A sky sphere with multiple colors.
A background with multiple ground and sky colors.
A mountain-panorama background created with the color and pixel transparency parts of a mountain image.
Backgrounds bound and unbound by touching a red cube or a blue sphere.
A Background node presents a virtual sky above and land (or sea, or space) below.
Background nodes describe groundColor and skyColor gradients on the ground hemisphere and sky sphere. Background nodes can also apply panorama images on a panorama box. Of interest is that the viewer can look around and navigate, but never get any closer to the background. Backgrounds are faster to draw than if you used shapes to build them.
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