unionRound module

OpenSCAD
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unionRound Module by Torleif Ceder - TLC123 late summer 2021
 Pretty fast Union with radius, But limited to subset of cases
Usage 

 unionRound( radius , detail , epsilon= 0.00001)
  {
      YourObject1 ();
      YourObject2 (); 
      YourIsolatingMASKObject (); 
  } 

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.
3. For chamfer detail can be set to 1 with approximate double the radius

  module unionRound( 
  radius=1,                        // fillet radius
  detail=5,                         //  fillet detail
  epsilon = 0.00001,         // some numeric  CGAL issues resolve with different value
  showIsolators = false,     // visualize isolation masks in red
  forceFaster=true,             // force all operands to be convex before minkowski
  microTranslateSeed=.1   // some numeric  CGAL issues resolve with micro-translations
  )

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