Hello, all.

Doing a lot of CSG work has prompted this request.  Whenever I require an
'open' cylinder that has some thickness to it's 'walls', I need to do a CSG
construct, e.g.:

difference {
    cylinder {y*-1 y*1 1}
    cylinder {y*-2 y*2 0.5}
    texture {i_can't_believe_its_not_butter}
}

Would it be possible to create a command that's a cross between cylinder and
disc so that I can specify an inner radius for an 'open' cylinder without
going CSG?

Many thanks,
Alan.

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Alan <man### [at] freeukcom> wrote:
: Would it be possible to create a command that's a cross between cylinder and
: disc so that I can specify an inner radius for an 'open' cylinder without
: going CSG?

  You can easily make a #macro for this.

-- 
main(i,_){for(_?--i,main(i+2,"FhhQHFIJD|FQTITFN]zRFHhhTBFHhhTBFysdB"[i]
):_;i&&_>1;printf("%s",_-70?_&1?"[]":" ":(_=0,"\n")),_/=2);} /*- Warp -*/

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Warp wrote:
> 
> Alan <man### [at] freeukcom> wrote:
> : Would it be possible to create a command that's a cross between
> : cylinder and disc so that I can specify an inner radius for an
> : 'open' cylinder without going CSG?

> You can easily make a #macro for this.

#macro Macaroni(Start,End,OuterRad,InnerRad)
  #local vA=vnormalize(End-Start);
  difference {
    cylinder { Start,End,OuterRad }
    cylinder { Start-vA,End+vA,InnerRad }
  }
#end

Regards,
John

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Thanks for the macro, John!  Just me being lazy, really.

Alan.

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