Returns the value of a scalar channel from a Bifröst object. You can connect the Out Value port to drive an input port of another shader.
To echo a list of voxel channels that are defined on a Bifröst object to the Script Editor, run the following MEL command:
getAttr objectname.availableVoxelChannels;
To echo a list of particle channels, run this:
getAttr objectname.availableParticleChannels;