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I want to stay away from D3DX animation "module" so i am trying to write plugin for 3ds max to export skinned mesh to my own format.
I dumped some info into text file to see how many bones is each vertex influenced:
... VERT[19] BCNT: 1 BINX: 32 Weight: 1.000000 VERT[20] BCNT: 1 BINX: 32 Weight: 1.000000 VERT[21] BCNT: 1 BINX: 32 Weight: 1.000000 VERT[22] BCNT: 1 BINX: 32 Weight: 1.000000 VERT[23] BCNT: 1 BINX: 32 Weight: 1.000000 VERT[24] BCNT: 2 BINX: 31 Weight: 0.337000 BINX: 32 Weight: 0.663000 VERT[25] BCNT: 2 BINX: 31 Weight: 0.330000 BINX: 32 Weight: 0.670000 VERT[26] BCNT: 2 BINX: 31 Weight: 0.371000 BINX: 32 Weight: 0.629000 ...
Some vertex have influence by 1, some by 2 and some by 3 bones.
This is the problem since in HLSL shader i need to know how many bones have influence to correctly transform my vertex.
What is the common way for this?
Should i add another vertex element to be able to tell?
Something like:
D3DVERTEXELEMENT9 vertexElements[] =
{
{ 0, 0, D3DDECLTYPE_FLOAT3, D3DDECLMETHOD_DEFAULT, D3DDECLUSAGE_POSITION, 0 },
{ 0, 12, D3DDECLTYPE_FLOAT3, D3DDECLMETHOD_DEFAULT, D3DDECLUSAGE_NORMAL, 0 },
{ 0, 24, D3DDECLTYPE_FLOAT2, D3DDECLMETHOD_DEFAULT, D3DDECLUSAGE_TEXCOORD, 0 },
{ 0, 32, D3DDECLTYPE_FLOAT3, D3DDECLMETHOD_DEFAULT, D3DDECLUSAGE_TANGENT, 0 },
{ 0, 44, D3DDECLTYPE_FLOAT3, D3DDECLMETHOD_DEFAULT, D3DDECLUSAGE_BINORMAL, 0 },
{ 0, 56, D3DDECLTYPE_UBYTE4, D3DDECLMETHOD_DEFAULT, D3DDECLUSAGE_BLENDINDICES, 0 },
{ 0, 60, D3DDECLTYPE_FLOAT4, D3DDECLMETHOD_DEFAULT, D3DDECLUSAGE_BLENDWEIGHT, 0 },
{ 0, 76, D3DDECLTYPE_UBYTE4, D3DDECLMETHOD_DEFAULT, D3DDECLUSAGE_TEXCOORD, 1 }, // put number of influence here
D3DDECL_END()
};
Thank you for your time.
