Hello,

The holidays are over. I've started a new project... which has me 
confused. I don't understand POV's behavior.


The attached image illustrates the issue well. Both objects are defined 
in the same way, but one is a union{} (magenta) and the other is a 
merge{} (cyan).

It's a very very simple object: two boxes and four cylinders.


So, why le merged object (in cyan) show a hole ?


<sdl>

#declare S = 11.00;
#declare R = 3.00;
#declare H = 0.50;

#declare corner = cylinder { <0, -H, 0>, <0, 0, 0>, R }

merge or union
   {
   box { <-S+R, -H, -S>, <+S-R, 0, +S> }
   box { <-S, -H, -S+R>, <+S, 0, +S-R> }

   object { corner translate <+(S-R), 0, +(S-R)> }
   object { corner translate <-(S-R), 0, +(S-R)> }
   object { corner translate <+(S-R), 0, -(S-R)> }
   object { corner translate <-(S-R), 0, -(S-R)> }
   }

</sdl>

For the rendering, I added a translate 15*y for the cyan object but the 
problem is not here.



If you have an idea...
Regards



ps : actually, I'm trying to understand how subsurface scattering works, 
and I've already noticed that this feature requires merge{} because 
union{} don't work, certainly due to surface coincidence.



-- 
kurtz le pirate
compagnie de la banquise

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