Parameters
- C1
- First curve
- C2
- Second curve
- radius
- Radius of the fillet arc
- flip1
- Flips first curve direction
- flip2
- Flips second curve direction
- trim1
- When true the first curve is trimmed
- trim2
- When true the second curve is trimmed
- fillet
- The resulting fillet arc
Return Value
True if the operation is successful, false if the curves don't lie on the same plane or don't touch.