Smf2

SMFFile
{
Header header;
SkinnedMesh mesh;
BoundingVolumeType type;
BoundingVolume bv; //of a type declared in a previous line
}

Header
{
uint Signature; // = '2FMS';
uint SkeletonId; // 0 here means lack of skeleton
}

SkinnedMesh
{
uint NumVertices;
uint NumSubMeshes;
SkinVertex4 Vertices[NumVertices];
SubMesh SubMeshes[NumSubMeshes];
}

SkinVertex4
{
vector3f Position;
vector3f Normal;
vector2f TexCoord;
uint JointIndices[4];
float JointWeights[4];
}

SubMesh
{
uint MaterialId; // 0 if there is no material.
uint NumIndices;
uint Indices[NumIndices];
}

enum BoundingVolumeType : unsigned char
{
AABB = 1;
OBB = 2;
Sphere = 3;
}

AABB : BoundingVolume
{
float xmin, ymin, zmin, xmax, ymax, zmax;
}

OBB : BoundingVolume
{
vector3f center;
vector3f  ox, oy, oz;    // half length in directions x, y, z
}

Sphere : BoundingVolume
{
vector3f center;
float radius;
}