3D Navigation Essentials
For navigation in the 3d viewport you may use the navigation tools to track, tumble, dolly or look around. Select the appropriate tool in the toolbar and click-and-drag the mouse in the viewport. Alternatively, the navigation modes can be applied at any time in conjunction with a modifier. The default settings are as follows:
- ALT+LMB: Tumble camera around the point of interest.
- ALT+MMB: Track camera parallel to the view plane (through the point of interest), also known as panning.
- ALT+RMB or Mouse Wheel: Dolly the camera towards or away from the point of interest, meaning the distance of the camera to the point of interest is changed while staying on the same axis.
- Arrow Up: Moves the camera forwards horizontally.
Arrow Down: Moves the camera backwards horizontally.
Arrow Left: Moves the camera to the left.
Arrow Right: Moves the camera to the right.
U: Moves the camera up vertically.
J: Moves the camera down vertically.
Pressing SHIFT plus any of above keys increases the speed of the camera movements.
- B: Set Lookaround Mode. The camera's point of rotation is fixed to the current position. This mode can be used for creating bookmarks for 360 VR exports.
In addition, there are a number of operations that make navigation within complex scenes easier:
- F: Frame the selection. The camera's point of interest is placed in the center of the selection and the camera distance is adjusted accordingly. You can also frame the current selection by clicking on the Frame button.
- A: Frame all. The camera's point of interest is placed in the center of all objects and the camera distance is adjusted accordingly.
- N: Turns the camera's view direction towards north while keeping the view angle to the ground.
SHIFT+N: Turns the camera's view direction vertically down and rotates the scene so north is up.
- SPACE: Maximize 3D viewport. The active 3D viewport is maximized and fills the entire CityEngine window. Pressing SPACE again restores the previous window layout.
As a consequence, the typical navigation works by selecting an object via LMB or via drag-LMB and then pressing F to frame the selection. Afterwards the selection can be explored via tumble, track and dolly.
Note: The CityEngine preferences (CTRL since some window managers catch the ALT key.) allow you change the mouse navigation schemes according to the schemes of other 3D applications. Linux users might want to change the modifier key mapping for navigation to
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