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?

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