Visual Position Extraction Using Stereo Eye Systems with a Relative Rotational Motion Capability by Corwin, Daniel W.

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Logo Turtle Graphics for the Lisp Machine by Lieberman, Henry

“…The graphics system provides: Simple line drawing and erasing using "turtle geometry" Flexible relative and absolute coordinate systems, scaling Floating point coordinates Drawing points, circles, boxes, text Automatically filling closed curves with patterns Saving and restoring pictures rapidly as arrays of points Drawing on color displays, creating new colors Three dimensional perspective drawing, two-color stereo display…”
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