Method UpdateCamera

Rendering/WebGPU/vtkWebGPUComputeFrustumCuller.cxx:255–285

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//------------------------------------------------------------------------------
void vtkWebGPUComputeFrustumCuller::UpdateCamera(vtkRenderer* renderer)
{
  vtkCamera* camera = renderer->GetActiveCamera();
  // Getting the view-projection matrix
  vtkMatrix4x4* viewMatrix = camera->GetModelViewTransformMatrix();

  // We're using [0, 1] for znear and zfar here to align with WebGPU convention
  vtkMatrix4x4* projectionMatrix =
    camera->GetProjectionTransformMatrix(renderer->GetTiledAspectRatio(), 0, 1);
  vtkNew<vtkMatrix4x4> viewProj;
  vtkMatrix4x4::Multiply4x4(projectionMatrix, viewMatrix, viewProj);
  // WebGPU uses column major matrices but VTK is row major
  viewProj->Transpose();

  // Getting the matrix data as floats
  std::vector<float> matrixData(16);
  for (int i = 0; i < 16; i++)
  {
    matrixData[i] = static_cast<float>(viewProj->GetData()[i]);
  }

  // Creating / updating the view-proj matrix uniform buffer
  if (this->CameraViewProjMatrixBufferIndex == -1)
  {
    this->CreateViewProjMatrixBuffer(matrixData);
  }
  else
  {
    this->FrustumCullingPass->UpdateBufferData(this->CameraViewProjMatrixBufferIndex, matrixData);
  }
}

//------------------------------------------------------------------------------
void vtkWebGPUComputeFrustumCuller::OutputObjectCountMapCallback(