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need inexpensive graphics package

Does anyone have any knowledge of an inexpensive or public domain graphics
package for the Symbolics which can generate, modify and store 
three-dimensional objects.  The requirements are fairly basic:

	- have both an interactive and programatic interface.
	- be able to generate an object from lists of vertices, edges, and
	- specify the position and orientation of multiple objects in world
	  coordinates and display them simultaneously.
	- specify camera attributes such as focal length (zoom) and angle and
	  point of view.
	- handle clipping adequately.

Any leads will be appreciated.

	Doug Ruth	[ruth@sri-robotx.arpa]