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greg |
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{ RCSid $Id$ } |
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greg |
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Uses gensurf to compute CRT geometry based on spherical assumption. |
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Author: |
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Greg Ward 11/13/95 |
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Input: |
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w: screen width (total) |
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h: screen height (total) |
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d: displacement from center tangent at max. right or left |
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Usage: |
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gensurf mat name 'x(s,t)' 'y(s,t)' 'z(s,t)' N M -s \ |
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-e 'w:{width};h:{height};d:{depth}' -f screen.cal |
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Output is oriented vertically, with the lower left corner at |
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(x,y,z)=(0,0,0), the lower right at (w,0,0), the upper right |
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at (w,0,h), and the screen bulge in the negative y direction. |
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Surface normals face negative y, also. |
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} |
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{ compute sphere radius } |
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r : d/2 + w*w/8/d; |
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{ compute x and z } |
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x(s,t) = w*s; |
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z(s,t) = h*t; |
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sq(x) : x*x; |
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{ compute maximum depth (y) value } |
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dmax : sqrt(r*r - sq(w/2) - sq(h/2)); |
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{ compute y } |
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y(s,t) = dmax - sqrt(r*r - sq(w*s-w/2) - sq(h*t-h/2)); |
