void ModelClass::CalculateTangentBinormal(TempVertexType vt1, TempVertexType vt2, TempVertexType vt3, VectorType &tangent, VectorType &binormal)
{
float vec1[3], vec2[3];
float tuVec[2], tvVec[2];
float den;
float length;
vec1[0] = vt2.pos_x - vt1.pos_x;
vec1[1] = vt2.pos_y - vt2.pos_y;
vec1[2] = vt2.pos_z - vt1.pos_z;
vec2[0] = vt3.pos_x - vt1.pos_x;
vec2[1] = vt3.pos_y - vt1.pos_y;
vec2[2] = vt3.pos_z - vt1.pos_z;
tuVec[0] = vt2.tex_u - vt1.tex_u;
tvVec[0] = vt2.tex_v - vt1.tex_v;
tuVec[1] = vt3.tex_u - vt1.tex_u;
tvVec[1] = vt3.tex_v - vt1.tex_v;
den = 1.0f / (tuVec[0] * tvVec[1] - tuVec[1] * tvVec[0]);
tangent.x = (tvVec[1] * vec1[0] - tvVec[0] * vec2[0]) * den;
tangent.y = (tvVec[1] * vec1[1] - tvVec[0] * vec2[1]) *den;
tangent.z = (tvVec[1] * vec1[2] - tvVec[0] * vec2[2]) *den;
binormal.x = (tuVec[0] * vec2[0] - tuVec[1] * vec1[0]) * den;
binormal.y = (tuVec[0] * vec2[1] - tuVec[1] * vec1[1])*den;
binormal.z = (tuVec[0] * vec2[2] - tuVec[1] * vec1[2])*den;
normalizeVertex(tangent);
normalizeVertex(binormal);
}
void ModelClass::CalculateNormal(VectorType tangent, VectorType binormal, VectorType &normal)
{
float length;
normal.x = tangent.y*binormal.z - tangent.z*binormal.y;
normal.y = tangent.z*binormal.x - tangent.x*binormal.z;
normal.z = tangent.x*binormal.y - tangent.y*binormal.x;
normalizeVertex(normal);
}
void Mesh::end()
{
switch ((m_blocks.end()-1)->normal) {
case VERTEX:
normalizeVertex(*(m_blocks.end()-1));
break;
case FACE:
normalizeFaces(*(m_blocks.end()-1));
break;
default:
break;
}
}