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complete proper split in z

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This commit is contained in:
Stewart Allen 2022-01-15 16:38:50 -05:00
commit 1958bd0c5f
4 changed files with 67 additions and 10 deletions
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58
src/mesh/work.js
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@ -37,7 +37,8 @@ function cacheUpdate(id, data) {
function translate_encode(id, matrix) {
let rec = cache[id];
let geo = rec.geo.clone();
geo.applyMatrix4(core_matrix.clone().multiply( new Matrix4().fromArray(matrix) ));
let mat = core_matrix.clone().multiply(new Matrix4().fromArray(matrix));
geo.applyMatrix4(mat);
return geo.attributes.position.array;
}
@ -87,16 +88,65 @@ let model = {
let o1 = [];
let o2 = [];
let pos = translate_encode(id, matrix);
let split = [];
let on = [];
let over = [];
let under = [];
function sort(v) {
if (v.z < z) return under.push(v);
if (v.z > z) return over.push(v);
on.push(v);
}
function lerp(v1, v2) {
let zd = Math.abs(v1.z - v2.z);
let z1 = Math.abs(v1.z - z);
return v1.clone().lerp(v2, z1/zd);
}
for (let i=0, l=pos.length; i<l; ) {
let v1 = new Vector3(pos[i++], pos[i++], pos[i++]);
let v2 = new Vector3(pos[i++], pos[i++], pos[i++]);
let v3 = new Vector3(pos[i++], pos[i++], pos[i++]);
if (v1.z < z && v2.z < z && v3.z < z) {
o1.appendAll([...v1, ...v2, ...v3]);
} else {
sort(v1);
sort(v2);
sort(v3);
let onl = on.length;
let overl = over.length;
let underl = under.length;
let isover = (overl === 3 || underl === 0);
let isunder = (underl === 3 || overl === 0);
let split = !(isover || isunder);
if (isover) {
o2.appendAll([...v1, ...v2, ...v3]);
}
if (isunder) {
o1.appendAll([...v1, ...v2, ...v3]);
}
if (split) {
if (overl === 2) {
// two over, one under
let vo = under[0] || on[0]; // under or on
let m1 = lerp(over[0], vo);
let m2 = lerp(over[1], vo);
o2.appendAll([ ...over[0], ...over[1], ...m1 ]);
o2.appendAll([ ...over[1], ...m1, ...m2 ]);
o1.appendAll([ ...m1, ...m2, ...under[0] ]);
} else {
// one over, two under
let vo = over[0] || on[0]; // over or on
let m1 = lerp(under[0], vo);
let m2 = lerp(under[1], vo);
o1.appendAll([ ...under[0], ...under[1], ...m1 ]);
o1.appendAll([ ...under[1], ...m1, ...m2 ]);
o2.appendAll([ ...m1, ...m2, ...over[0] ]);
}
}
on.length = over.length = under.length = 0;
}
let mi4 = core_matrix.clone().multiply(new Matrix4().fromArray(matrix)).invert();
let b1 = new BufferAttribute(o1.toFloat32(), 3);
let b2 = new BufferAttribute(o2.toFloat32(), 3);
o1 = b1.applyMatrix4(mi4).array;
o2 = b2.applyMatrix4(mi4).array;
return { o1, o2 };
},