bracelet_1.md

OpenSCAD sample from http://forum.openscad.org/OpenSCAD-performance-numbers-td4707.html

num=20;
for (i=[0:num-1])
  rotate([0,0,i*360/num])
    translate([40,0,0])
      rotate([0,i*90,0])
        scale([0.7,1,1])
          rotate_extrude() translate([10,0,0]) circle(r=2);

OpenSCAD 2019.03.31
https://www.openscad.org/

Copyright (C) 2009-2019 The OpenSCAD Developers

This program is free software; you can redistribute it and/or modify 
it under the terms of the GNU General Public License as published by 
the Free Software Foundation; either version 2 of the License, 
or (at your option) any later version.

Loaded design '/home/ca/STL/bracelet.scad'.
Compiling design (CSG Tree generation)...
Compiling design (CSG Products generation)...
Geometries in cache: 3
Geometry cache size in bytes: 30776
CGAL Polyhedrons in cache: 0
CGAL cache size in bytes: 0
Compiling design (CSG Products normalization)...
Normalized CSG tree has 20 elements
Compile and preview finished.
Total rendering time: 0 hours, 0 minutes, 0 seconds

Parsing design (AST generation)...
Compiling design (CSG Tree generation)...
Rendering Polygon Mesh using CGAL...
Geometries in cache: 32
Geometry cache size in bytes: 912144
CGAL Polyhedrons in cache: 1
CGAL cache size in bytes: 10311392
Total rendering time: 0 hours, 0 minutes, 15 seconds
Top level object is a 3D object:
Simple: yes
Vertices: 4200
Halfedges: 24032
Edges: 12016
Halffacets: 15632
Facets: 7816
Volumes: 21
Rendering finished.

$ polyfix bracelet.stl 

Parameters:
  input_file = bracelet.stl


polyhedron 0 ================= volume=9558.08, dtol=0.01, atol=1e-06, maxiter=10
iteration 0: vertices=25200 faces=8400
             warning: nonmanifold edges: uc(1)=25200 
             merged 21000 vertices
             total changes=21000
             no warnings

iteration 1: vertices=4200 faces=8400
             total changes=0
             no warnings

Summary: 
             polyhedron 0: vertices=4200 faces=8400 : no warnings

Writing: bracelet_1.stl

... polyfix finished, time used: 0d 00h 00m 00s

bracelet_1.stl

bracelet_2.md

AngelCAD version

shape@ main_shape()
{
   solid@ obj = null;
   uint num = 20;
   for(uint i=0;i<num;i++) {
      solid@ part = rotate_z(deg:i*360.0/num)
                    *translate(40,0,0)
                    *rotate_y(deg:i*90)
                    *scale(0.7,1,1)
                    *rotate_x(deg:90)  // To duplicate OpenSCAD definition
                    *rotate_extrude(translate(10,0,0)*circle(r:2),deg:360);
      if(@obj == null) @obj = part;
      else             @obj = obj + part;
                    
   }
   return obj;
}

void main()
{
   shape@ obj = main_shape();
   obj.write_xcsg(GetInputFullPath(),secant_tolerance:0.14);
}

as_csg started.

Created XCSG file: xcsg/bracelet.xcsg
as_csg v1.3-01 finished, time used: 0d 00h 00m 00.010s

23347 > "/home/ca/cpde_usr/bin/xcsg" --dxf --stl --svg --fullpath "/home/ca/STL/xcsg/bracelet.xcsg"
xcsg processing: /home/ca/STL/xcsg/bracelet.xcsg
processing solid: union3d
...completed CSG tree: 19 boolean operations to process.
...starting boolean operations
...boolean progress: 5.2% 
...boolean progress: 10.5% 
...boolean progress: 15.7% 
...boolean progress: 21% 
...boolean progress: 26.3% 
...boolean progress: 31.5% 
...boolean progress: 36.8% 
...boolean progress: 42.1% 
...boolean progress: 47.3% 
...boolean progress: 52.6% 
...boolean progress: 57.8% 
...boolean progress: 63.1% 
...boolean progress: 68.4% 
...boolean progress: 73.6% 
...boolean progress: 78.9% 
...boolean progress: 84.2% 
...boolean progress: 89.4% 
...boolean progress: 94.7% 
...boolean progress: 100% 
...completed boolean operations in 1.337 [sec] 
...result model contains 20 lumps.
...lump 1: 210 vertices, 170 polygon faces.
...Polyhedron is water-tight (edge use-count check OK)
...Polyhedron has no degenerated faces (face area check OK)
...Polyhedron has 170 non-triangular faces
...Triangulating lump ... 
...Triangulation completed with 420 triangle faces in 0.008 [sec]
...lump 2: 210 vertices, 170 polygon faces.
...Polyhedron is water-tight (edge use-count check OK)
...Polyhedron has no degenerated faces (face area check OK)
...Polyhedron has 170 non-triangular faces
...Triangulating lump ... 
...Triangulation completed with 420 triangle faces in 0.016 [sec]
...lump 3: 210 vertices, 170 polygon faces.
...Polyhedron is water-tight (edge use-count check OK)
...Polyhedron has no degenerated faces (face area check OK)
...Polyhedron has 170 non-triangular faces
...Triangulating lump ... 
...Triangulation completed with 420 triangle faces in 0.025 [sec]
...lump 4: 210 vertices, 170 polygon faces.
...Polyhedron is water-tight (edge use-count check OK)
...Polyhedron has no degenerated faces (face area check OK)
...Polyhedron has 170 non-triangular faces
...Triangulating lump ... 
...Triangulation completed with 420 triangle faces in 0.033 [sec]
...lump 5: 210 vertices, 170 polygon faces.
...Polyhedron is water-tight (edge use-count check OK)
...Polyhedron has no degenerated faces (face area check OK)
...Polyhedron has 170 non-triangular faces
...Triangulating lump ... 
...Triangulation completed with 420 triangle faces in 0.041 [sec]
...lump 6: 210 vertices, 170 polygon faces.
...Polyhedron is water-tight (edge use-count check OK)
...Polyhedron has no degenerated faces (face area check OK)
...Polyhedron has 170 non-triangular faces
...Triangulating lump ... 
...Triangulation completed with 420 triangle faces in 0.05 [sec]
...lump 7: 210 vertices, 170 polygon faces.
...Polyhedron is water-tight (edge use-count check OK)
...Polyhedron has no degenerated faces (face area check OK)
...Polyhedron has 170 non-triangular faces
...Triangulating lump ... 
...Triangulation completed with 420 triangle faces in 0.058 [sec]
...lump 8: 210 vertices, 170 polygon faces.
...Polyhedron is water-tight (edge use-count check OK)
...Polyhedron has no degenerated faces (face area check OK)
...Polyhedron has 170 non-triangular faces
...Triangulating lump ... 
...Triangulation completed with 420 triangle faces in 0.067 [sec]
...lump 9: 210 vertices, 170 polygon faces.
...Polyhedron is water-tight (edge use-count check OK)
...Polyhedron has no degenerated faces (face area check OK)
...Polyhedron has 170 non-triangular faces
...Triangulating lump ... 
...Triangulation completed with 420 triangle faces in 0.075 [sec]
...lump 10: 210 vertices, 170 polygon faces.
...Polyhedron is water-tight (edge use-count check OK)
...Polyhedron has no degenerated faces (face area check OK)
...Polyhedron has 170 non-triangular faces
...Triangulating lump ... 
...Triangulation completed with 420 triangle faces in 0.084 [sec]
...lump 11: 210 vertices, 170 polygon faces.
...Polyhedron is water-tight (edge use-count check OK)
...Polyhedron has no degenerated faces (face area check OK)
...Polyhedron has 170 non-triangular faces
...Triangulating lump ... 
...Triangulation completed with 420 triangle faces in 0.092 [sec]
...lump 12: 210 vertices, 170 polygon faces.
...Polyhedron is water-tight (edge use-count check OK)
...Polyhedron has no degenerated faces (face area check OK)
...Polyhedron has 170 non-triangular faces
...Triangulating lump ... 
...Triangulation completed with 420 triangle faces in 0.1 [sec]
...lump 13: 210 vertices, 170 polygon faces.
...Polyhedron is water-tight (edge use-count check OK)
...Polyhedron has no degenerated faces (face area check OK)
...Polyhedron has 170 non-triangular faces
...Triangulating lump ... 
...Triangulation completed with 420 triangle faces in 0.108 [sec]
...lump 14: 210 vertices, 170 polygon faces.
...Polyhedron is water-tight (edge use-count check OK)
...Polyhedron has no degenerated faces (face area check OK)
...Polyhedron has 170 non-triangular faces
...Triangulating lump ... 
...Triangulation completed with 420 triangle faces in 0.117 [sec]
...lump 15: 210 vertices, 170 polygon faces.
...Polyhedron is water-tight (edge use-count check OK)
...Polyhedron has no degenerated faces (face area check OK)
...Polyhedron has 170 non-triangular faces
...Triangulating lump ... 
...Triangulation completed with 420 triangle faces in 0.125 [sec]
...lump 16: 210 vertices, 170 polygon faces.
...Polyhedron is water-tight (edge use-count check OK)
...Polyhedron has no degenerated faces (face area check OK)
...Polyhedron has 170 non-triangular faces
...Triangulating lump ... 
...Triangulation completed with 420 triangle faces in 0.133 [sec]
...lump 17: 210 vertices, 170 polygon faces.
...Polyhedron is water-tight (edge use-count check OK)
...Polyhedron has no degenerated faces (face area check OK)
...Polyhedron has 170 non-triangular faces
...Triangulating lump ... 
...Triangulation completed with 420 triangle faces in 0.141 [sec]
...lump 18: 210 vertices, 170 polygon faces.
...Polyhedron is water-tight (edge use-count check OK)
...Polyhedron has no degenerated faces (face area check OK)
...Polyhedron has 170 non-triangular faces
...Triangulating lump ... 
...Triangulation completed with 420 triangle faces in 0.15 [sec]
...lump 19: 210 vertices, 170 polygon faces.
...Polyhedron is water-tight (edge use-count check OK)
...Polyhedron has no degenerated faces (face area check OK)
...Polyhedron has 170 non-triangular faces
...Triangulating lump ... 
...Triangulation completed with 420 triangle faces in 0.158 [sec]
...lump 20: 210 vertices, 170 polygon faces.
...Polyhedron is water-tight (edge use-count check OK)
...Polyhedron has no degenerated faces (face area check OK)
...Polyhedron has 170 non-triangular faces
...Triangulating lump ... 
...Triangulation completed with 420 triangle faces in 0.166 [sec]
...Exporting results 
Created STL file     : /home/ca/STL/xcsg/bracelet.stl
xcsg finished using 0h 0m 1.51s

$ polyfix bracelet.stl 

Parameters:
  input_file = bracelet.stl


polyhedron 0 ================= volume=10187.2, dtol=0.01, atol=1e-06, maxiter=10
iteration 0: vertices=25200 faces=8400
             warning: nonmanifold edges: uc(1)=25200 
             merged 21000 vertices
             total changes=21000
             no warnings

iteration 1: vertices=4200 faces=8400
             total changes=0
             no warnings

Summary: 
             polyhedron 0: vertices=4200 faces=8400 : no warnings

Writing: bracelet_1.stl

... polyfix finished, time used: 0d 00h 00m 00s

bracelet_2.stl