[MtoA] cross-platform volume file names


The Arnold volume node uses the texture search path, so you don’t have to use an absolute path in the volume filename.

volume_texture_searchpath

So if you need to set up a Maya scene so that the OpenVDB volumes work on any platform, you could put an environment variable in the Texture Search Path

volume_env_var

Just note that support for volume filenames is still a little … rough. You can’t enter an absolute path in the aiVolume Filename box, then enter a texture search path, and expect MtoA to automatically export a relative path.┬áThat still needs to be implemented.

For now, here’s what to do:

  • When you first create the volume, load the vdb file and leave the full absolute path in the aiVolume Filename box.
  • Select the grids and set the other volume parameters.
  • Then set the texture search path and strip off the path from the volume file name (leaving just the file name).
  • Now the environment variable will control where Arnold looks for the vdb file.

The Arnold volume node also support environment variables, so you could do this:

volume_env_var_in_filename

But again, once you put the environment variable into the Filename, the path won’t be resolved inside Maya (but it will work when you render).