To Walk Through a Model
1. Click View > Saved Orientations > Reorient. The View dialog box opens.
2. On the Perspective dialog box, in the Type, select Walk Through.
3. Do one of the following:
SHIFT+Middle-click and drag to pan the model.
Middle-click and drag to spin the model.
CTRL+Middle-click and drag in the vertical direction to zoom the model
CTRL+Middle-click and drag in the horizontal direction to spin the model perpendicular to the plane of the screen.
4. Click OK. The View dialog box closes and walk-through session end.