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rewrite gpu flatness detection to use same algorithm as cpu code

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This commit is contained in:
Stewart Allen 2026-01-05 00:14:19 -05:00
commit 7642aaab7b
1 changed files with 29 additions and 13 deletions
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42
src/kiri/mode/cam/topo3.js
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@ -265,24 +265,40 @@ export class Topo {
// drop interior points along a continuous slope
for (let poly of lines) {
let { points } = poly;
if (points.length < 2) continue;
let merged = [ points[0] ];
let lp = points[1];
let dz = points[0].z - lp.z;
for (let i=2; i<points.length; i++) {
let np = points[i];
let ndz = np.z - lp.z;
if (Math.abs(dz - ndz) > flatness) {
// slope changed
merged.push(lp);
dz = ndz;
} else if (curvesOnly && Math.abs(ndz) < flatness) {
let lastP = points[0];
let latent = null;
let lastSlope = undefined;
for (let i=1; i<points.length; i++) {
let newP = points[i];
const dl = (newP.x - lastP.x) || (newP.y - lastP.y);
const dz = newP.z - lastP.z;
const slope = Math.atan2(dz, dl);
if (curvesOnly && Math.abs(dz) < flatness) {
// end current segment with latent if present
if (latent) {
merged.push(latent);
latent = null;
}
// add empty points as path separators
merged.push(undefined);
lastSlope = undefined;
} else if (lastSlope !== undefined && Math.abs(lastSlope - slope) < flatness) {
latent = newP;
} else {
if (latent) {
merged.push(latent);
latent = null;
}
merged.push(newP);
lastSlope = slope;
}
lp = np;
lastP = newP;
}
if (merged.peek() !== lp) {
merged.push(lp);
// add final latent point if present
if (latent && merged.peek() !== latent) {
merged.push(latent);
}
poly.points = merged;
}