Calinou
commented
1 year ago We should really move away from CSG nodes for drawing 3D lines procedurally, as it has a huge performance impact compared to what a lightweight Line3D node could do (https://github.com/godotengine/godot-proposals/issues/7082, https://github.com/godotengine/godot-proposals/issues/6151).
CSG requires meshes to be manifold, and removing the end caps makes the mesh non-manifold if I'm not mistaken.
Describe the project you are working on
I'm working on the TiltFive toolkit for Godot which requires a curved pointer due to the wand design.
Describe the problem or limitation you are having in your project
I'm attempting to construct the curved pointer using a CSGPolygon3D following a bezier Path3D. The "Path Continuous U = true" and "Path U Distance = 0" options result in the path mesh having a continuous texture U coordinate from 0.0 to 1.0 across the length of the path - perfect for a shader to then shade the "active" part of the pointer.
The problem is there is no way to suppress the creation of the end-caps; and the end-caps span the complete UV coordinates:
Describe the feature / enhancement and how it helps to overcome the problem or limitation
It would be nice to add a "Suppress Endcaps" boolean property.
Describe how your proposal will work, with code, pseudo-code, mock-ups, and/or diagrams
It looks like 95% of the machinery already exists in
CSGPolygon3D::_build_brush()to do this. It already suppresses the end-caps if the mode is "Spin" and the angle is 360 degrees; or if the mode is "Path" and the path is joined.If this enhancement will not be used often, can it be worked around with a few lines of script?
There appears to be no way to suppress this, or easily delete it from the ArrayMesh after construction.
Is there a reason why this should be core and not an add-on in the asset library?
The CSGPolygon3D already does a very nice job of building swept polygons around paths, and the code is not small. Replicating it in a separate asset would mean significant duplication of code, and the corresponding maintenance issues later.