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add loop collinear filtering

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This commit is contained in:
Stewart Allen 2021-09-06 19:03:32 -04:00
commit 083d6256f3
1 changed files with 49 additions and 7 deletions
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46
src/geo/mesh.js
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@ -91,6 +91,30 @@
this.faces.push(face);
}
}
unitVector() {
if (this.unit !== undefined) {
return this.unit;
}
let v1 = this.v1;
let v2 = this.v2;
let d = [
vertices[v1] - vertices[v2],
vertices[v1 + 1] - vertices[v2 + 1],
vertices[v1 + 2] - vertices[v2 + 2],
];
let max = Math.max(...d.map(v => Math.abs(v)));
// console.log({d, max});
return this.unit = d.map(v => v / max);
}
}
function diffUnitVector(uv1, uv2) {
let diff = 0;
for (let i=0; i<3; i++) {
diff += Math.abs(uv1[i] - uv2[i]);
}
return diff;
}
function getLine(v1, v2) {
@ -142,7 +166,9 @@
let loop = [ line ];
// build line through adjacent lines
while (true) {
let adjacent = vmap[line.v1].concat(vmap[line.v2]).filter(l => l !== line && !l.used && l.faces.length === 1);
let adjacent = vmap[line.v1]
.concat(vmap[line.v2])
.filter(l => l !== line && !l.used && l.faces.length === 1);
if (adjacent.length === 0) {
break;
}
@ -150,11 +176,20 @@
console.log('error adjacent', adjacent);
break;
}
if (adjacent.length === 1) {
if (line.v2 !== adjacent[0].v1) {
console.log('chirality mismatch');
}
line = adjacent[0];
} else {
// follow edges according to chirality
line = adjacent[0].v1 === line.v2 ?
adjacent[0] :
adjacent[1]
}
loop.push(line);
line.used = true;
}
console.log({loop});
// drop co-linear points because they can't be connected into valid faces
// fixup remaining line by dropping common point and using dropped line's point
for (let j=0, jl=loop.length; j<jl-1; j++) {
@ -168,8 +203,15 @@
continue;
}
// todo
if (diffUnitVector(l1.unitVector(), l2.unitVector()) < 0.0001) {
// console.log('collinear', l1, l2);
l2.del = true;
l1.v2 = l2.v2;
}
}
}
loop = loop.filter(l => !l.del);
console.log({loop});
loops.push(loop);
}