void CModelSurface::Transform( const CMat4 &matrix,const CMat4 &itMatrix ){
for( vector<CVertex>::iterator it=_vertices.begin();it!=_vertices.end();++it ){
CVertex &v=*it;
v.position=matrix * v.position;
v.normal=(itMatrix * CVec4( v.normal,0.0f ) ).xyz().Normalize();
v.tangent=CVec4( (itMatrix * CVec4( v.tangent.xyz(),0.0f ) ).xyz().Normalize(),v.tangent.w );
}
}
void CModelSurface::UpdateTangents(){
vector<CVec3> stangs( _vertices.size() );
vector<CVec3> ttangs( _vertices.size() );
for( vector<CTriangle>::iterator it=_triangles.begin();it!=_triangles.end();++it ){
const CTriangle &tri=*it;
int i0=tri.vertices[0];
int i1=tri.vertices[1];
int i2=tri.vertices[2];
const CVec3 &v0=_vertices[i0].position;
const CVec3 &v1=_vertices[i1].position;
const CVec3 &v2=_vertices[i2].position;
const CVec2 &c0=_vertices[i0].texcoords[0];
const CVec2 &c1=_vertices[i1].texcoords[0];
const CVec2 &c2=_vertices[i2].texcoords[0];
CVec3 side0=v0-v1,side1=v2-v1;
float deltas0=c0.x-c1.x,deltas1=c2.x-c1.x;
float deltat0=c0.y-c1.y,deltat1=c2.y-c1.y;
CVec3 stang=( (side0 * deltat1)-(side1 * deltat0) ).Normalize();
CVec3 ttang=( (side0 * deltas1)-(side1 * deltas0) ).Normalize();
stangs[i0]+=stang;
ttangs[i0]+=ttang;
stangs[i1]+=stang;
ttangs[i1]+=ttang;
stangs[i2]+=stang;
ttangs[i2]+=ttang;
}
for( int i=0;i<_vertices.size();++i ){
const CVec3 &n=_vertices[i].normal;
const CVec3 &t=stangs[i];
CVec3 tang=( t-n*n.Dot(t) ).Normalize();
float w=n.Cross(t).Dot( ttangs[i] )>0 ? 1 : -1;
_vertices[i].tangent=CVec4( tang,w );
}
}
static CModel *cmodel( const aiMesh *mesh ){
CModel *model=new CModel;
const CVec3 scale( .035,.035,.035 );
aiVector3D *mv=mesh->mVertices;
aiVector3D *mn=mesh->mNormals;
aiVector3D *mt=mesh->mTangents;
aiVector3D *mb=mesh->mBitangents;
aiVector3D *mc=mesh->mTextureCoords[0];
for( int i=0;i<mesh->mNumVertices;++i ){
float tw=1.0;
if( mn && mt && mb ){
CVec3 norm=*(CVec3*)mn;
CVec3 tang=*(CVec3*)mt;
CVec3 bitang=*(CVec3*)mb;
if( norm.Dot( tang.Cross(bitang) )<0.0f ) tw=-1.0f;
}
CVertex v;
v.position=scale * *(CVec3*)mv++;
if( mn ) v.normal=*(CVec3*)mn++;
if( mt ) v.tangent=CVec4( *(CVec3*)mt++,tw );
if( mc ) v.texcoords[0]=*(CVec2*)mc++;
model->AddVertex( v );
}
aiFace *face=mesh->mFaces;
for( int i=0;i<mesh->mNumFaces;++i ){
model->AddTriangle( face->mIndices[0],face->mIndices[1],face->mIndices[2] );
++face;
}
// model->UpdateNormals();
model->UpdateTangents();
return model;
}
CVec4 CVec4::operator - (const CVec4& rhs) const
{
glm::vec4 ret = m_data - rhs.m_data;
return CVec4(ret.x, ret.y, ret.z, ret.w);
}
CVec4 CVec4::operator * (float rhs) const
{
glm::vec4 ret = m_data * rhs;
return CVec4(ret.x, ret.y, ret.z, ret.w);
}
CVec4 CVec4::operator * (const CMat4& mat) const
{
glm::vec4 ret = mat.m_data * m_data;
return CVec4(ret.x, ret.y, ret.z, ret.w);
}
