CollisionPolygon3D is not visible in the running project when Visible Collision Shapes is enabled in the Debug menu

[Calinou]

• Related to CollisionPolygon3D lacks the color customization options that CollisionShape3D has #101414.

Tested versions

• Reproducible in: 4.4.dev 24d7451
• Not reproducible in: 4.3.stable

System information

Godot v4.4.dev (24d7451) - Fedora Linux 41 (KDE Plasma) on X11 - X11 display driver, Multi-window, 1 monitor - Vulkan (Forward+) - dedicated NVIDIA GeForce RTX 4090 (nvidia; 565.77) - 13th Gen Intel(R) Core(TM) i9-13900K (32 threads)

Issue description

CollisionPolygon3D is not visible in the running project when Visible Collision Shapes is enabled in the Debug menu.

4.3.stable

master

master (in the editor)

Steps to reproduce

• Load the MRP linked below.
• Enable Debug > Visible Collision Shapes then run the project.
• Notice how only the sphere collision shape appears, not the collision polygon, despite both being direct children of their respective StaticBody3D.

Minimal reproduction project (MRP)

test_collision_polygon3d.zip

[smix8]

Does not happen in Godot 4.4 dev5 and started with dev6.

EDIT

Someone did the bisect and is indeed #90644 that caused the regression.

[smix8]

@BattyBovine if you are available to look into this regression.

[BattyBovine]

This is strange, because I never touched anything specific to CollisionPolygon3D. I'm still going to look into it because I do have to also add the filled shapes to CollisionPolygon3D, and clearly something happened here that I should fix.

[BattyBovine]

The solution here turned out to be pretty simple. CollisionPolygon3D did not support custom debug colours (#101414), and therefore was rendering its debug lines as Color(0.0, 0.0, 0.0, 0.0), making them invisible. By fixing #101414, we also fix this. I'll get the fix finalised soon.