Okay, so i've got this image, and i was hoping to do a difference of the
back wall (a union of these mesh bricks) with a cylinder-cube union to cut
away the wall, leaving an archway. now the bricks in the wall are individual
bricks, not a texture. the original brick was a rounded cube kind of thing i
made in Ray Dream, then exported with 3dWin4 to pov format.

i tried the difference, getting a warning message about patches not usable
in intersections, but it proceeded to start rendering. at an insanely slow
rate. So i was wondering, is there a way to keep the brick as a mesh, and
use the cylinder-cube union object in some way to dictate where not to place
a brick?

on the other hand, if i use a regular primitive box object instead of a mesh
for the bricks, i could do a difference that would be more successfull (in
terms of rendering speed), right?

i've posted the image in the binaries.images group for reference under the
"making an archway" subject. i'm using the 3.5 beta verison of povray.

thanks,
ross

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