Method SetupCamera

Common/Transforms/vtkPerspectiveTransform.cxx:394–432

------------------------------------------------------------------------------

//------------------------------------------------------------------------------
void vtkPerspectiveTransform::SetupCamera(
  const double position[3], const double focalPoint[3], const double viewUp[3])
{
  double matrix[4][4];
  vtkMatrix4x4::Identity(*matrix);

  // the view directions correspond to the rows of the rotation matrix,
  // so we'll make the connection explicit
  double* viewSideways = matrix[0];
  double* orthoViewUp = matrix[1];
  double* viewPlaneNormal = matrix[2];

  // set the view plane normal from the view vector
  viewPlaneNormal[0] = position[0] - focalPoint[0];
  viewPlaneNormal[1] = position[1] - focalPoint[1];
  viewPlaneNormal[2] = position[2] - focalPoint[2];
  vtkMath::Normalize(viewPlaneNormal);

  // orthogonalize viewUp and compute viewSideways
  vtkMath::Cross(viewUp, viewPlaneNormal, viewSideways);
  vtkMath::Normalize(viewSideways);
  vtkMath::Cross(viewPlaneNormal, viewSideways, orthoViewUp);

  // translate by the vector from the position to the origin
  double delta[4];
  delta[0] = -position[0];
  delta[1] = -position[1];
  delta[2] = -position[2];
  delta[3] = 0.0; // yes, this should be zero, not one

  vtkMatrix4x4::MultiplyPoint(*matrix, delta, delta);

  matrix[0][3] = delta[0];
  matrix[1][3] = delta[1];
  matrix[2][3] = delta[2];

  // apply the transformation
  this->Concatenate(*matrix);
}

void vtkPerspectiveTransform::SetupCamera(double p0, double p1, double p2, double fp0, double fp1,
  double fp2, double vup0, double vup1, double vup2)