I can see this working, but won't the differencing make the scene a lot slower?

sig.

Eric Freeman wrote:
> 
> "Sigmund Kyrre Aas" <as### [at] studntnuno> wrote in message
> news:38B02C3E.D0BC1000@stud.ntnu.no...
> >
> > Nice tutorial, but it didn't solve my problem.
> >
> > Now I've tried material maps too, but I get the
> > same message when I try to use them in layers:
> > "Cannot layer a patterned texture over another"
> >
> > sig.
> 
> Here's a code snippet from a drinking glass I made using a different
> technique.  Basically you create a second object (slightly larger than the
> original and hollow), apply the logo image map to it, and chop off the back
> half by differencing it with a box.
> 
> // make a drinking glass from the difference
> // of two cylinders
> #declare GlassMain = difference {
>   cylinder {
>     <0,0,0>,
>     <0,Hite,0>
>     Rad
>   }
>   cylinder {
>     <0,0.1,0>,
>     <0,Hite+1,0>
>     Rad*0.9
>   }
>   material {GlassMat}
> }
> 
> // make another hollow cylinder with a slightly larger
> // radius than the drinking glass and chop off the back
> // of it by differencing it with a box
> #declare Logo = difference {
>   cylinder { // main cylinder
>     <0, -0.7, 0>,
>     <0,  0.7, 0>
>     Rad+0.00002
>   }
>   cylinder { // cut-out
>     <0,-0.71,0>,
>     <0,0.71,0>
>     Rad+0.00001
>   }
>   box { // chop off the back half of the cylinder
>     <-Rad-0.1,-0.71,0>,
>     <Rad+0.1,0.71,Rad+0.1>
>   }
>   texture {
>     pigment {
>       image_map {
>         gif "logo_image.gif"
>         transmit 209, 1.0 // make the background of the image transparent
>         once
>         map_type 0
>         interpolate 2
>       }
>     }
>     // scale the logo to fit
>     translate <-0.5,-0.5,0>
>     scale <224/167,1,1>
>     scale 1.4
>   }
>   // position the logo cylinder on the drinking glass
>   translate <0,3.75,0>
>   rotate y*11
> }
> 
> #declare DrinkingGlass = union {
>   object {GlassMain}
>   object {Logo}
> }
> 
> Eric
> --------------------
> http://www.datasync.com/~ericfree
> --------------------
> "The whole problem with the world is that fools and fanatics are always so
> certain of themselves, but wiser people so full of doubts."
> --Bertrand Russel

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