Am 24.07.2012 02:52, schrieb Chaanakya:

> I have a problem.  When I cut a chunk out of the sphere, it still has a circular
> base.  I would like a square base.  How would I achieve that?

So if I understand you correctly, what you want is something that is 
square at the base, but rounded at the top?

Would this one fit your needs (talking of basic shapes here, not exact 
measurements)?

-------------------------------------
#version 3.6;
#include "colors.inc"

global_settings {
   max_trace_level 256
   ambient_light White * 0.1
   assumed_gamma 1.0
}

camera {
   location <10,10,3>
   look_at <0,0,0>
   angle 25
}

light_source {
   <100,1000,0>
   color White
}

/*
#declare RADIUS = 2;
#declare YHEIGHT = RADIUS - sqrt(RADIUS*RADIUS - 2);
*/

#declare YHEIGHT = 0.5;
#declare RADIUS = 1/YHEIGHT + YHEIGHT/2;

intersection {
   box { <-1,0,-1>, <1,YHEIGHT+RADIUS,1> }
   sphere { <0,YHEIGHT-RADIUS,0>, RADIUS }
   pigment { color Red }
}
-------------------------------------

This gives you a cut-sphere dome over a square base, with the corners 
"resting" at y=0 and the apex reaching up to y=YHEIGHT (radius of the 
sphere is computed automatically); alternatively, you can specify the 
radius of the sphere (apex height is computed automatically), see 
commented-out lines.

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