Hello,
My bounding sphere function used to work okay.
Unfortunately, my cMesh class has got a bit more sophisticated and caused a knock on effect. I've added code that computes the tangents of a supplied mesh. It clones the previous mesh into a new one with the extended FVF.
Unfortunately, now the GetFVF() function I'm using returns this error:
D3DX: ID3DXMesh::GetFVF: The declaration cannot be converted to an FVF
SDK says:
Quote:
This method can return 0 if the vertex format cannot be mapped directly to an FVF code. This will occur for a mesh created from a vertex declaration that doesn't have the same order and elements supported by the FVF codes.
Sounds like my problem... how do convert this declaration into an FVF compatible one?
Heres the code which builds the tangents.
// Expand the mesh to hold tangent data
D3DVERTEXELEMENT9 decl[] =
{
{ 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 },
D3DDECL_END()
};
hr = m_pMesh->CloneMesh( dw32BitFlag | D3DXMESH_MANAGED, decl, g_device,
&l_pTempMesh );
if (FAILED(hr))
{
StringCchPrintf( temp, 100, "cSimpleMesh::CloneMesh() - FAILED - '%s'\n", m_name );
OutputDebugString( temp );
SAFE_RELEASE(l_pTempMesh);
return;
}
hr = D3DXComputeTangent( l_pTempMesh, // input mesh
0, // TexStageIndex
0, // TangentIndex
0, // BinormIndex
0, // Wrap
pAdjacency//NULL // Adjacency
);
m_pMesh->Release();
m_pMesh = l_pTempMesh;
delete pAdjacency;
// END OF TANGENT BUILDER ----------------------------------------------------------------------
and heres the call to GetFVF():
D3DXVECTOR3 *vertices;
if( SUCCEEDED( mesh->LockVertexBuffer( D3DLOCK_READONLY, (void**)&vertices ) ) )
{
D3DXComputeBoundingSphere( vertices, mesh->GetNumVertices(), D3DXGetFVFVertexSize( mesh->GetFVF() ), &m_sphere->centre, &m_sphere->radius );
mesh->UnlockVertexBuffer();
}
Thanks for yuor advice.
Simon
