Operating system: Darwin-19.0.0-x86_64-i386-64bit 64 Bits
Graphics card: Intel HD Graphics 4000 OpenGL Engine Intel Inc. 4.1 INTEL-14.2.16
Broken: version: 2.82 (sub 6), branch: master, commit date: 2020-01-14 23:08, hash: rB3edd8d5b075a
Short description of error
Transparency of scene is determinated by objects using non-volumetric material only.
Exact steps for others to reproduce the error
- Keep Cube
- Add Sphere
- Add Sphere a Material with Emission node plunged into Volume socket
- Film > Transparent
Example use Cube with Visibility > Holdout to rise problem more visible.
Sorry, probably a bit confusing.
Render Viewport Mode is OK
Render (F12) results with ERROR - spheres are rendered, but object itself is ignored for alpha channel
Render viewed as Color (without alpha)
Note: spheres (volumetric) are not calculated also for ID Mask or Cryptomatte as well