XgarhontX / TJunctionRemover

Unity ProBuilder script that resolves mesh T-junctions while preserving UV0.

TJunctionRemover

Unity w/ ProBuilder script that resolves mesh t-junctions while preserving UV0.

• Made on Unity 2022.3.13f1 w/ ProBuilder 5.2.2

Why?

• RealtimeCSG (https://github.com/LogicalError/realtime-CSG-for-unity) generates lots of T-junctions.
• It's all fine until you bake lighting.
• The t-junctions causes Unity UV1 lightmap unwrap to create seams along adjancent faces.

Usage

• Add TJunctionRemover to ProBuilderMesh containing GameObjects.
• Click fix (can multi-select for bulk, or add TJunctionRemoverBulkController to parent of ProBuilderMeshes).

Demo

TODO pic or vid

How it works

• For each vertex to each edge.
• Check if vertex lies on edge.
  • Uses threshold to combat floating point.
  • 2 modes
    • Greedy: Try to fix first found edge meeting threshold.
    • Best: Score all edges meeting threshold and pick the best.
• Add a new vertex on overlapped edge.
  • This can throw exception, vertex will be skipped if so.
• Move new vertex to same position as offending vertex (while fixing UV0 of move).
• Weld new vertex with offending vertex, connecting face and resolving T-junction.