This page provides information on the Volumetric Grid as implemented in V-Ray for Houdini.
The V-Ray Volumetric Grid is a special kind of volumetric effect that works with grid-based cache formats. Compare with Environment Fog, which is a general purpose volumetric shader.
The Volumetric Grid requires two nodes:
This two-node setup allows users to export native Houdini volumes and render them with V-Ray using the V-Ray Volume Grid.
Currently there are compatibility issues with Volume Rendering on macOS and Linux operating systems. This will be resolved as soon as possible.
To set up the V-Ray Volume Grid, perform the following steps:
1. Create a Geometry node with a volume object (such as V-Ray Volume Grid Cache node, VDB through File SOP, or Volumetric Geometry) inside it.
2. Create a mat network with a V-Ray Material Builder node. Inside the V-Ray Material Builder context, create a VolumeGrid Shader and connect it to the Output node.
3. Select the Geometry node and in the Render tab, connect the V-Ray Material Builder with the VolumeGrid Shader in the Material input.
If you want to apply V-Ray VolumeGrid Shader with a Material SOP, you must first pack the volume object with a Pack SOP.