Mike Williams <nos### [at] econymdemoncouk> wrote:
> Wasn't it nevered who wrote:
> >here's what i'm trying to do:
> >
> > blob {
> >  threshold .5
> >  difference{
> >                sphere {
> >                        <0, 0, 0>, 1, 1
> >                        scale <12, 10, 1>
> >                        translate<0,0,.5>
> >                }
> >                cylinder {
> >                        <9,0,-20>, <9,0,20>, 10, 1
> >                        scale <1.7,.8,0>
> >                }
> >        }
> >  cone{
> >       <-2,0,.7>, .6, <5,0,-1.3>, .5, 1
> >       scale<0,5,.8>
> >  texture{pigment{color Yellow}}
> > }
>
> Blob doesn't accept the keywords "difference" or "cone".
>
> You can achieve the effect of "difference" by using negative blob
> strengths, but you can't blob a cone.
>
> union {
>  blob {
>   threshold .5
>                 sphere {
>                         <0, 0, 0>, 1, 1
>                         scale <12, 10, 1>
>                         translate<0,0,.5>
>                 }
>                 cylinder {
>                         <9,0,-20>, <9,0,20>, 10, -6
>                         scale <1.7,.8,0>
>                 }
>         }
>   cone{
>        <-2,0,.7>, .6, <5,0,-1.3>, .5
>        scale<0,5,.8> }
>   texture{pigment{color Yellow}}
>  }
> --
> Mike Williams
> Gentleman of Leisure

Thanks!

I had no idea you could use negative strengths.

I'll see what i can do about using a cylinder in place of the cone, since
the difference between the ends is only .1 anyway, and it has to blob to
another flattened sphere at the other end anyway

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