unionRoundMask.scad

addressing issue 844

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/*
unionRound() 1.0 Module by Torleif Ceder - TLC123 late summer 2021
 Pretty fast Union with radius, But limited to a subset of cases
Usage 
 unionRound( radius , detail  )
    {
     YourObject1();
     YourObject2(); 
    } 
  unionRoundMask (r, detail , epsilon ,showMask )
    {
     YourObject1();
     YourObject2(); 
     YourMask();
     YourMask(); // multi-mask not implemented
     
     // ...
     // ...
     // ...
     
    } 
limitations: 
 0. Only really fast when boolean operands are convex, 
        Minkowski is fast in that case. 
 1. Boolean operands may be concave but can only touch 
        in a single convex area
 2. Radius is of elliptic type and is only approximate r
        were operand intersect at perpendicular angle. 
*/
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