//-----------------------------------------------------------------------------
// Name:
// Desc:
//-----------------------------------------------------------------------------
VOID CMyD3DApplication::ComputeTangentsAndBinormals()
{
EMBOSSVERTEX* pVertices;
WORD* pIndices;
DWORD dwNumVertices;
DWORD dwNumIndices;
// Gain access to the object's vertex and index buffers
LPDIRECT3DVERTEXBUFFER8 pVB;
m_pObject->GetSysMemMesh()->GetVertexBuffer( &pVB );
pVB->Lock( 0, 0, (BYTE**)&pVertices, 0 );
dwNumVertices = m_pObject->GetSysMemMesh()->GetNumVertices();
LPDIRECT3DINDEXBUFFER8 pIB;
m_pObject->GetSysMemMesh()->GetIndexBuffer( &pIB );
pIB->Lock( 0, 0, (BYTE**)&pIndices, 0 );
dwNumIndices = m_pObject->GetSysMemMesh()->GetNumFaces() * 3;
// Allocate space for the vertices' tangents and binormals
m_pTangents = new D3DXVECTOR3[dwNumVertices];
m_pBinormals = new D3DXVECTOR3[dwNumVertices];
ZeroMemory( m_pTangents, sizeof(D3DXVECTOR3)*dwNumVertices );
ZeroMemory( m_pBinormals, sizeof(D3DXVECTOR3)*dwNumVertices );
// Generate the vertices' tangents and binormals
for( DWORD i=0; i<dwNumIndices; i+=3 )
{
WORD a = pIndices[i+0];
WORD b = pIndices[i+1];
WORD c = pIndices[i+2];
// To find a tangent that heads in the direction of +tv(texcoords),
// find the components of both vectors on the tangent surface ,
// and add a linear combination of the two projections that head in the +tv direction
m_pTangents[a] += ComputeTangentVector( pVertices[a], pVertices[b], pVertices[c] );
m_pTangents[b] += ComputeTangentVector( pVertices[b], pVertices[a], pVertices[c] );
m_pTangents[c] += ComputeTangentVector( pVertices[c], pVertices[a], pVertices[b] );
}
for( i=0; i<dwNumVertices; i++ )
{
// Normalize the tangents
D3DXVec3Normalize( &m_pTangents[i], &m_pTangents[i] );
// Compute the binormals
D3DXVec3Cross( &m_pBinormals[i], &pVertices[i].n, &m_pTangents[i] );
}
// Unlock and release the vertex and index buffers
pIB->Unlock();
pVB->Unlock();
pIB->Release();
pVB->Release();
}
BRUSH* ConvertXModelToBrushFormat ( char* szFilename, BRUSH* pBrush, int* piCount, LPDIRECT3DDEVICE8 lpDevice )
{
// takes an x model and converts it into brushes
// check the pointers are valid
if ( !szFilename || !piCount )
return NULL;
// used to access vertex data
struct sMeshData
{
float x, y, z;
float nx, ny, nz;
float tu, tv;
};
// variable declarations
tagModelData* ptr; // model data
LPDIRECT3DVERTEXBUFFER8 pMeshVertexBuffer; // vertex buffer
LPDIRECT3DINDEXBUFFER8 pMeshIndexBuffer; // index buffer
sMeshData* pMeshVertices; // mesh vertices
WORD* pMeshIndices; // mesh indices
sMesh* pMesh; // mesh data
int iCount;
// load the model
Constructor ( lpDevice );
ptr = Load ( 1, szFilename );
pMesh = ptr->m_Object.m_Meshes;
// count the number of brushes so we can allocate enough memory for them
iCount = 0;
while ( pMesh )
{
pMesh = pMesh->m_Next;
iCount++;
}
// store the number of models in the brush count pointer
*piCount = iCount;
// now setup the brushes
pBrush = new BRUSH [ iCount ]; // allocate memory
// set the mesh pointer back to the original mesh
pMesh = ptr->m_Object.m_Meshes;
// run through all meshes and store the brush data
// first off set iCount to 0 so we know which brush
// we are dealing with
iCount = 0;
while ( pMesh )
{
int iInd = 0;
DWORD dwNumVertices = pMesh->m_Mesh->GetNumVertices ( );
DWORD dwNumFaces = pMesh->m_Mesh->GetNumFaces ( );
pBrush [ iCount ].Faces = new POLYGON [ dwNumFaces ];
pBrush [ iCount ].FaceCount = dwNumFaces;
pBrush [ iCount ].Bounds.Max = D3DXVECTOR3 ( 150.0f, 150.0f, 150.0f );
pBrush [ iCount ].Bounds.Min = D3DXVECTOR3 ( -150.0f, -150.0f, -150.0f );
pBrush [ iCount ].BSPTree = NULL;
pMesh->m_Mesh->GetVertexBuffer ( &pMeshVertexBuffer );
pMesh->m_Mesh->GetIndexBuffer ( &pMeshIndexBuffer );
DWORD dwFVF = pMesh->m_Mesh->GetFVF ( );
pMeshVertexBuffer->Lock ( 0, pMesh->m_Mesh->GetNumVertices ( ) * sizeof ( sMeshData ), ( BYTE** ) &pMeshVertices, 0 );
pMeshIndexBuffer->Lock ( 0, 3 * pMesh->m_Mesh->GetNumFaces ( ) * sizeof ( WORD ), ( BYTE** ) &pMeshIndices, 0 );
for ( int iTemp = 0; iTemp < dwNumFaces; iTemp++ )
{
char szX [ 256 ];
char szY [ 256 ];
char szZ [ 256 ];
int iA = pMeshIndices [ iInd + 0 ];
int iB = pMeshIndices [ iInd + 1 ];
int iC = pMeshIndices [ iInd + 2 ];
WORD wIndices [ ] = { 0, 1, 2 };
pBrush [ iCount ].Faces [ iTemp ].IndexCount = 3;
pBrush [ iCount ].Faces [ iTemp ].TextureIndex = 0;
pBrush [ iCount ].Faces [ iTemp ].VertexCount = 3;
pBrush [ iCount ].Faces [ iTemp ].Indices = new WORD [ 3 ];
pBrush [ iCount ].Faces [ iTemp ].Vertices = new D3DVERTEX [ 3 ];
pBrush [ iCount ].Faces [ iTemp ].Vertices [ 0 ] = SetupVertex ( pMeshVertices [ iA ].x, pMeshVertices [ iA ].y, pMeshVertices [ iA ].z, pMeshVertices [ iA ].tu, pMeshVertices [ iA ].tv );
pBrush [ iCount ].Faces [ iTemp ].Vertices [ 1 ] = SetupVertex ( pMeshVertices [ iB ].x, pMeshVertices [ iB ].y, pMeshVertices [ iB ].z, pMeshVertices [ iB ].tu, pMeshVertices [ iB ].tv );
pBrush [ iCount ].Faces [ iTemp ].Vertices [ 2 ] = SetupVertex ( pMeshVertices [ iC ].x, pMeshVertices [ iC ].y, pMeshVertices [ iC ].z, pMeshVertices [ iC ].tu, pMeshVertices [ iC ].tv );
for ( int iChar = 0; iChar < 3; iChar++ )
{
sprintf ( szX, "%.1f", pBrush [ iCount ].Faces [ iTemp ].Vertices [ iChar ].x );
sprintf ( szY, "%.1f", pBrush [ iCount ].Faces [ iTemp ].Vertices [ iChar ].y );
sprintf ( szZ, "%.1f", pBrush [ iCount ].Faces [ iTemp ].Vertices [ iChar ].z );
pBrush [ iCount ].Faces [ iTemp ].Vertices [ iChar ].x = atof ( szX );
pBrush [ iCount ].Faces [ iTemp ].Vertices [ iChar ].y = atof ( szY );
pBrush [ iCount ].Faces [ iTemp ].Vertices [ iChar ].z = atof ( szZ );
}
memcpy ( pBrush [ iCount ].Faces [ iTemp ].Indices, wIndices, sizeof ( wIndices ) );
CalculateNormal ( &pBrush [ iCount ].Faces [ iTemp ] );
iInd += 3;
}
SetBlockPosition ( &pBrush [ iCount ], 0.0f, 0.0f, 0.0f, 1.0f );
pMeshVertexBuffer->Unlock ( );
pMeshIndexBuffer->Unlock ( );
iCount++;
pMesh = pMesh->m_Next;
}
iCount = 0;
pMesh = ptr->m_Object.m_Meshes;
for ( int iTemp = ptr->m_Object.m_NumFrames; iTemp > 0; iTemp-- )
{
sFrame* pFrame = ptr->m_Object.m_Frames->FindFrame ( iTemp );
if ( pFrame )
{
pBrush [ iCount ].Matrix._41 = pFrame->m_matOriginal._41;
pBrush [ iCount ].Matrix._42 = pFrame->m_matOriginal._42;
pBrush [ iCount ].Matrix._43 = pFrame->m_matOriginal._43;
iCount++;
}
}
return pBrush;
}