An example of a viewport rendering. The entire canvas is being rendered with a view of a virtual world, while a second rendering is being placed into a lower-right viewport.

Please use a browser that supports "canvas"
Manipulate the parameters of the createPerspective(fovy,aspect,near,far) function:

fovy   : 5.0 179 Field-of-view (y axis) = 45 degrees
aspect : 0.1 5.0 aspect = 1.00 (width/height)
Change canvas size to match aspect ratio.
near   : 0.1 10.0 near = 1.0
far    : 2.0 20.0 far = 10.0