Track Geometry Pipeline

From streamed.dat to textured 3D meshes on screen

TODO — Document:

• Section parsing and type-0/type-1 discrimination
• Vertex format (28-byte stride: pos, packed normal, color/AO, UV)
• Triangle strip → triangle list conversion
  • Per-object strip boundaries from descriptors at +0x84
  • Degenerate restart markers (repeated indices reset winding)
  • Winding order alternation
• Giant triangle filtering (edge length > 40 units = bridging artifact)
• Vertex color interpretation: baked ambient occlusion (greyscale 5-128)
• Per-object texture mapping from section header +0x84 uint16 array
• static.dat texture loading (DXT1/DXT3/DXT5 scan)
• Road spine extraction from section centers
• Spawn point calculation (nearest road surface vertex)
• Performance: ~1400 draw calls per track at ~18 FPS