There are different ways in which the model can be view .. ALT+SHIFT and move movement, the tumble icon and the new view box. The tumble icon tumblewas the first one to appear in Alias and has some special function. With the left mouse button pressed in the icon the model can be viewed in all directions. With middle mouse button pressed, the viewpoint will rotate around the Z axis  and with right mouse button the viewpoint will rotate around the horizontal axis.

This method can be used to check quality of lines/curves and their relation by parallel ax method.

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