I head the idea to construct a screw and the opposite part; a nut ? (Sorry,

For this I had the idea to contruct a flat polygon (6 corners), cut off a
circle inside, sweep it to the third dimension and then use CSG to do the
remaining.
But how to cut off the circle inside the polygon ?
So, the first step is to define the polygon.

# declare Radius_Aussen = 0.5;
# declare Radius_Innen  = 0.3;
# declare Anfangswinkel = 0.0;
# declare Mittelpunkt   = <0.0, 0.0, 0.0>;
# declare Winkel = Anfangswinkel;
# declare Increment = pi/3.0;
# declare X_Koordinate  = 0.0;
# declare Y_Koordinate  = 0.0;
# declare Eckpunkt      = array [6];
# declare Index         = 0;


# while (Index < 6)
  # X_Koordinate = Mittelpunkt.x + Radius_Aussen * Winkel; // This does not
work
  # Y_Koordinate = Mittelpunkt.y + Radius_Aussen * Winkel; // This does not
work
  # Eckpunkt [Index] = <X_Koordinate, Y_Koordinate>;
  # Index = Index + 1;
  # Winkel = Anfangswinkel + Index * Increment;
# end
# declare Grundflaeche =
polygon
{
  6, Eckpunkt[0], Eckpunkt[1], Eckpunkt[2],
     Eckpunkt[3], Eckpunkt[4], Eckpunkt[5]
}

Thank you

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