Options for light source and environment and reflection maps for 3D viewports may be configured using the Scene Light and Panorama tool . You can access the tool the following ways:
- Click the Scene Light and Panorama tool on the toolbar.
- Click Edit > Edit Scene Light and Panorama in the main menu.
The Light parameters control how objects are lit in the Viewport:
Sun position source
Switches between Time and Month and Direct Solar Entry. For Time and Month to work, the Scene Coordinate System must be set correctly.
Time of sun position.
Time zone of sun position.
Month of sun position.
Solar elevation angle
Altitude of the sun, the angle between the horizon and the center of the sun's disc.
Solar azimuth angle
Azimuth angle of the sun.
Scene light intensity.
Scene light ambient intensity.
Attenuation of shadows (blend to black).
Ambient occlusion attenuation
Attenuation of screen space ambient occlusion (blend to black).
Switches between Low, Medium, High, and Interactive.
Switches between Manual and Interactive.
Ambient occlusion radius
Radius in meters of screen space ambient occlusion samples.
Ambient occlusion samples
Number of screen space ambient occlusion samples, or Interactive.
The Interactive modes are designed to deliver great visual quality without the need to manually adjust parameters.
- When Shadow quality or Ambient occlusion samples are set to Interactive, the best visual quality is used when the camera stands still, while the quality is reduced based on performance when the camera moves.
- When setting Radius mode to interactive, the ambient occlusion radius is automatically adjusted for best visual quality in the center region of the viewport. To tweak this, set the mode to Manual.
CityEngine ambient occlusion uses screen space ambient occlusion, a special real-time rendering technique that approximates ambient light occlusion. Ambient occlusion is a shading method used in 3D computer graphics that helps add realism by taking into account attenuation of light due to occlusion. Ambient occlusion attempts to approximate the way light radiates in real life and is especially well suited for outdoor scenes.
The panorama settings contain the background skydome shown in the 3D viewports:
Show or hide the panorama.
The directory ce.lib/maps/panoramas contains a selection of panorama maps.