Sims 3:0x015A1849

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

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Body Geometry

This is a Sims 3:RCOL chunk.

Header

long     'GEOM'
long     Version                // 5
long     Reference Table offset // points to number of external tgi references in tail (numtgi)
long     Reference Table size   // this will be 4+(number of references*16)
long     EmbeddedID             //(0, 0x548394B9 observed)
if(EmbeddedID!=0) {
   long ChunkSize
   byte[ChunkSize]              // starts with 'MTNF'
   }
long   0                        //unknown purpose
long   0                        // unknown purpose
long   NumVerts
long   FCount                   // was named Version, but is number of vertex elements
block  VertexFormat[FCount]     // long, long, byte; documented below 9 bytes/vertex-element-count
struct VertexData[NumVerts]     // follows vertex format block, documented below
block  FaceFmt                  // long ItemCount, byte BytesPerFacepoint
long   NumFacePoints            // means faces*3
word [NumFacePoints][3]         // standard face index (three unsigned words per face) for 2-byte FaceFmt

Tail

long  flags
long  count1
long  bonehasharray[count1]  // 32-bit hash of used bone names.
long  numtgi                 // number of External references that follow
block references[numtgi]     // each is a TGI[sub]64[/sub], a 16-byte quantity, so size is 16*numtgi
                             // references are to DDS textures and BONE file

VertexFormat

For each vertex count:

long   DataType
long   SubType
byte   BytesPerElement

DataType

1	Position	(3 float == 12 bytes)
2	Normal	(3 float == 12 bytes)
3	UV	(2 float == 8 bytes)
4	Bone Assignment	(long == 4 bytes)
5	Weights	(4 float == 16 bytes)
6	Tangent Normal	(3 float == 12 bytes)
7	TagVal	(4 packed bytes) -- colour channel data
10	VertexID	(long == 4 bytes)

SubType

1	floats
2	bytes
4	long

You calculate the offset of each element from the sum of the previous BytesPerElement

Based on contributions from karybdis and atavera

Examples

Known Vertex Formats:

Format 3 VertexData is:
float PositionDelta[3]
float NormalDelta[3]
long VertID
[28 bytes per vertex]

Format 6 VertexData is:
float    Position[3]      // XYZ, Y is UP
float    Normal[3]
float    UV[2]
long    Bone Assignments  // a packed byte array, parsed lo order to high order
float    Weights[4]          // first weight is lowest order byte of assignments, 0.0 (0L) weights are unassigned slots
float    Tangent Normal[3]
[64 bytes per vertex]

Format 7 VertexData is:
float    Position[3]      // XYZ, Y is UP
float    Normal[3]
float    UV[2]
long    Bone Assignments  // packed byte array
float    Weights[4]
long    VertID
float    Tangent Normal[3]
[68 bytes per vertex]

Format 8 VertexData is:
float    Position[3]      // XYZ, Y is UP
float    Normal[3]
float    UV[2]
long    Tagval           // color channel bytes
long    Bone Assignments  // a packed byte array
float    Weights[4]
long    VertID
float   Tangent Normal[3]
[72 bytes per vertex]

Reading Vertex Data Blocks

For each vertex, you need to loop through the VertexFormat as defined, and read the information in order.

The order can be completely arbitary, and varied in size.

Here is some example code in c# to do so:

for (int i = 0; i < numVerts; i++)
{
	for (int j = 0; j < vertexFormats.Count; j++)
	{
		float x = 0;
		float y = 0;
		float z = 0;
		vertexFormat vf = (vertexFormat)vertexFormats[j];
		switch (vf.dataType)
		{
			case 1:
				x = reader.ReadSingle();
				z = reader.ReadSingle();
				y = reader.ReadSingle();
				sb.AppendLine("  XYZ: " + x.ToString() + " " + y.ToString() + " " + z.ToString() );
				break;
			case 2:
				x = reader.ReadSingle();
				z = reader.ReadSingle();
				y = reader.ReadSingle();
				sb.AppendLine("  Normal: " + x.ToString() + " " + y.ToString() + " " + z.ToString() );
				break;
			case 3:
				float u = reader.ReadSingle();
				float v = reader.ReadSingle();
				sb.AppendLine("  UV: " + u.ToString() + " " + v.ToString() );
				break;
			case 4:
				sb.AppendLine("  Bone: " + reader.ReadUInt32().ToString() );
				break;
			case 5:
				float w1 = reader.ReadSingle();
				float w2 = reader.ReadSingle();
				float w3 = reader.ReadSingle();
				float w4 = reader.ReadSingle();
				sb.AppendLine("  Weights: " + w1.ToString() + " " + w2.ToString() + " "
					+ w3.ToString() + " " + w4.ToString() );
				break;
			case 6:
				x = reader.ReadSingle();
				z = reader.ReadSingle();
				y = reader.ReadSingle();
				sb.AppendLine("  Tangent Normal: " + x.ToString() + " " + y.ToString() + " " + z.ToString() );
				break;
			case 7:
				// Note, not splitting this up yet just reading an int
				sb.AppendLine("  TagVal: " + reader.ReadUInt32().ToString() );
				break;
			case 10:
				sb.AppendLine("  VertexID: " + reader.ReadUInt32().ToString() );
				break;
		}
	}
}

Note that basically we just look through the VertexFormat, and read the data in order. There is no fixed "vertex format" version, it's all controlled via the vertexformat data.

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