Interact in the camera view. The observer view draws that
camera's position, focal point, view-up, direction of projection and near/far clipping
planes; the panel lists every parameter, matrix and viewport value live.
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1 · Observer view camera drawn as geometry | drag left btn to orbit | drag middle btn to pan
2 · Camera view vtkPartitionedDataSetCollectionSource | drag left btn to orbit | drag middle btn to pan