6 buttons for rotation around 3 axes. 4 buttons for translation along the horizontal plane. Drop, etc.
2 buttons for movement of camera / rotate the scene. 2 (maybe 4) for movement of light source, as shadows are often helpful. Also point the camera higher or lower?
Show both a 3D view and a stack of 2D cross sections. The latter is needed to see hidden holes. The views rotate in sync as the camera moves.
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