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improve gyroid generation with continuous lines

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This commit is contained in:
Stewart Allen 2021-06-10 23:07:04 -04:00
commit 33db062eba
1 changed files with 78 additions and 8 deletions
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86
src/mode/fdm/fill.js
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@ -110,18 +110,88 @@
let tile_z = 1 / tile;
let gyroid = BASE.gyroid.slice(target.zValue() * tile_z, (1 - density) * 500);
gyroid.polys.forEach(poly => {
for (let tx=0; tx<=tile_x; tx++) {
for (let ty=0; ty<=tile_y; ty++) {
// gyroid.polys.forEach(poly => {
// for (let tx=0; tx<=tile_x; tx++) {
// for (let ty=0; ty<=tile_y; ty++) {
// target.newline();
// let bx = tx * tile + bounds.min.x;
// let by = ty * tile + bounds.min.y;
// poly.forEach(point => {
// target.emit(bx + point.x * tile, by + point.y * tile);
// });
// }
// }
// });
let polys = [];
for (let tx=0; tx<=tile_x; tx++) {
for (let ty=0; ty<=tile_y; ty++) {
for (let poly of gyroid.polys) {
target.newline();
let bx = tx * tile + bounds.min.x;
let by = ty * tile + bounds.min.y;
poly.forEach(point => {
target.emit(bx + point.x * tile, by + point.y * tile);
let points = poly.map(el => {
return {
x: el.x * tile + tx * tile + bounds.min.x,
y: el.y * tile + ty * tile + bounds.min.y,
z: 0
}
});
polys.push(BASE.newPolygon().setOpen(true).addObj(points));
}
}
});
}
polys = connectOpenPolys(polys.filter(p => p.perimeter() > 2));
for (let poly of polys) {
target.newline();
for (let point of poly.points) {
target.emit(point.x, point.y);
}
}
}
function connectOpenPolys(noff, dist = 0.1) {
if (noff.length <= 1) {
return noff;
}
let heal = 0;
// heal/rejoin open segments that have close endpoints
outer: for(;; heal++) {
let ntmp = noff, tlen = ntmp.length;
for (let i=0; i<tlen; i++) {
let s1 = ntmp[i];
if (!s1 || !s1.open) continue;
for (let j=i+1; j<tlen; j++) {
let s2 = ntmp[j];
if (!s2 || !s2.open) continue;
if (s1.last().distTo2D(s2.first()) <= dist) {
s1.addPoints(s2.points);
ntmp[j] = null;
continue outer;
}
if (s1.first().distTo2D(s2.last()) <= dist) {
s2.addPoints(s1.points);
ntmp[i] = null;
continue outer;
}
if (s1.first().distTo2D(s2.first()) <= dist) {
s1.reverse();
s1.addPoints(s2.points);
ntmp[j] = null;
continue outer;
}
if (s1.last().distTo2D(s2.last()) <= dist) {
s1.addPoints(s2.points.reverse());
ntmp[j] = null;
continue outer;
}
}
}
break;
}
if (heal > 0) {
// cull nulls
noff = noff.filter(o => o);
}
return noff;
}
function fillGrid(target) {