Felix Wiemann wrote:

> This creates a text engraved into a plane. (Please note that a plane is
> a solid object.) "Signet Roundhand" is a handwriting-like font, so the
> letters are big and overlap each other.


> But the left part of the letter "P" is cut of. It seems to be a
> bounding problem.


Confirmed.  And reproducible with "timrom".

> And where the letters overlap, there are many "noisy
> pixels".


Coincident surfaces, maybe?

-- 
/*Francois Labreque*/#local a=x+y;#local b=x+a;#local c=a+b;#macro P(F//
/*    flabreque    */L)polygon{5,F,F+z,L+z,L,F pigment{rgb 9}}#end union
/*        @        */{P(0,a)P(a,b)P(b,c)P(2*a,2*b)P(2*b,b+c)P(b+c,<2,3>)
/*   videotron.ca  */}camera{location<6,1.25,-6>look_at a orthographic}

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