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Improved comments to the interpolation function that requires a preferential axis

This commit is contained in:
Paolo Cignoni 2011-11-21 08:02:31 +00:00
parent 62167e43bf
commit 20ec79715b
1 changed files with 8 additions and 7 deletions
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15
vcg/space/triangle3.h
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@ -106,18 +106,19 @@ Point3Type NormalizedNormal( Point3Type const &p0, Point3Type const & p1, Point
// The function to computing barycentric coords of a point inside a triangle.
// it requires the knowledge of what is the direction that is more orthogonal to the face plane.
// Usually this info can be stored in a bit of the face flags (see updateFlags::FaceProjection(MeshType &m) )
// and accessing the field with
// if(fp->Flags() & FaceType::NORMX ) axis = 0;
// else if(fp->Flags() & FaceType::NORMY ) axis = 1;
// else axis =2;
// InterpolationParameters(*fp,axis,Point,L);
// ScalarType nx = math::Abs((*fi).cN()[0]);
// ScalarType ny = math::Abs((*fi).cN()[1]);
// ScalarType nz = math::Abs((*fi).cN()[2]);
// if(nx>ny && nx>nz) { axis = 0; }
// else if(ny>nz) { axis = 1 }
// else { axis = 2 }
// InterpolationParameters(*fp,axis,Point,L);
//
// This normal direction is used to project the triangle in 2D and solve the problem in 2D where it is simpler and often well defined.
template<class TriangleType, class ScalarType>
bool InterpolationParameters(const TriangleType t, const int Axis, const Point3<ScalarType> & P, Point3<ScalarType> & L)
{
Point2<ScalarType> test;
typedef Point2<ScalarType> P2;
if(Axis==0) return InterpolationParameters2( P2(t.P(0)[1],t.P(0)[2]), P2(t.P(1)[1],t.P(1)[2]), P2(t.P(2)[1],t.P(2)[2]), P2(P[1],P[2]), L);
if(Axis==1) return InterpolationParameters2( P2(t.P(0)[0],t.P(0)[2]), P2(t.P(1)[0],t.P(1)[2]), P2(t.P(2)[0],t.P(2)[2]), P2(P[0],P[2]), L);