When rendering in viewport mode the draw engines do not pass correct Alpha values. #65988
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Reference: blender/blender#65988
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During testing D4638: Camera Background Images we came across the issues that holdouts and DoF rendering were having render artifacts might be solveable. Investigating into it lead to that the alpha values were all set to 1, so we couldn't do the right compositing of the background images afterwards.
Holdout in combination with transparent film doesn't seem to work. When scene as Film Transparent enabled and I create a viewlayer that is set to holdout, the Cycles viewport rendering shows the transparent area created by the holdout as grey world background, but not the Background images. You can try this file:
camera_background_images.blend
Just hit shift+z to go to rendered viewport to see the issue.
It does work fine in 2.79 (using mask layer in renderlayers)
Added subscriber: @Jeroen-Bakker
Added subscribers: @fclem, @sebastian_k, @SeanKennedy
When rendering in viewport mode the draw manager do not pass correct Alpha values.to When rendering in viewport mode the draw engines do not pass correct Alpha values.Added subscriber: @offshootuk
Added subscriber: @crantisz
Looks like it was fixed beetween 2.81 (sub 13), branch: master, commit date: 2019-10-02 21:39, hash:
93e8c962fcand 2.81 (sub 14), branch: master, commit date: 2019-10-06 14:05, hash:54a9649e26Patch is ready, but needs a lot of testing. As this is not a high prio, postponing this to b2.82
Added subscriber: @brecht
This is marked with the 2.82 milestone. If no fix is planned for that release, please move it to 2.83 or untag it from a specific milestone.
This seems to be working just fine in 2.83, so I guess it's already fixed.
Changed status from 'Confirmed' to: 'Resolved'
Not able to reproduce this anymore. When we redid the color management the drawing of the camera background images were also improved. Also checked with @sebastian_k