//-----------------------------------------------------------------------------
void CPUTModel::UpdateBoundsWorldSpace()
{
// If an object is rigid, then it's object-space bounding box doesn't change.
// However, if it moves, then it's world-space bounding box does change.
// Call this function when the model moves
float4x4 *pWorld = GetWorldMatrix();
float4 center = float4(mBoundingBoxCenterObjectSpace, 1.0f); // W = 1 because we want the xlation (i.e., center is a position)
float4 half = float4(mBoundingBoxHalfObjectSpace, 0.0f); // W = 0 because we don't want xlation (i.e., half is a direction)
// TODO: optimize this
float4 positions[8] = {
center + float4( 1.0f, 1.0f, 1.0f, 0.0f ) * half,
center + float4( 1.0f, 1.0f,-1.0f, 0.0f ) * half,
center + float4( 1.0f,-1.0f, 1.0f, 0.0f ) * half,
center + float4( 1.0f,-1.0f,-1.0f, 0.0f ) * half,
center + float4(-1.0f, 1.0f, 1.0f, 0.0f ) * half,
center + float4(-1.0f, 1.0f,-1.0f, 0.0f ) * half,
center + float4(-1.0f,-1.0f, 1.0f, 0.0f ) * half,
center + float4(-1.0f,-1.0f,-1.0f, 0.0f ) * half
};
float4 minPosition( FLT_MAX, FLT_MAX, FLT_MAX, 1.0f );
float4 maxPosition(-FLT_MAX, -FLT_MAX, -FLT_MAX, 1.0f );
for( UINT ii=0; ii<8; ii++ )
{
float4 position = positions[ii] * *pWorld;
minPosition = Min( minPosition, position );
maxPosition = Max( maxPosition, position );
}
mBoundingBoxCenterWorldSpace = (maxPosition + minPosition) * 0.5f;
mBoundingBoxHalfWorldSpace = (maxPosition - minPosition) * 0.5f;
}
bool NVMeshMender::MungeD3DX( const NVMeshMender::VAVector& input,
NVMeshMender::VAVector& output,
const float bSmoothCreaseAngleRadians,
const float* pTextureMatrix,
const Option _FixTangents,
const Option _FixCylindricalTexGen,
const Option _WeightNormalsByFaceSize )
{
typedef std::map< std::string, unsigned int > Mapping;
typedef std::set< Edge > EdgeSet;
typedef std::vector< std::set< unsigned int > > IdenticalVertices;
IdenticalVertices IdenticalVertices_;
Mapping inmap;
Mapping outmap;
for ( unsigned int a = 0; a < input.size(); ++a )
{
inmap[ input[ a ].Name_ ] = a;
}
for ( unsigned int b = 0; b < output.size(); ++b )
{
output[ b ].intVector_.clear();
output[ b ].floatVector_.clear();
outmap[ output[ b ].Name_ ] = b;
}
for ( unsigned int c = 0; c < output.size(); ++c )
{
// for every output that has a match in the input, just copy it over
Mapping::iterator in = inmap.find( output[ c ].Name_ );
if ( in != inmap.end() )
{
// copy over existing indices, position, or whatever
output[ c ] = input[ (*in).second ];
}
}
Mapping::iterator want = outmap.find( "indices" );
Mapping::iterator have = inmap.find( "indices" );
if ( have == inmap.end() )
{
SetLastError( "Missing indices from input" );
return false;
}
if ( want == outmap.end() )
{
SetLastError( "Missing indices from output" );
return false;
}
// Go through all required outputs & generate as necessary
want = outmap.find( "position" );
have = inmap.find( "position" );
if ( have == inmap.end() )
{
SetLastError( "Missing position from input" );
return false;
}
if ( want == outmap.end() )
{
SetLastError( "Missing position from output" );
return false;
}
Mapping::iterator pos = outmap.find( "position" );
VertexAttribute::FloatVector& positions = output[ (*pos).second ].floatVector_;
D3DXVECTOR3* pPositions = (D3DXVECTOR3*)( &( positions[ 0 ] ) );
std::set< unsigned int > EmptySet;
for ( unsigned int i = 0; i < positions.size(); i += 3 )
{
IdenticalVertices_.push_back( EmptySet );
}
// initialize all attributes
for ( unsigned int att = 0; att < output.size(); ++att )
{
if ( output[ att ].Name_ != "indices" )
{
if ( output[ att ].floatVector_.size() == 0 )
{
output[ att ].floatVector_ = positions;
}
}
}
Mapping::iterator ind = outmap.find( "indices" );
VertexAttribute::IntVector& indices = output[ (*ind).second ].intVector_;
int* pIndices = (int*)( &( indices[ 0 ] ) );
D3DXVECTOR3* pNormals = 0;
D3DXVECTOR3* pBiNormals = 0;
D3DXVECTOR3* pTangents = 0;
D3DXVECTOR3* pTex0 = 0;
bool bNeedNormals = false;
bool bNeedTexCoords = false;
bool bComputeTangentSpace = false;
// see if texture coords are needed
if ( outmap.find( "tex0" ) != outmap.end() )
{
bNeedTexCoords = true;
}
// see if tangent or binormal are needed
if ( ( outmap.find( "binormal" ) != outmap.end() ) ||
( outmap.find( "tangent" ) != outmap.end() ) )
{
bComputeTangentSpace = true;
}
// see if normals are needed
if ( outmap.find( "normal" ) != outmap.end() )
{
bNeedNormals = true;
}
// Compute normals.
want = outmap.find( "normal" );
have = inmap.find( "normal" );
bool have_normals = ( inmap.find( "normal" ) != inmap.end() ) ? true : false;
if ( bNeedNormals || bComputeTangentSpace )
{
// see if normals are provided
if ( !have_normals )
{
// create normals
if ( want == outmap.end() )
{
VertexAttribute norAtt;
norAtt.Name_ = "normal";
output.push_back( norAtt );
outmap[ "normal" ] = output.size() - 1;
want = outmap.find( "normal" );
}
// just initialize array so it's the correct size
output[ (*want).second ].floatVector_ = positions;
VertexAttribute::FloatVector& normals = output[ (*want).second ].floatVector_;
// zero out normals
for ( unsigned n = 0; n < positions.size(); ++n )
{
output[ (*want).second ].floatVector_[ n ] = 0.0f;
}
pNormals = (D3DXVECTOR3*)( &( output[ (*want).second ].floatVector_[0] ) );
// calculate face normals for each face
// & add its normal to vertex normal total
for ( unsigned int t = 0; t < indices.size(); t += 3 )
{
D3DXVECTOR3 edge0, nedge0;
D3DXVECTOR3 edge1, nedge1;
edge0 = pPositions[ indices[ t + 1 ] ] - pPositions[ indices[ t + 0 ] ];
edge1 = pPositions[ indices[ t + 2 ] ] - pPositions[ indices[ t + 0 ] ];
D3DXVec3Normalize(&nedge0, &edge0);
D3DXVec3Normalize(&nedge1, &edge1);
D3DXVECTOR3 faceNormal;
D3DXVec3Cross( &faceNormal, &nedge0, &nedge1 );
if ( _WeightNormalsByFaceSize == DontWeightNormalsByFaceSize )
{
// Renormalize face normal, so it's not weighted by face size
D3DXVec3Normalize( &faceNormal, &faceNormal );
}
else
{
// Leave it as-is, to weight by face size naturally by the cross product result
}
pNormals[ indices[ t + 0 ] ] += faceNormal;
pNormals[ indices[ t + 1 ] ] += faceNormal;
pNormals[ indices[ t + 2 ] ] += faceNormal;
}
// Renormalize each vertex normal
for ( unsigned int v = 0; v < output[ (*want).second ].floatVector_.size() / 3; ++v )
{
D3DXVec3Normalize( &( pNormals[ v ] ), &( pNormals[ v ] ) );
}
}
}
// Compute texture coordinates.
if ( bNeedTexCoords || bComputeTangentSpace )
{
have = inmap.find( "tex0" );
want = outmap.find("tex0");
bool have_texcoords = (inmap.find( "tex0" ) != inmap.end()) ? true : false;
// see if texcoords are provided
if ( !have_texcoords )
{
// compute texcoords.
if ( want == outmap.end() )
{
VertexAttribute texCoordAtt;
texCoordAtt.Name_ = "tex0";
output.push_back( texCoordAtt );
outmap[ "tex0" ] = output.size() - 1;
want = outmap.find( "tex0" );
}
// just initialize array so it's the correct size
output[ (*want).second ].floatVector_ = positions;
pTex0 = (D3DXVECTOR3*)( &(output[ (*want).second ].floatVector_[ 0 ]) );
// Generate cylindrical coordinates
// Find min and max positions for object bounding box
D3DXVECTOR3 maxPosition( -FLT_MAX, -FLT_MAX, -FLT_MAX );
D3DXVECTOR3 minPosition( FLT_MAX, FLT_MAX, FLT_MAX );
// there are 1/3 as many vectors as floats
const unsigned int theCount = static_cast<unsigned int>(positions.size() / 3.0f);
for ( unsigned int i = 0; i < theCount; ++i )
{
#ifndef __GNUC__
maxPosition.x = max( maxPosition.x, pPositions[ i ].x );
maxPosition.y = max( maxPosition.y, pPositions[ i ].y );
maxPosition.z = max( maxPosition.z, pPositions[ i ].z );
minPosition.x = min( minPosition.x, pPositions[ i ].x );
minPosition.y = min( minPosition.y, pPositions[ i ].y );
minPosition.z = min( minPosition.z, pPositions[ i ].z );
#endif
}
// Find major, minor and other axis for cylindrical texgen
D3DXVECTOR3 delta = maxPosition - minPosition;
delta.x = (float)fabs( delta.x );
delta.y = (float)fabs( delta.y );
delta.z = (float)fabs( delta.z );
bool maxx,maxy,maxz;
maxx = maxy = maxz = false;
bool minz,miny,minx;
minx = miny = minz = false;
float deltaMajor;
if ( ( delta.x >= delta.y ) && ( delta.x >= delta.z ) )
{
maxx = true;
deltaMajor = delta.x;
if ( delta.y > delta.z )
{
minz = true;
}
else
{
miny = true;
}
}
else
if ( ( delta.z >= delta.y ) && ( delta.z >= delta.x ) )
{
maxz = true;
deltaMajor = delta.z;
if ( delta.y > delta.x )
{
minx = true;
}
else
{
miny = true;
}
}
else
if ( ( delta.y >= delta.z ) && ( delta.y >= delta.x ) )
{
maxy = true;
deltaMajor = delta.y;
if ( delta.x > delta.z )
{
minz = true;
}
else
{
minx = true;
}
}
for ( unsigned int p = 0; p < theCount; ++p )
{
// Find position relative to center of bounding box
D3DXVECTOR3 texCoords = ( ( maxPosition + minPosition ) / 2.0f ) - pPositions[ p ];
float Major, Minor, Other = 0.0f;
if ( maxx )
{
Major = texCoords.x;
if ( miny )
{
Minor = texCoords.y;
Other = texCoords.z;
} else {
Minor = texCoords.z;
Other = texCoords.y;
}
}
else
if ( maxy )
{
Major = texCoords.y;
if ( minx )
{
Minor = texCoords.x;
Other = texCoords.z;
} else {
Minor = texCoords.z;
Other = texCoords.x;
}
}
else
if ( maxz )
{
Major = texCoords.z;
if ( miny )
{
Minor = texCoords.y;
Other = texCoords.x;
} else {
Minor = texCoords.x;
Other = texCoords.y;
}
}
float longitude = 0.0f;
// Prevent zero or near-zero from being passed into atan2
if ( fabs( Other ) < 0.0001f )
{
if ( Other >= 0.0f )
{
Other = 0.0001f;
} else {
Other = -0.0001f;
}
}
// perform cylindrical mapping onto object, and remap from -pi,pi to -1,1
longitude = (float)(( atan2( Minor, Other ) ) / 3.141592654);
texCoords.x = 0.5f * longitude + 0.5f;
texCoords.y = (Major/deltaMajor) + 0.5f;
#ifndef __GNUC__
texCoords.x = max( texCoords.x, 0.0f );
texCoords.y = max( texCoords.y, 0.0f );
texCoords.x = min( texCoords.x, 1.0f );
texCoords.y = min( texCoords.y, 1.0f );
#endif
pTex0[ p ].x = texCoords.x-0.25f;
if ( pTex0[ p ].x < 0.0f ) pTex0[ p ].x += 1.0;
pTex0[ p ].y = 1.0f-texCoords.y;
pTex0[ p ].z = 1.0f;
}
}
if ( _FixCylindricalTexGen == FixCylindricalTexGen )
{
Mapping::iterator texIter = outmap.find( "tex0" );
VertexAttribute::FloatVector& texcoords = ( output[ (*texIter).second ].floatVector_ );
const unsigned int theSize = indices.size();
for ( unsigned int f = 0; f < theSize; f += 3 )
{
for ( int v = 0; v < 3; ++v )
{
int start = f + v;
int end = start + 1;
if ( v == 2 )
{
end = f;
}
float dS = texcoords[ indices[ end ] * 3 + 0 ] - texcoords[ indices[ start ] * 3 + 0 ];
float newS = 0.0f;
bool bDoS = false;
unsigned int theOneToChange = start;
if ( fabs( dS ) >= 0.5f )
{
bDoS = true;
if ( texcoords[ indices[ start ] * 3 + 0 ] < texcoords[ indices[ end ] * 3 + 0 ] )
{
newS = texcoords[ indices[ start ]* 3 + 0 ] + 1.0f;
}
else
{
theOneToChange = end;
newS = texcoords[ indices[ end ] * 3 + 0 ] + 1.0f;
}
}
if ( bDoS == true )
{
unsigned int theNewIndex = texcoords.size() / 3;
// Duplicate every part of the vertex
for ( unsigned int att = 0; att < output.size(); ++att )
{
// No new indices are created, just vertex attributes
if ( output[ att ].Name_ != "indices" )
{
if ( output[ att ].Name_ == "tex0" )
{
output[ att ].floatVector_.push_back( newS ); // y
output[ att ].floatVector_.push_back( output[ att ].floatVector_[ indices[ theOneToChange ] * 3 + 1 ] ); // x
output[ att ].floatVector_.push_back( output[ att ].floatVector_[ indices[ theOneToChange ] * 3 + 2 ] ); // z
}
else
{
// *3 b/c we are looking up 3vectors in an array of floats
output[ att ].floatVector_.push_back( output[ att ].floatVector_[ indices[ theOneToChange ] * 3 + 0 ] ); // x
output[ att ].floatVector_.push_back( output[ att ].floatVector_[ indices[ theOneToChange ] * 3 + 1 ] ); // y
output[ att ].floatVector_.push_back( output[ att ].floatVector_[ indices[ theOneToChange ] * 3 + 2 ] ); // z
}
}
}
IdenticalVertices_.push_back( EmptySet );
IdenticalVertices_[ indices[ theOneToChange ] ].insert( theNewIndex );
IdenticalVertices_[ theNewIndex ].insert( indices[ theOneToChange ] );
// point to where the new vertices will go
indices[ theOneToChange ] = theNewIndex;
}
} // for v
{
for ( int v = 0; v < 3; ++v )
{
int start = f + v;
int end = start + 1;
if ( v == 2 )
{
end = f;
}
float dT = texcoords[ indices[ end ] * 3 + 1 ] - texcoords[ indices[ start ] * 3 + 1 ];
float newT = 0.0f;
bool bDoT = false;
unsigned int theOneToChange = start;
if ( fabs( dT ) >= 0.5f )
{
bDoT = true;
if ( texcoords[ indices[ start ] * 3 + 1 ] < texcoords[ indices[ end ] * 3 + 1 ] )
{
newT = texcoords[ indices[ start ] * 3 + 1 ] + 1.0f;
}
else
{
theOneToChange = end;
newT = texcoords[ indices[ end ] * 3 + 1 ] + 1.0f;
}
}
if ( bDoT == true )
{
unsigned int theNewIndex = texcoords.size() / 3;
// Duplicate every part of the vertex
for ( unsigned int att = 0; att < output.size(); ++att )
{
// No new indices are created, just vertex attributes
if ( output[ att ].Name_ != "indices" )
{
if ( output[ att ].Name_ == "tex0" )
{
output[ att ].floatVector_.push_back( output[ att ].floatVector_[ indices[ theOneToChange ] * 3 + 0 ] ); // x
output[ att ].floatVector_.push_back( newT ); // y
output[ att ].floatVector_.push_back( output[ att ].floatVector_[ indices[ theOneToChange ] * 3 + 2 ] ); // z
}
else
{
// *3 b/c we are looking up 3vectors in an array of floats
output[ att ].floatVector_.push_back( output[ att ].floatVector_[ indices[ theOneToChange ] * 3 + 0 ] ); // x
output[ att ].floatVector_.push_back( output[ att ].floatVector_[ indices[ theOneToChange ] * 3 + 1 ] ); // y
output[ att ].floatVector_.push_back( output[ att ].floatVector_[ indices[ theOneToChange ] * 3 + 2 ] ); // z
}
}
}
IdenticalVertices_.push_back( EmptySet );
IdenticalVertices_[ theNewIndex ].insert( indices[ theOneToChange ] );
IdenticalVertices_[ indices[ theOneToChange ] ].insert( theNewIndex );
// point to where the new vertices will go
indices[ theOneToChange ] = theNewIndex;
}
}
} // for v
} // for f
} // if fix texgen
D3DXMATRIX theMatrix( 1,0,0,0,
1,0,0,0,
1,0,0,0,
1,0,0,2);
D3DXVECTOR3 v(1, 2, 3);
D3DXVec3TransformCoord( &v, &v, &theMatrix);
if ( pTextureMatrix )
{
Mapping::iterator texIter = outmap.find( "tex0" );
VertexAttribute::FloatVector& texcoords = ( output[ (*texIter).second ].floatVector_ );
// now apply matrix
for ( unsigned int v = 0; v < texcoords.size(); v += 3 )
{
D3DXVECTOR3* pVector = (D3DXVECTOR3*)( &( texcoords[ v ] ) );
D3DXMATRIX theMatrix( pTextureMatrix[ 0 ], pTextureMatrix[ 1 ], pTextureMatrix[ 2 ], pTextureMatrix[ 3 ],
pTextureMatrix[ 4 ], pTextureMatrix[ 5 ], pTextureMatrix[ 6 ], pTextureMatrix[ 7 ],
pTextureMatrix[ 8 ], pTextureMatrix[ 9 ], pTextureMatrix[ 10], pTextureMatrix[ 11],
pTextureMatrix[ 12], pTextureMatrix[ 13], pTextureMatrix[ 14], pTextureMatrix[ 15] );
D3DXVec3TransformCoord( pVector, pVector, (D3DXMATRIX*)(pTextureMatrix));
}
}
}
if ( bComputeTangentSpace )
{
Mapping::iterator texIter = outmap.find( "tex0" );
D3DXVECTOR3* tex = (D3DXVECTOR3*)&( output[ (*texIter).second ].floatVector_[ 0 ] );
typedef std::vector< D3DXVECTOR3 > VecVector;
// create tangents
want = outmap.find( "tangent" );
if ( want == outmap.end() )
{
VertexAttribute tanAtt;
tanAtt.Name_ = "tangent";
output.push_back( tanAtt );
outmap[ "tangent" ] = output.size() - 1;
want = outmap.find( "tangent" );
}
// just initialize array so it's the correct size
output[ (*want).second ].floatVector_ = positions;
// create binormals
want = outmap.find( "binormal" );
if ( want == outmap.end() )
{
VertexAttribute binAtt;
binAtt.Name_ = "binormal";
output.push_back( binAtt );
outmap[ "binormal" ] = output.size() - 1;
want = outmap.find( "binormal" );
}
// just initialize array so it's the correct size
output[ (*want).second ].floatVector_ = positions;
// Create a vector of s,t and sxt for each face of the model
VecVector sVector;
VecVector tVector;
VecVector sxtVector;
EdgeSet Edges;
const unsigned int theSize = indices.size();
// for each face, calculate its S,T & SxT vector, & store its edges
for ( unsigned int f = 0; f < theSize; f += 3 )
{
D3DXVECTOR3 edge0;
D3DXVECTOR3 edge1;
D3DXVECTOR3 s;
D3DXVECTOR3 t;
// grap position & tex coords again in case they were reallocated
pPositions = (D3DXVECTOR3*)( &( positions[ 0 ] ) );
tex = (D3DXVECTOR3*)&( output[ (*texIter).second ].floatVector_[ 0 ] );
// create an edge out of x, s and t
edge0.x = pPositions[ indices[ f + 1 ] ].x - pPositions[ indices[ f ] ].x;
edge0.y = tex[ indices[ f + 1 ] ].x - tex[ indices[ f ] ].x;
edge0.z = tex[ indices[ f + 1 ] ].y - tex[ indices[ f ] ].y;
// create an edge out of x, s and t
edge1.x = pPositions[ indices[ f + 2 ] ].x - pPositions[ indices[ f ] ].x;
edge1.y = tex[ indices[ f + 2 ] ].x - tex[ indices[ f ] ].x;
edge1.z = tex[ indices[ f + 2 ] ].y - tex[ indices[ f ] ].y;
D3DXVECTOR3 sxt;
D3DXVec3Cross( &sxt, &edge0, &edge1 );
float a = sxt.x;
float b = sxt.y;
float c = sxt.z;
float ds_dx = 0.0f;
if ( fabs( a ) > 0.000001f )
{
ds_dx = - b / a;
}
float dt_dx = 0.0f;
if ( fabs( a ) > 0.000001f )
{
dt_dx = - c / a;
}
// create an edge out of y, s and t
edge0.x = pPositions[ indices[ f + 1 ] ].y - pPositions[ indices[ f ] ].y;
edge0.y = tex[ indices[ f + 1 ] ].x - tex[ indices[ f ] ].x;
edge0.z = tex[ indices[ f + 1 ] ].y - tex[ indices[ f ] ].y;
// create an edge out of y, s and t
edge1.x = pPositions[ indices[ f + 2 ] ].y - pPositions[ indices[ f ] ].y;
edge1.y = tex[ indices[ f + 2 ] ].x - tex[ indices[ f ] ].x;
edge1.z = tex[ indices[ f + 2 ] ].y - tex[ indices[ f ] ].y;
D3DXVec3Cross( &sxt, &edge0, &edge1 );
a = sxt.x;
b = sxt.y;
c = sxt.z;
float ds_dy = 0.0f;
if ( fabs( a ) > 0.000001f )
{
ds_dy = -b / a;
}
float dt_dy = 0.0f;
if ( fabs( a ) > 0.000001f )
{
dt_dy = -c / a;
}
// create an edge out of z, s and t
edge0.x = pPositions[ indices[ f + 1 ] ].z - pPositions[ indices[ f ] ].z;
edge0.y = tex[ indices[ f + 1 ] ].x - tex[ indices[ f ] ].x;
edge0.z = tex[ indices[ f + 1 ] ].y - tex[ indices[ f ] ].y;
// create an edge out of z, s and t
edge1.x = pPositions[ indices[ f + 2 ] ].z - pPositions[ indices[ f ] ].z;
edge1.y = tex[ indices[ f + 2 ] ].x - tex[ indices[ f ] ].x;
edge1.z = tex[ indices[ f + 2 ] ].y - tex[ indices[ f ] ].y;
D3DXVec3Cross( &sxt, &edge0, &edge1 );
a = sxt.x;
b = sxt.y;
c = sxt.z;
float ds_dz = 0.0f;
if ( fabs( a ) > 0.000001f )
{
ds_dz = -b / a;
}
float dt_dz = 0.0f;
if ( fabs( a ) > 0.000001f )
{
dt_dz = -c / a;
}
// generate coordinate frame from the gradients
s = D3DXVECTOR3( ds_dx, ds_dy, ds_dz );
t = D3DXVECTOR3( dt_dx, dt_dy, dt_dz );
D3DXVec3Normalize(&s, &s);
D3DXVec3Normalize(&t, &t);
D3DXVec3Cross( &sxt, &s, &t );
D3DXVec3Normalize( &sxt, &sxt );
// save vectors for this face
sVector.push_back( s );
tVector.push_back( t );
sxtVector.push_back( sxt );
if ( _FixTangents == FixTangents )
{
// Look for each edge of the triangle in the edge map, in order to find
// a neighboring face along the edge
for ( int e = 0; e < 3; ++e )
{
Edge edge;
int start = f + e;
int end = start + 1;
if ( e == 2 )
{
end = f;
}
#ifndef __GNUC__
// order vertex indices ( low, high )
edge.v0 = min( indices[ start ], indices[ end ] );
edge.v1 = max( indices[ start ], indices[ end ] );
#endif
EdgeSet::iterator iter = Edges.find( edge );
// if we are the only triangle with this edge...
if ( iter == Edges.end() )
{
// ...then add us to the set of edges
edge.face = f / 3;
Edges.insert( edge );
}
else
{
// otherwise, check our neighbor's s,t & sxt vectors vs our own
const float sAgreement = D3DXVec3Dot( &s, &(sVector[ (*iter).face ]) );
const float tAgreement = D3DXVec3Dot( &t, &(tVector[ (*iter).face ]) );
const float sxtAgreement = D3DXVec3Dot( &sxt, &(sxtVector[ (*iter).face ]) );
// Check Radian angle split limit
const float epsilon = (float)cos( bSmoothCreaseAngleRadians );
// if the discontinuity in s, t, or sxt is greater than some epsilon,
// duplicate the vertex so it won't smooth with its neighbor anymore
if ( ( fabs( sAgreement ) < epsilon ) ||
( fabs( tAgreement ) < epsilon ) ||
( fabs( sxtAgreement ) < epsilon ) )
{
// Duplicate two vertices of this edge for this triangle only.
// This way the faces won't smooth with each other, thus
// preventing the tangent basis from becoming degenerate
// divide by 3 b/c vector is of floats and not vectors
const unsigned int theNewIndex = positions.size() / 3;
// Duplicate every part of the vertex
for ( unsigned int att = 0; att < output.size(); ++att )
{
// No new indices are created, just vertex attributes
if ( output[ att ].Name_ != "indices" )
{
// *3 b/c we are looking up 3vectors in an array of floats
output[ att ].floatVector_.push_back( output[ att ].floatVector_[ indices[ start ] * 3 + 0 ] ); // x
output[ att ].floatVector_.push_back( output[ att ].floatVector_[ indices[ start ] * 3 + 1 ] ); // y
output[ att ].floatVector_.push_back( output[ att ].floatVector_[ indices[ start ] * 3 + 2 ] ); // z
output[ att ].floatVector_.push_back( output[ att ].floatVector_[ indices[ end ] * 3 + 0 ] ); // x
output[ att ].floatVector_.push_back( output[ att ].floatVector_[ indices[ end ] * 3 + 1 ] ); // y
output[ att ].floatVector_.push_back( output[ att ].floatVector_[ indices[ end ] * 3 + 2 ] ); // z
}
}
IdenticalVertices_.push_back( EmptySet );
IdenticalVertices_.push_back( EmptySet );
// point to where the new vertices will go
indices[ start ] = theNewIndex;
indices[ end ] = theNewIndex + 1;
}
// Now that the vertices are duplicated, smoothing won't occur over this edge,
// because the two faces will sum their tangent basis vectors into separate indices
}
}
} // if fixtangents
}
// Allocate std::vector & Zero out average basis for tangent space smoothing
VecVector avgS;
VecVector avgT;
for ( unsigned int p = 0; p < positions.size(); p += 3 )
{
avgS.push_back( D3DXVECTOR3( 0.0f, 0.0f, 0.0f ) ); // do S
avgT.push_back( D3DXVECTOR3( 0.0f, 0.0f, 0.0f ) ); // now t
}
// go through faces and add up the bases for each vertex
const int theFaceCount = indices.size() / 3;
for ( unsigned int face = 0; face < (unsigned int)theFaceCount; ++face )
{
// sum bases, so we smooth the tangent space across edges
avgS[ pIndices[ face * 3 ] ] += sVector[ face ];
avgT[ pIndices[ face * 3 ] ] += tVector[ face ];
avgS[ pIndices[ face * 3 + 1 ] ] += sVector[ face ];
avgT[ pIndices[ face * 3 + 1 ] ] += tVector[ face ];
avgS[ pIndices[ face * 3 + 2 ] ] += sVector[ face ];
avgT[ pIndices[ face * 3 + 2 ] ] += tVector[ face ];
}
if ( _FixCylindricalTexGen == FixCylindricalTexGen )
{
for ( unsigned int v = 0; v < IdenticalVertices_.size(); ++v )
{
// go through each vertex & sum up it's true neighbors
for ( std::set< unsigned int >::iterator iter = IdenticalVertices_[ v ].begin();
iter != IdenticalVertices_[ v ].end();
++iter )
{
avgS[ v ] += avgS[ *iter ];
avgT[ v ] += avgT[ *iter ];
}
}
}
Mapping::iterator tangent = outmap.find( "tangent" );
Mapping::iterator binormal = outmap.find( "binormal" );
// now renormalize
for ( unsigned int b = 0; b < positions.size(); b += 3 )
{
D3DXVECTOR3* vecTangent = (D3DXVECTOR3*)&output[ (*tangent).second ].floatVector_[ b ];
D3DXVECTOR3* vecBinormals = (D3DXVECTOR3*)&output[ (*binormal).second ].floatVector_[ b ];
D3DXVec3Normalize( vecTangent, &avgS[ b / 3 ] ); // s
D3DXVec3Normalize( vecBinormals, &avgT[ b / 3 ] ); // T
}
}
// At this point, tex coords, normals, binormals and tangents should be generated if necessary,
// and other attributes are simply copied as available
return true;
}