Sims 3:0x01661233

Tutorials:TS3 Advanced Coding Tutorials -> Sims 3:PackedFileTypes
Tutorials:TS3 Advanced Coding Tutorials -> Sims 3:RCOL

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Object Model

This is a Sims 3:RCOL chunk. The .model files that it is found in are essentially object mesh files, with this chunk included. A few meshes have two MODL chunks, purpose unknown.

DWORD		// 'MODL'
DWORD version	// 256 or 258 seen
DWORD count	// of MLOD references, see below
FLOAT[6]	// bounding box for entire object (MinX/MinY/MinZ/MaxX/MaxY/MaxZ)

--if version >=258
	// these extra boundingboxes have been seen on City Hall and School community objects (pommes)
	DWORD NumExtraBoundingBoxes
	--repeat NumExtraBoundingBoxes
		FLOAT[6] Boundingbox	// (MinX/MinY/MinZ/MaxX/MaxY/MaxZ)
		DWORD[2]

//MLOD References:
--repeat count
	WORD MLOD_Index	// into TGI Index of the MODL RCOL
	WORD Index Type	// 0x0000 = Internal resources, 0x3000 = External resources
	DWORD
	DWORD LOD	// 0x00000000, 0x00000001, 0x00010000, 0x00010001
	DWORD		// appears to be a compressed 3D vector
	DWORD		// appears to be a compressed 3D vector

Based on contributions from karybdis and atavera

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Sims 3:Main Page -> Sims 3:PackedFileTypes
Sims 3:Main Page -> Sims 3:RCOL