Method GetKeyMatrices

Rendering/VR/vtkVRHMDCamera.cxx:60–139

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//------------------------------------------------------------------------------
void vtkVRHMDCamera::GetKeyMatrices(vtkRenderer* ren, vtkMatrix4x4*& wcvc, vtkMatrix3x3*& normMat,
  vtkMatrix4x4*& vcdc, vtkMatrix4x4*& wcdc)
{
  if (ren->GetSelector())
  {
    this->Superclass::GetKeyMatrices(ren, wcvc, normMat, vcdc, wcdc);
    return;
  }

  // has the camera changed?
  if (ren != this->LastRenderer || this->MTime > this->KeyMatrixTime ||
    ren->GetMTime() > this->KeyMatrixTime)
  {
    vtkVRRenderWindow* win = vtkVRRenderWindow::SafeDownCast(ren->GetRenderWindow());

    // on left eye render we compute the NormalMatrix, this should be fairly
    // accurate for both eyes.
    if (this->LeftEye)
    {
      this->UpdateWorldToEyeMatrices(ren);
      this->UpdateEyeToProjectionMatrices(ren);

      vtkMatrix4x4* w2v = this->GetModelViewTransformMatrix();
      this->WCVCMatrix->DeepCopy(w2v);

      // only compute normal matrix once
      for (int i = 0; i < 3; ++i)
      {
        for (int j = 0; j < 3; ++j)
        {
          this->NormalMatrix->SetElement(i, j, w2v->GetElement(i, j));
        }
      }
      this->NormalMatrix->Invert();
    }

    if (this->LeftEye)
    {
      this->SetCameraFromWorldToDeviceMatrix(this->WorldToLeftEyeMatrix, win->GetPhysicalScale());
      this->ModelViewTransform->SetMatrix(this->WorldToLeftEyeMatrix);
      this->WCVCMatrix->DeepCopy(this->WorldToLeftEyeMatrix);
      this->WCVCMatrix->Transpose();

      vtkMatrix4x4::Multiply4x4(
        this->LeftEyeToProjectionMatrix, this->WorldToLeftEyeMatrix, this->WCDCMatrix);
      this->WCDCMatrix->Transpose();

      vtkMatrix4x4::Multiply4x4(this->LeftEyeToProjectionMatrix, this->PhysicalToLeftEyeMatrix,
        this->PhysicalToProjectionMatrixForLeftEye);

      this->VCDCMatrix->DeepCopy(this->LeftEyeToProjectionMatrix);
      this->VCDCMatrix->Transpose();
    }
    else
    {
      this->SetCameraFromWorldToDeviceMatrix(this->WorldToRightEyeMatrix, win->GetPhysicalScale());
      this->ModelViewTransform->SetMatrix(this->WorldToRightEyeMatrix);
      this->WCVCMatrix->DeepCopy(this->WorldToRightEyeMatrix);