| Default perspective | Defines the perspective angle when in perspective mode.
In perspective mode, actor sizes depend on their distance from the camera viewpoint. Perspective mode is the view normally seen by the eye. Parallel lines recede into the distance to a vanishing point.
 |  | | 45 degrees | 180 degrees |
Orthogonal mode eliminates the effect of distance from the camera (actor sizes remain constant). |
| Minimum FPS | Defines the minimum number of frames per second (fps), between 0 and 30. During navigation, the 3D kernel adapts the level of detail to respect the fps. |
| Free rotation (no constraints)
| Eliminates vertical constraint during rotation.
|
| Inertia | Causes the camera to continue moving after rotating or panning the model. The faster you rotate or pan the model, the more it moves when you stop. |
| Navigation mode common to all viewport panes
| Uses the same navigation mode for all panes of a document viewport. To use different modes (for example, to use
Rotate Mode in one pane and
Pan Mode in another), clear this option.
Note:
This option does not affect viewports of different documents.
|
| Volatile navigation mode (auto-revert to selection mode) | Enables
Select Mode automatically after using another mode (
Pan,
Rotate,
Zoom). To retain the last mode you selected, clear this option. |
| Keyboard navigation | Enables the Pan increment and Rotate and roll increment options, which let you specify the increment values used to pan, rotate, and roll using keyboard shortcuts. |
| Pan increment | Specifies the increment value used to pan using
Ctrl+arrow keys. The default value is 5 pixels. |
| Rotate and roll increment | Specifies the increment value used to rotate using
Shift+arrow keys and to roll using
Alt+arrow keys. The default value is 1.00 degree. |