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