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vtkHomogeneousTransform.cxx
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vtkHomogeneousTransform.cxx
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/*=========================================================================
Program: Visualization Toolkit
Module: vtkHomogeneousTransform.cxx
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
#include "vtkHomogeneousTransform.h"
#include "vtkMath.h"
#include "vtkMatrix4x4.h"
#include "vtkPoints.h"
//----------------------------------------------------------------------------
vtkHomogeneousTransform::vtkHomogeneousTransform()
{
this->Matrix = vtkMatrix4x4::New();
}
//----------------------------------------------------------------------------
vtkHomogeneousTransform::~vtkHomogeneousTransform()
{
if (this->Matrix)
{
this->Matrix->Delete();
}
}
//----------------------------------------------------------------------------
void vtkHomogeneousTransform::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os, indent);
os << indent << "Matrix: (" << this->Matrix << ")\n";
if (this->Matrix)
{
this->Matrix->PrintSelf(os, indent.GetNextIndent());
}
}
//------------------------------------------------------------------------
template <class T1, class T2, class T3>
inline double vtkHomogeneousTransformPoint(T1 M[4][4],
T2 in[3], T3 out[3])
{
double x = M[0][0]*in[0] + M[0][1]*in[1] + M[0][2]*in[2] + M[0][3];
double y = M[1][0]*in[0] + M[1][1]*in[1] + M[1][2]*in[2] + M[1][3];
double z = M[2][0]*in[0] + M[2][1]*in[1] + M[2][2]*in[2] + M[2][3];
double w = M[3][0]*in[0] + M[3][1]*in[1] + M[3][2]*in[2] + M[3][3];
double f = 1.0/w;
out[0] = static_cast<T3>(x*f);
out[1] = static_cast<T3>(y*f);
out[2] = static_cast<T3>(z*f);
return f;
}
//------------------------------------------------------------------------
// computes a coordinate transformation and also returns the Jacobian matrix
template <class T1, class T2, class T3, class T4>
inline void vtkHomogeneousTransformDerivative(T1 M[4][4],
T2 in[3], T3 out[3],
T4 derivative[3][3])
{
double f = vtkHomogeneousTransformPoint(M,in,out);
for (int i = 0; i < 3; i++)
{
derivative[0][i] = static_cast<T4>((M[0][i] - M[3][i]*out[0])*f);
derivative[1][i] = static_cast<T4>((M[1][i] - M[3][i]*out[1])*f);
derivative[2][i] = static_cast<T4>((M[2][i] - M[3][i]*out[2])*f);
}
}
//------------------------------------------------------------------------
void vtkHomogeneousTransform::InternalTransformPoint(const float in[3],
float out[3])
{
vtkHomogeneousTransformPoint(this->Matrix->Element,in,out);
}
//------------------------------------------------------------------------
void vtkHomogeneousTransform::InternalTransformPoint(const double in[3],
double out[3])
{
vtkHomogeneousTransformPoint(this->Matrix->Element,in,out);
}
//----------------------------------------------------------------------------
void vtkHomogeneousTransform::InternalTransformDerivative(const float in[3],
float out[3],
float derivative[3][3])
{
vtkHomogeneousTransformDerivative(this->Matrix->Element,in,out,derivative);
}
//----------------------------------------------------------------------------
void vtkHomogeneousTransform::InternalTransformDerivative(const double in[3],
double out[3],
double derivative[3][3])
{
vtkHomogeneousTransformDerivative(this->Matrix->Element,in,out,derivative);
}
//----------------------------------------------------------------------------
void vtkHomogeneousTransform::TransformPoints(vtkPoints *inPts,
vtkPoints *outPts)
{
vtkIdType n = inPts->GetNumberOfPoints();
double (*M)[4] = this->Matrix->Element;
double point[3];
this->Update();
for (int i = 0; i < n; i++)
{
inPts->GetPoint(i,point);
vtkHomogeneousTransformPoint(M,point,point);
outPts->InsertNextPoint(point);
}
}
//----------------------------------------------------------------------------
// Transform the normals and vectors using the derivative of the
// transformation. Either inNms or inVrs can be set to nullptr.
// Normals are multiplied by the inverse transpose of the transform
// derivative, while vectors are simply multiplied by the derivative.
// Note that the derivative of the inverse transform is simply the
// inverse of the derivative of the forward transform.
void vtkHomogeneousTransform::TransformPointsNormalsVectors(vtkPoints *inPts,
vtkPoints *outPts,
vtkDataArray *inNms,
vtkDataArray *outNms,
vtkDataArray *inVrs,
vtkDataArray *outVrs)
{
vtkIdType n = inPts->GetNumberOfPoints();
double (*M)[4] = this->Matrix->Element;
double L[4][4];
double inPnt[3],outPnt[3],inNrm[3],outNrm[3],inVec[3],outVec[3];
double w;
this->Update();
if (inNms)
{ // need inverse of the matrix to calculate normals
vtkMatrix4x4::DeepCopy(*L,this->Matrix);
vtkMatrix4x4::Invert(*L,*L);
vtkMatrix4x4::Transpose(*L,*L);
}
for (int i = 0; i < n; i++)
{
inPts->GetPoint(i,inPnt);
// do the coordinate transformation, get 1/w
double f = vtkHomogeneousTransformPoint(M,inPnt,outPnt);
outPts->InsertNextPoint(outPnt);
if (inVrs)
{
inVrs->GetTuple(i,inVec);
// do the linear homogeneous transformation
outVec[0] = M[0][0]*inVec[0] + M[0][1]*inVec[1] + M[0][2]*inVec[2];
outVec[1] = M[1][0]*inVec[0] + M[1][1]*inVec[1] + M[1][2]*inVec[2];
outVec[2] = M[2][0]*inVec[0] + M[2][1]*inVec[1] + M[2][2]*inVec[2];
w = M[3][0]*inVec[0] + M[3][1]*inVec[1] + M[3][2]*inVec[2];
// apply homogeneous correction: note that the f we are using
// is the one we calculated in the point transformation
outVec[0] = (outVec[0]-w*outPnt[0])*f;
outVec[1] = (outVec[1]-w*outPnt[1])*f;
outVec[2] = (outVec[2]-w*outPnt[2])*f;
outVrs->InsertNextTuple(outVec);
}
if (inNms)
{
inNms->GetTuple(i,inNrm);
// calculate the w component of the normal
w = -(inNrm[0]*inPnt[0] + inNrm[1]*inPnt[1] + inNrm[2]*inPnt[2]);
// perform the transformation in homogeneous coordinates
outNrm[0] = L[0][0]*inNrm[0]+L[0][1]*inNrm[1]+L[0][2]*inNrm[2]+L[0][3]*w;
outNrm[1] = L[1][0]*inNrm[0]+L[1][1]*inNrm[1]+L[1][2]*inNrm[2]+L[1][3]*w;
outNrm[2] = L[2][0]*inNrm[0]+L[2][1]*inNrm[1]+L[2][2]*inNrm[2]+L[2][3]*w;
// re-normalize
vtkMath::Normalize(outNrm);
outNms->InsertNextTuple(outNrm);
}
}
}
//----------------------------------------------------------------------------
// update and copy out the current matrix
void vtkHomogeneousTransform::GetMatrix(vtkMatrix4x4 *m)
{
this->Update();
m->DeepCopy(this->Matrix);
}
//----------------------------------------------------------------------------
void vtkHomogeneousTransform::InternalDeepCopy(vtkAbstractTransform *transform)
{
vtkHomogeneousTransform *t =
static_cast<vtkHomogeneousTransform *>(transform);
this->Matrix->DeepCopy(t->Matrix);
}