Gui: Add hidden anchor object to root for transparency#26590
Merged
kadet1090 merged 2 commits intoFreeCAD:mainfrom Jan 3, 2026
Merged
Gui: Add hidden anchor object to root for transparency#26590kadet1090 merged 2 commits intoFreeCAD:mainfrom
kadet1090 merged 2 commits intoFreeCAD:mainfrom
Conversation
github-actions
bot
added
the
Mod: Core
maxwxyz
added
Approved: Tested
Member
|
We have the same issue with other planar geometry - like for example planes. Would it be possible to add element like that to the root of 3D scene instead? |
Image planes with transparency failed to render correctly in empty scenes because OpenInventor's two-pass transparency rendering requires at least one opaque object to properly initialize the depth buffer. The fix adds a zero-scaled cube with no material node (making it use OpenGL's default opaque material) to each image plane's scene graph. This hidden object: - Acts as a depth buffer anchor for transparent rendering - Is invisible (scaled to 0,0,0) - Has negligible performance impact This matches the workaround already used in the rotation center indicator and resolves the issue where image transparency only worked when the rotation center, grid, or other opaque objects were visible.
tetektoza
force-pushed
the
fix/24003_transparent_image_plane_broken
branch
from
d8ba6f8 to
df7bb7c
Compare
tetektoza
changed the title
Member
Author
|
@kadet1090 sure, done. Along this change I also tested issue that Max linked me, thx @maxwxyz (#15192) and it looks like this patch resolves this as well. |
Member
|
Does it impact bounding box calculation? It is some geometry placed in the scene so it might affect stuff like "fit all" etc. |
Prevents the hidden anchor from affecting "fit all" and other bounding box operations by wrapping it in `SoSkipBoundingGroup`.
Member
Author
|
@kadet1090 good catch, didn't even think about that. Yes, turns out it was prone to |
kadet1090
approved these changes
Jan 3, 2026
freecad-ci-runner
pushed a commit
that referenced
this pull request
Jan 3, 2026
* Gui: Add hidden anchor object to the root for transparency Image planes with transparency failed to render correctly in empty scenes because OpenInventor's two-pass transparency rendering requires at least one opaque object to properly initialize the depth buffer. The fix adds a zero-scaled cube with no material node (making it use OpenGL's default opaque material) to each image plane's scene graph. This hidden object: - Acts as a depth buffer anchor for transparent rendering - Is invisible (scaled to 0,0,0) - Has negligible performance impact This matches the workaround already used in the rotation center indicator and resolves the issue where image transparency only worked when the rotation center, grid, or other opaque objects were visible. * Gui: Exclude hidden anchor from bounding box calculations Prevents the hidden anchor from affecting "fit all" and other bounding box operations by wrapping it in `SoSkipBoundingGroup`. (cherry picked from commit 3f49f3f)
Collaborator
|
Successfully created backport PR for |
maxwxyz
pushed a commit
that referenced
this pull request
Jan 3, 2026
* Gui: Add hidden anchor object to the root for transparency Image planes with transparency failed to render correctly in empty scenes because OpenInventor's two-pass transparency rendering requires at least one opaque object to properly initialize the depth buffer. The fix adds a zero-scaled cube with no material node (making it use OpenGL's default opaque material) to each image plane's scene graph. This hidden object: - Acts as a depth buffer anchor for transparent rendering - Is invisible (scaled to 0,0,0) - Has negligible performance impact This matches the workaround already used in the rotation center indicator and resolves the issue where image transparency only worked when the rotation center, grid, or other opaque objects were visible. * Gui: Exclude hidden anchor from bounding box calculations Prevents the hidden anchor from affecting "fit all" and other bounding box operations by wrapping it in `SoSkipBoundingGroup`. (cherry picked from commit 3f49f3f)
2 tasks
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
4 participants
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Image planes with transparency failed to render correctly in empty scenes because OpenInventor's two-pass transparency rendering requires at least one opaque object to properly initialize the depth buffer.
The fix adds a zero-scaled cube with no material node (making it use OpenGL's default opaque material) to each image plane's scene graph. This hidden object:
This matches the workaround already used in the rotation center indicator and resolves the issue where image transparency only worked when the rotation center, grid, or other opaque objects were visible.
Demo:
Before:
before_24003.mp4
After:
after_24003.mp4
Resolves: #24003
Resolves: #15192
Resolves: #24309