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compressed PostScript file nice.perspective.ps.gz PDF file

2.Godfried T. Toussaint, "The complexity of computing nice viewpoints of objects in space," Keynote Address, Vision Geometry IX, Proc. SPIE International Symposium on Optical Science and Technology, 30 July to 4 August 2000, San Diego, California.
compressed PostScript fileviewpoints.ps.gz PDF file

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5. Perspective projection: http://www.maths.uwa.edu.au/~csaba/2GA2/linear_perspective.html