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Superclass: W3MinneGraphics

An abstract W3Kit base class for 3D rendering via MinneGraphics. This class adds to W3MinneGraphics the ability to compute and render a mouse-picked selection.

The "essential state" includes some of the info about the selection. This saved selection info is maintained in world coords.

- selectMousePoint:(const Point2 *)click ofGeom:(Geom *)geom
- unselect;
Some convenience methods are provided to use the selection for motion and drawing.
- lookTowardSelection;
- incrementalLookTowardSelection:(double)frac;
- renderSelectionCursorRelativeToGeom:(Geom *)geom

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Author: Paul Burchard
Comments to: webmaster@geom.umn.edu
Created: Apr 18 1994 --- Last modified: Jun 18 1996