Custom AOVs for Volume Shaders
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| No Emission | Custom 'temperature' AOV mask | Beauty |
The aov_write_rgb, aov_write_float, and aov_write_rgba shader nodes can now be used in volume shader networks to write custom AOVs, just as they already work for surface shaders. Both flat (EXR, TIFF) and deep EXR outputs are supported.
Custom AOVs for volume shaders
The aov_write_rgb, aov_write_float, and aov_write_rgba shader nodes can now be used in volume shader networks, just as they already work for surface shaders. Previously, custom AOVs were silently ignored in volume contexts. The volume raymarcher now collects AOV closures at each step and integrates them using Beer-Lambert weighting, producing physically consistent AOV outputs. (ARNOLD-6548)
- Both flat (EXR, TIFF) and deep EXR outputs are supported.
- A warning is logged when
aov_write_rgbnodes with conflictingblend_opacitysettings are connected to both surface and volume shaders writing to the same AOV name. - There is approximately a 16% overhead with two active volume AOVs at fine step sizes (
step_size=0.01).
Release Information
Version:
7.5.1.0
Release Date:
25 March 2026