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use epsilon value for more accurate zflat calculation

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This commit is contained in:
Stewart Allen 2025-10-29 19:40:52 -04:00
commit 052716ec6d
3 changed files with 10 additions and 10 deletions
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4
src/geo/slicer.js
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@ -12,6 +12,8 @@ import { polygons } from '../geo/polygons.js';
import { newPoint } from '../geo/point.js';
import { config } from '../geo/base.js';
const epsilon = 10e-5;
function dval(v, dv) {
return v !== undefined ? v : dv;
}
@ -75,7 +77,7 @@ export async function slice(points, options = {}) {
// used to calculate buckets (rough sum of z span)
zSum += (Math.abs(p1.z - p2.z) + Math.abs(p2.z - p3.z) + Math.abs(p3.z - p1.z));
// use co-flat and co-line detection to adjust slice Z
if (p1.z === p2.z && p2.z === p3.z && p1.z >= zMin) {
if (Math.abs(p1.z - p2.z) < epsilon && Math.abs(p2.z - p3.z) < epsilon && p1.z >= zMin) {
// detect faces co-planar with Z and sum the enclosed area
let zkey = p1.z,
area = Math.abs(base.util.area2(p1,p2,p3)) / 2;