Method ComputeViewPlaneNormal

Rendering/Core/vtkCamera.cxx:1234–1253

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//------------------------------------------------------------------------------
void vtkCamera::ComputeViewPlaneNormal()
{
  if (this->ViewShear[0] != 0.0 || this->ViewShear[1] != 0.0)
  {
    // set the VPN in camera coordinates
    this->ViewPlaneNormal[0] = this->ViewShear[0];
    this->ViewPlaneNormal[1] = this->ViewShear[1];
    this->ViewPlaneNormal[2] = 1.0;
    // transform the VPN to world coordinates using inverse of view transform
    this->ViewTransform->GetLinearInverse()->TransformNormal(
      this->ViewPlaneNormal, this->ViewPlaneNormal);
  }
  else
  {
    // VPN is -DOP
    this->ViewPlaneNormal[0] = -this->DirectionOfProjection[0];
    this->ViewPlaneNormal[1] = -this->DirectionOfProjection[1];
    this->ViewPlaneNormal[2] = -this->DirectionOfProjection[2];
  }
}

//------------------------------------------------------------------------------
// Return the 6 planes (Ax + By + Cz + D = 0) that bound