. If the ray level is 1, the ray represents either a reflection/refraction ray. If the level is 2, then this represents a reflection/refraction which appears in a previous reflection/refraction etc.