Grid in rendered orthogonal views does not adapt to displacement #82337
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Reference: blender/blender#82337
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System Information
Operating system: Darwin-19.6.0-x86_64-i386-64bit 64 Bits; macOS-14.2.1-arm64-arm-64bit 64 Bits
Graphics card: AMD Radeon Pro 5500M OpenGL Engine ATI Technologies Inc. 4.1 ATI-3.10.16; Metal API Apple M1 Max 1.2
Blender Version
Broken: version: 2.92.0 Alpha, branch: master, commit date: 2020-11-01 20:34, hash:
c887a50f62; 4.2.0 Alpha, branch: main, commit date: 2024-03-10 18:36, hash:703353b5dafcWorked: unknown
Short description of error
When in cycles rendered view, in an orthogonal view, the grid does not adapt to displacement, giving some strange looking results.
Exact steps for others to reproduce the error
Add displacement to an object. Go to rendered view, orthogonal. Grid does not adapt to the new object shape, see screenshot.
Added subscriber: @blenderrocket
Added subscriber: @StephenSwaney
Changed status from 'Needs Triage' to: 'Needs User Info'
A .blend would be very helpful. Got a simple one?
Here you go
gridbug.blend
I just noticed it is also buggy in perspective view (file above):
Changed status from 'Needs User Info' to: 'Confirmed'
Added subscriber: @Jeroen-Bakker
This is by design, but will mark it as a known issue as there isn't a good solution without introducing other artifacts. The cause of this is that Cycles only provides the colors, and the depth is provided by the draw manager (OpenGL). Providing the depth buffer by cycles would still introduce artifacts in any overlay.
Even if possible, and without any overhead implementing displacement to all other areas (depth, selection, workbench, eevee, overlay) would still mean that it only works for render engines that share blender's node tree.
Eevee next does handle this properly (only the selection outline is still shown at the non-displaced location, which might be by design). As the overlay engine was also refactored, it might be more easily fixable now for cycles too?
It is a limitation for any “external” render engine. Cycles has been written as an external render engine and shows the same limitations.
Overlay engine refactor is planned for later, but would not change this. The proper solution would be that external render engines would also send their depth/z buffer when used in the viewport. I am not aware of anyone working on that topic. A related topic would be multi layered viewport rendering as part of the viewport compositor.