Method IntersectWithLine

Rendering/Core/vtkCellPicker.cxx:269–357

#define VTKCELLPICKER_PLANE_TOL 1e-14

double vtkCellPicker::IntersectWithLine(const double p1[3], const double p2[3], double tol,
  vtkAssemblyPath* path, vtkProp3D* prop, vtkAbstractMapper3D* m)
{
  vtkMapper* mapper = nullptr;
  vtkAbstractVolumeMapper* volumeMapper = nullptr;
  vtkImageMapper3D* imageMapper = nullptr;
  vtkAbstractHyperTreeGridMapper* htgMapper = nullptr;

  double tMin = VTK_DOUBLE_MAX;
  double t1 = 0.0;
  double t2 = 1.0;

  // Clip the ray with the mapper's ClippingPlanes and adjust t1, t2.
  // This limits the pick search to the inside of the clipped region.
  int clippingPlaneId = -1;
  if (m &&
    !vtkCellPicker::ClipLineWithPlanes(
      m, this->Transform->GetMatrix(), p1, p2, t1, t2, clippingPlaneId))
  {
    return VTK_DOUBLE_MAX;
  }

  // Initialize the pick position to the frontmost clipping plane
  if (this->PickClippingPlanes && clippingPlaneId >= 0)
  {
    tMin = t1;
  }

  // HyperTreeGrid
  else if ((htgMapper = vtkAbstractHyperTreeGridMapper::SafeDownCast(m)))
  {
    tMin = this->IntersectHyperTreeGridWithLine(p1, p2, t1, t2, htgMapper);
  }

  // Volume
  else if ((volumeMapper = vtkAbstractVolumeMapper::SafeDownCast(m)))
  {
    tMin = this->IntersectVolumeWithLine(p1, p2, t1, t2, prop, volumeMapper);
  }

  // Image
  else if ((imageMapper = vtkImageMapper3D::SafeDownCast(m)))
  {
    tMin = this->IntersectImageWithLine(p1, p2, t1, t2, prop, imageMapper);
  }

  // Actor
  else if ((mapper = vtkMapper::SafeDownCast(m)))
  {
    tMin = this->IntersectActorWithLine(p1, p2, t1, t2, tol, prop, mapper);
  }

  // Unidentified Prop3D
  else
  {
    tMin = this->IntersectProp3DWithLine(p1, p2, t1, t2, tol, prop, m);
  }