\Draw  % perspective proj
 \ThreeDim(-150,-60,-600)
    ... \LineTo(0,60,0) ...
    \LineAt(0,60,0,0,60,60)
    \Line(0,-60,0)
 \EndThreeDim \EndDraw \Draw
 \Scale(2.5,1.5)
 \ThreeDim(80,70,-40)
    ...  % 3D + rotated axes
 \EndThreeDim \EndDraw \Draw
 \ThreeDim(40,-60)
    ...  % parallel proj
 \EndThreeDim \EndDraw