Arnold Implicit Surface field modification in shader

[Anonymous]

Hello,
is it possible to modify values of Field Channel in shader when rendering Arnold Implicit Surface node?

So I am rendering VDB with SDF volume grid, but in shader I seem to be able to manipulate only surface shading. I would like to manipulate (or even generate if possible) this SDF field.

Example workflow could be: sample SDF grid with Volume Sample Float set to SDF mode, process the value and output to the renderer for rendering as a surface.

Also I have one side question: are there any examples of Arnold API on how to write procedurals for Arnold Implicit Surface? There is an option Custom in ar_volume_type parameter which I assume can be used for that. I would like to pass distance values through API to the renderer and let Arnold to determine the surface and shading. Any suggestions or directions will be appreciated 🙂

Best,
Juraj