[pstricks] clipping in 3d

Zbigniew Nitecki zbigniew.nitecki at tufts.edu
Tue Mar 17 15:50:19 CET 2009

I tried clipping, but there's something I don't understand.  In the  
example below, I first want to plot the surface
z=-xy, but only inside the cylinder x^2 +y^2 \leq 2.25.  I used the  
circle centered at the origin with radius 1.5 as the clipping curve.   
Then I plotted what should be the boundary curve for this surface,  
using \parametricplot3D.
The output is attached.  Why the discrepancy?

Example based on Herbert's example from 11/24/2008:

			\pstThreeDCoor[xMin=-2, xMax=2, yMin=-2,yMax=2, zMin=0, zMax=2]
					x y mul neg%
			\parametricplotThreeD[linewidth=1.2pt, xPlotpoints=200](0,360){%
				1.5 t cos mul %
				1.5 t sin mul %
				t cos t sin mul 1.5 mul neg%

Zbigniew Nitecki
Department of Mathematics
Tufts University
Medford, MA 02155

Office    (617)627-3843
Dept.    (617)627-3234
Dept. fax    (617)627-3966

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