GLuint TexCoordinates(std::vector<T>& dest) const
{
unsigned k = 0, n = _vertex_count();
dest.resize(n * 2);
T uc, vc = T(0);
T ustep = T(1) / _udiv;
T vstep = T(1) / _vdiv;
unsigned leap = _udiv+1;
for(unsigned j=0; j!=(_vdiv+1); ++j)
{
uc = T(0);
for(unsigned i=0; i!=leap; ++i)
{
dest[k++] = T(uc);
dest[k++] = T(vc);
uc += ustep;
}
vc += vstep;
}
assert(k == dest.size());
// 2 values per vertex
return 2;
}
GLuint Positions(std::vector<T>& dest) const
{
unsigned k = 0, n = _vertex_count();
dest.resize(n * 3);
Vec3f pos(_point - _u - _v);
Vec3f ustep(_u * (2.0 / _udiv));
Vec3f vstep(_v * (2.0 / _vdiv));
unsigned leap = _udiv+1;
for(unsigned j=0; j!=(_vdiv+1); ++j)
{
Vec3f tmp = pos;
for(unsigned i=0; i!=leap; ++i)
{
dest[k++] = T(tmp.x());
dest[k++] = T(tmp.y());
dest[k++] = T(tmp.z());
tmp += ustep;
}
pos += vstep;
}
assert(k == dest.size());
return 3;
}
GLuint TexCoordinates(std::vector<T>& dest) const
{
unsigned k = 0, n = _vertex_count();
dest.resize(n * 2);
T ustep = T(1) / _udiv;
T vstep = T(1) / _vdiv;
for(unsigned i=0; i<(_udiv+1); ++i)
{
dest[k++] = T(ustep*i);
dest[k++] = T(0);
dest[k++] = T(ustep*i);
dest[k++] = T(1);
}
for(unsigned j=1; j<(_vdiv); ++j)
{
dest[k++] = T(0);
dest[k++] = T(vstep*j);
dest[k++] = T(1);
dest[k++] = T(vstep*j);
}
assert(k == dest.size());
// 2 values per vertex
return 2;
}
GLuint Bitangents(std::vector<T>& dest) const
{
unsigned k = 0, n = _vertex_count();
dest.resize(n * 3);
Vec3f bitangent(Normalized(_v));
for(unsigned i=0; i!=n; ++i)
{
dest[k++] = T(bitangent.x());
dest[k++] = T(bitangent.y());
dest[k++] = T(bitangent.z());
}
//
assert(k == dest.size());
// 3 values per vertex
return 3;
}
GLuint Normals(std::vector<T>& dest) const
{
unsigned k = 0, n = _vertex_count();
dest.resize(n * 3);
Vec3f normal = Normal();
for(unsigned i=0; i!=n; ++i)
{
dest[k++] = T(normal.x());
dest[k++] = T(normal.y());
dest[k++] = T(normal.z());
}
//
assert(k == dest.size());
// 3 values per vertex
return 3;
}
GLuint Positions(std::vector<T>& dest) const
{
unsigned k = 0, n = _vertex_count();
dest.resize(n * 3);
const Vec3f pos(_point - _u - _v);
const Vec3f ustep(_u * (2.0 / _udiv));
const Vec3f vstep(_v * (2.0 / _vdiv));
for(unsigned i=0; i<(_udiv+1); ++i)
{
Vec3f tmp = pos+ustep*i;
dest[k++] = T(tmp.x());
dest[k++] = T(tmp.y());
dest[k++] = T(tmp.z());
tmp += 2.0*_v;
dest[k++] = T(tmp.x());
dest[k++] = T(tmp.y());
dest[k++] = T(tmp.z());
}
for(unsigned j=1; j<(_vdiv); ++j)
{
Vec3f tmp = pos+vstep*j;
dest[k++] = T(tmp.x());
dest[k++] = T(tmp.y());
dest[k++] = T(tmp.z());
tmp += 2.0*_u;
dest[k++] = T(tmp.x());
dest[k++] = T(tmp.y());
dest[k++] = T(tmp.z());
}
assert(k == dest.size());
return 3;
}
