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This page provides information on the Volumetric Grid as implemented in V-Ray for Houdini.

Overview

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:

  • V-Ray Volume Grid Cache – Reads and visualizes volumetric cache data (.aur, .vdb. and .f3d). Contains controls related to how volumetric geometry is loaded during rendering.
  • VolumeGrid Shader – Controls the rendering and shading properties for the volumetric cache. In addition to volumetric rendering, this node provides options for isosurface rendering and meshing.

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.

 

Setting up the Volume Grid

To set up the V-Ray Volume Grid, perform the following steps:

  1. Create a Geometry node with a V-Ray Volume Grid Cache node inside it.
  2. Create a shop network with a V-Ray Material node. Inside the V-Ray Material context, create a VolumeGrid Shader and connect it to the output node.



  3. Select the Geometry node with the Phoenix Shader Cache, and in the Render tab, connect the V-Ray Material with the Phoenix Shader Sim in the Material input.