Pro Engineer/View

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The view of a model can be manipulated using only the middle mouse button of a scrolling mouse.

Pressing the middle mouse button (MMB) and dragging the cursor will spin the model. The action is analogous to placing your hand on the model and rolling it across the background - the near part of the model moves with the cursor.

Using the scroll wheel zooms in and out. Scrolling down pulls the MODEL towards you - imagine pulling the scroll wheel towards you - and scrolling up does the opposite. (This action is the opposite of many applications like online maps programs, and even other CAD programs).

You can also use the scroll wheel to pan, but this takes some practice. Move the cursor to the side of the screen you want to pan away from & zoom out (scroll up), then move the cursor to the other side of the screen and zoom in (scroll down).