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repair gaps in the gyroid

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This commit is contained in:
Stewart Allen 2019-01-21 21:00:24 -05:00
commit 75405eb66b
3 changed files with 56 additions and 70 deletions
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56
web/kiri/gyroid-test.html
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@ -97,23 +97,23 @@
// left-right threshold search (red)
vals.forEach((vrow, y) => {
let erow = edge[y];
let lval = vrow[vrow.length - 1];
vrow.forEach((val, x) => {
if ((lval <= 0 && val >= 0) || (lval >= 0 && val <= 0)) {
let v0 = vrow[vrow.length - 1];
vrow.forEach((v1, x) => {
if ((v0 <= 0 && v1 >= 0) || (v0 >= 0 && v1 <= 0)) {
erow[x] = 1;
points++;
points_lr++;
}
lval = val;
v0 = v1;
})
});
// top-down threshold search (green)
for (let x=0; x<rez; x++) {
let lval = vals[vals.length-1][x];
let v0 = vals[vals.length-1][x];
for (let y=0; y<rez; y++) {
let val = vals[y][x];
if (lval <= 0 && val >= 0) {
let v1 = vals[y][x];
if ((v0 <= 0 && v1 >= 0) || (v0 >= 0 && v1 <= 0)) {
if (edge[y][x]) {
edge[y][x] = 3;
} else {
@ -122,7 +122,7 @@
}
points_td++;
}
lval = val;
v0 = v1;
}
}
@ -145,6 +145,9 @@
return b.dist - a.dist;
});
// preserve sparse points for rendering
let raw = sparse.slice();
// join sparse points array by closest distance
let polys = [];
let chain;
@ -195,17 +198,17 @@
// simplify poly
polys = polys.map(poly => filter(poly));
return zcache[zkey] = {edge, points, dir, polys};
return zcache[zkey] = { raw, points, dir, polys };
}
function filter(poly) {
if (poly.length === 1) {
if (poly.length <= 2) {
return poly;
}
let nuchain = [];
let e1 = poly[0];
let nuchain = [ poly[0] ];
let e1 = poly[1];
let e2 = null;
let last = poly.length - 1;
let last = poly.length - 2;
for (let i=1; i<poly.length; i++) {
let el = poly[i];
if (e1.x === el.x || e1.y === el.y) {
@ -225,6 +228,7 @@
}
e1 = el;
}
nuchain.push(poly[poly.length-1]);
return nuchain;
}
@ -238,10 +242,10 @@
}
function render(z) {
let size = 800;
let size = 600;
let wh = size / rez;
let html = [`<svg width=${size} height=${size}>`];
let { edge, points, dir, polys } = generate(z);
let { raw, points, dir, polys } = generate(z);
$('points').value = points;
$('direction').value = dir;
@ -249,14 +253,20 @@
// raw threshold points
html.push('<g>');
polys.forEach(poly => {
poly.forEach(point => {
let x = point.x;
let y = point.y;
let color = ['black','#f00a','#0f0a','#00fa'][point.val];
html.push(`<rect dist="${point.dist}" x="${x*wh}" y="${y*wh}" width="${wh}" height="${wh}" style="fill:${color};stroke-width:0"/>`);
});
});
raw.forEach(point => {
let x = point.x;
let y = point.y;
let color = ['black','#f00a','#0f0a','#00fa'][point.val];
html.push(`<rect dist="${point.dist}" x="${x*wh}" y="${y*wh}" width="${wh}" height="${wh}" style="fill:${color};stroke-width:0"/>`);
})
// polys.forEach(poly => {
// poly.forEach(point => {
// let x = point.x;
// let y = point.y;
// let color = ['black','#f00a','#0f0a','#00fa'][point.val];
// html.push(`<rect dist="${point.dist}" x="${x*wh}" y="${y*wh}" width="${wh}" height="${wh}" style="fill:${color};stroke-width:0"/>`);
// });
// });
html.push('</g>');
// points joined into poly lines