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skip chains and use medial axis segments directly

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This commit is contained in:
Stewart Allen 2025-09-18 18:28:53 -04:00
commit ddf3972f35
1 changed files with 25 additions and 15 deletions
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40
src/kiri/mode/fdm/post.js
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@ -186,7 +186,7 @@ function thin_type_3(params) {
let showChainRawPoints = false;
let showChainInterpPoints = true;
let showChainIntersect = false;
let showNuMedLine = false;
let showNuMedLine = true;
let showMedPoints = false;
let showMedNormals = false;
let showMedRadii = false;
@ -627,6 +627,7 @@ function thin_type_3(params) {
// gather point offsets into shells
let zi = z;
let nuchains = [];
let nusegs = [];
for (let chain of chains) {
let nuchain = [];
nuchains.push(nuchain);
@ -727,6 +728,7 @@ function thin_type_3(params) {
for (let i=0; i<nuchain.length-1; i++) {
let p0 = nuchain[i];
let p1 = nuchain[i+1];
nusegs.push({ p0, p1 });
thin.push(new Point(p0.x, p0.y, z));
thin.push(new Point(p1.x, p1.y, z));
}
@ -748,20 +750,27 @@ function thin_type_3(params) {
let len = pointDist(p1, p2);
let dx = (p1.x - p2.x) / len;
let dy = (p1.y - p2.y) / len;
let np2 = { x: np1.x + dy * 10, y: np1.y - dx * 10 };
let min = { dist: Infinity };
for (let chain of nuchains) {
for (let i=0; i<chain.length-1; i++) {
let c1 = chain[i];
let c2 = chain[i+1];
let int = intersectRayLine(np1, { dx: dy, dy: -dx }, c1, c2);
if (int?.dist < min.dist && int?.dist < offsetN * count) {
min = int;
}
// for (let chain of nuchains) {
// for (let i=0; i<chain.length-1; i++) {
// let c1 = chain[i];
// let c2 = chain[i+1];
// let int = intersectRayLine(np1, { dx: dy, dy: -dx }, c1, c2);
// if (int?.dist < min.dist && int?.dist < offsetN * count) {
// min = int;
// }
// }
// }
for (let seg of nusegs) {
let { p0, p1 } = seg;
let int = intersectRayLine(np1, { dx: dy, dy: -dx }, p0, p1);
if (int?.dist < min.dist && int?.dist < offsetN * count) {
min = int;
min.seg = seg;
}
}
if (min.p1) {
let { p1, p2 } = min;
let mp1 = min.seg;
if (showChainIntersect) {
thin.push(new Point(np1.x, np1.y));
thin.push(new Point(min.x, min.y));
@ -774,10 +783,9 @@ function thin_type_3(params) {
let pop = div(mr);
let odd = (pop.length % 2 === 1);
let len = Math.ceil(pop.length / 2);
if (odd && p1.claimed) len--;
// implement first-to-intersect claim system
// check if chain segment was claimed by a different originating segment
// for odd wall counts so that they're not emitted twice
// todo extend to all odd counts
if (odd && mp1.claimed) len--;
if (len === 0) {
nupoly.push(new Point(min.x, min.y));
return;
@ -804,7 +812,9 @@ function thin_type_3(params) {
off += dstep / 2;
nupoly.push(new Point(np1.x + dy * off * 2, np1.y - dx * off * 2));
}
p1.claimed = true;
if (odd && !mp1.claimed) {
mp1.claimed = true;
}
}
});
if (showExtrudeInset) {