Among other things, Mike Williams wrote:

>>However, if I manually bound each letter inside the TEXT union, render
>>time goes from 180 to 18 minutes (True Type Font test percentage: 44%). I
>>thought they would have been automatically bounded, since they are inside
>>a union...
> 
> POV automatic bounding works for unions, but it doesn't work for
> differences, which is basically the whole point of the holes tutorial
> page I mentioned.

I see, I expected it to work for unions inside a difference too.

-- 
light_source{9+9*x,1}camera{orthographic look_at(1-y)/4angle 30location
9/4-z*4}light_source{-9*z,1}union{box{.9-z.1+x clipped_by{plane{2+y-4*x
0}}}box{z-y-.1.1+z}box{-.1.1+x}box{.1z-.1}pigment{rgb<.8.2,1>}}//Jellby

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