Like many other wireframe rendering solutions in Unity, the script side of this toolset stores barycentric coordinates as tangent vectors in a modified mesh asset.
Unlike others, the shader implementation is built entirely in the Shader Graph, making customisation significantly easier without having to jump into code.
Editor/BarycentricWireframeEditor.cs- provides a GUI for processing game objects selected in the hierarchy, caching them in the specified folder for efficient use
- Re-processing the same asset shouldn't break anything, and will simply use the existing cached asset data
Scripts/BarycentricWireframe.cs- This is automatically attached to game objects that have been processed through the GUI, and stores the source mesh for re-processing (in situations where the source mesh is changed, this allows for updates to be processed more easily)
BarycentricWireframeUtility.cs- Stores the barycentric calculation code for use by any other scripts, including the GUI
Shaders/Wireframe-Blend.shadersubgraph- Combines the functionality of both subgraphs below for creative use cases where a blend of pixel and polygon relative measurements are needed
Wireframe-Pixel.shadersubgraph- Pixel based wireframe width calculation, works as a pseudo-screen-space effect and renders the same line regardless of distance (though lines at glancing angles will tend to fall off)
Wireframe-Polygon.shadersubgraph- Polygon based wireframe width calculation, works best on meshes with semi-consistent polygon sizes, or for situations where unique effects are needed
Wireframe.shadergraph- Implementation example using the Wireframe-Blend sub-graph for a simple wireframe material
This has not been fully tested (especially updated mesh re-processing), but it seems to be working well in Unity 6.0. No warranty provided, use at your own risk.
Other open source options to check out:
- https://github.com/nobnak/WireframeShaderUnity
- Implements barycentric wireframe rendering in shader code, and requires the addition of a scoped registry just to load a few lines of support code
- https://github.com/Milun/unity-solidwire-shader
- Implements wireframe rendering using data from a custom Blender exporter, and requires meshes to be processed through that system instead of within Unity