BMDL
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BMDL is the low-level model format used by 3DMM.
Length: varies
00: Chunk Signature (4 bytes) 04: Vertex count (2 bytes) 06: Triangle count (2 bytes) 08: Unknown (40 bytes) 48: First vertex (32 bytes): 00: X coordinate (4 bytes) 04: Y coordinate (4 bytes) 08: Z coordinate (4 bytes) 12: U coordinate (4 bytes) 16: V coordinate (4 bytes) 20: Unknown (12 bytes) NN: First triangle (32 bytes, at position 48+triangle count*32) 00: Point 1 index (2 bytes) 02: Point 2 index (2 bytes) 06: Point 3 index (2 bytes) 08: Unknown (26 bytes)