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jscad / csg.js

DEPRECATED: CSG Library for JSCAD (See the link below)
https://github.com/jscad/OpenJSCAD.org/tree/master/packages/modeling
MIT License
217 stars 56 forks source link

Difference result is not ideal #195

Closed FishOrBear closed 2 years ago

FishOrBear commented 4 years ago

ver:v0.7 or v2

image

test code:


let g1= geom3.fromPoints(
  [[[256.8389840042205,977.0948774556746,0],[1156.9999413406463,1740.4903394918074,0],[2189.5569405471892,1749.4525587300886,0]],[[1540.204584590158,258.0981275777449,0],[0.00005578156424235203,-0.000016953505109995604,0],[256.8389840042205,977.0948774556746,0]],[[2189.5569405471892,1749.4525587300886,0],[2353.1832833206267,1531.57102796837,0],[1540.204584590158,258.0981275777449,0]],[[1540.204584590158,258.0981275777449,0],[256.8389840042205,977.0948774556746,0],[2189.5569405471892,1749.4525587300886,0]],[[2189.5569405471892,1749.4525587300886,18],[1156.9999413406463,1740.4903394918074,18],[256.8389840042205,977.0948774556746,18]],[[256.8389840042205,977.0948774556746,18],[0.00005578156424235203,-0.000016953505109995604,18],[1540.204584590158,258.0981275777449,18]],[[1540.204584590158,258.0981275777449,18],[2353.1832833206267,1531.57102796837,18],[2189.5569405471892,1749.4525587300886,18]],[[2189.5569405471892,1749.4525587300886,18],[256.8389840042205,977.0948774556746,18],[1540.204584590158,258.0981275777449,18]],[[256.8389840042205,977.0948774556746,0],[0.00005578156424235203,-0.000016953505109995604,0],[256.8389840042205,977.0948774556746,18]],[[0.00005578156424235203,-0.000016953505109995604,0],[0.00005578156424235203,-0.000016953505109995604,18],[256.8389840042205,977.0948774556746,18]],[[0.00005578156424235203,-0.000016953505109995604,0],[1540.204584590158,258.0981275777449,0],[0.00005578156424235203,-0.000016953505109995604,18]],[[1540.204584590158,258.0981275777449,0],[1540.204584590158,258.0981275777449,18],[0.00005578156424235203,-0.000016953505109995604,18]],[[1540.204584590158,258.0981275777449,0],[2353.1832833206267,1531.57102796837,0],[1540.204584590158,258.0981275777449,18]],[[2353.1832833206267,1531.57102796837,0],[2353.1832833206267,1531.57102796837,18],[1540.204584590158,258.0981275777449,18]],[[2353.1832833206267,1531.57102796837,0],[2189.5569405471892,1749.4525587300886,0],[2353.1832833206267,1531.57102796837,18]],[[2189.5569405471892,1749.4525587300886,0],[2189.5569405471892,1749.4525587300886,18],[2353.1832833206267,1531.57102796837,18]],[[2189.5569405471892,1749.4525587300886,0],[1156.9999413406463,1740.4903394918074,0],[2189.5569405471892,1749.4525587300886,18]],[[1156.9999413406463,1740.4903394918074,0],[1156.9999413406463,1740.4903394918074,18],[2189.5569405471892,1749.4525587300886,18]],[[1156.9999413406463,1740.4903394918074,0],[256.8389840042205,977.0948774556746,0],[1156.9999413406463,1740.4903394918074,18]],[[256.8389840042205,977.0948774556746,0],[256.8389840042205,977.0948774556746,18],[1156.9999413406463,1740.4903394918074,18]]]
)

let g2 = geom3.fromPoints(
  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)
console.log(g2);

let ggg= subtract(g1,g2);
z3dev commented 4 years ago

@FishOrBear thanks again.

OK. I did some research on this issue. Here's what I found out.

If you scale() those shapes then the subtract works fine.

  g1 = transforms.scale([0.01, 0.01, 0.01], g1)
  g2 = transforms.scale([0.01, 0.01, 0.01], g2)

This is reenforcing my understanding of the logic inside the boolean routines. Basically, the booleans are optimized for units of 1. The LARGE size of your shapes are pushing the precision of the math being performed, and cause polygons to ignored or removed.

z3dev commented 4 years ago

I can reproduce this issue with two simple primitives, with large scale.

  let shape1 = primitives.cylinder({segments: 14, height: 18, startRadius: 2123.456789, endRadius: 2123.456789})
  let shape2 = primitives.cylinder({segments: 7, height: 18, startRadius: 512.3456789, endRadius: 512.3456789})
  let shape3 = booleans.subtract(shape1, shape2)

I'd like to keep this issue as a BUG. Is that fine?

FishOrBear commented 4 years ago

OK, thank you.

` Basically, the booleans are optimized for units of 1. ` This gave me some inspiration, would it be better to write this in the document? (Before not solving the problem)

z3dev commented 2 years ago

This will not be fixed. Please reopen issues at OpenJSCAD.org