We have some renders of multi channel exrs that are a collection of commonly used utility passes (AO, UVs, Normals, etc.) that I would love to be able to mix bit depth on, so some layers are full float and some are half.
I see that as of 184.108.40.206, Arnold supports this through:
Half-float EXR layers: Output layers in files that support layers (such as regular or deep EXR files) can be individually set to type HALF by adding an optional HALF modifier to the corresponding output string. For instance: "my_aov RGB filter driver HALF". (#3839)
Is there more detail available on how to actually do this through mtoa? I don't really understand what that means.