"Nicolas George" <nicolas$george@salle-s.org> wrote in message 
news:458b8be9$1@news.povray.org...
> Hi.
>
> I often wonder how to make cylinders joining with a miter-join, that is:
>
> ------------+
>           /|
>          / |
>         /  |
> --------+   |
>        |   |
>        |   |
>        |   |
>
> The solution that comes to mind immediately is to use something like:
>
> union {
>  intersection {
>    cylinder { horizontal }
>    plane { diagonal, interior up }
>  }
>  intersection {
>    cylinder { vertical }
>    plane { diagonal, interior down }
>  }
> }
>
> But it leads to coincident surfaces. Making the cylinders overlap is not
> good either, because near the point of the angle, the biggest cylinder is
> the wrong one.
>
> Any suggestion?
>

I may be missing something obvious to everyone else here, but why not just 
use merge instead of union to get rid of the internal coincident surfaces?

camera {location <0,0,-1> look_at 0}
light_source { <-1, 0.3, -2> color rgb 1}
merge {
  difference {
    cylinder {-y,y*0.2,0.2}
    plane {y,0 rotate z*225}
  }
  difference {
    cylinder {-x,x*0.2,0.2}
    plane {y,0 rotate z*45}
  }
  pigment {color rgb <1,0,0>}
  clipped_by {plane {-z,0}}
  rotate y*45
}

or did I missunderstand the questoin?

Regards,
Chris B.

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