ConservativeDensity

This is a 3-components float vector. The X component must represent the participating medium conservative density. This is used to accelerate the ray marching by early skipping expensive material evaluation. For example, a simple top down 2D density texture would be enough to help by not evaluating the material in empty regions. The Y and Z components can contain parameters that can be recovered during the material evaluation using the VolumetricAdvancedMaterialInput node. Evaluated per sample.