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handle split on middle

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This commit is contained in:
Stewart Allen 2022-01-23 14:45:11 -05:00
commit a006096121
1 changed files with 21 additions and 3 deletions
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24
src/mesh/work.js
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@ -127,8 +127,8 @@ let model = {
// return two arrays of vertices for each resulting object
split(data) {
let { id, matrix, z } = data;
let o1 = [];
let o2 = [];
let o1 = []; // new bottom
let o2 = []; // new top
let pos = translate_encode(id, matrix);
let split = [];
let on = [];
@ -170,11 +170,29 @@ let model = {
g2 = o1;
oa = over;
ua = under;
} else {
} else if (underl === 2) {
g1 = o1;
g2 = o2;
oa = under;
ua = over;
} else if (onl === 1) {
let p1 = over[0];
let p2 = on[0];
let p3 = under[0];
let p4 = lerp(p1, p3);
let cw = (v1 === p1 && v2 === p2)
|| (v1 === p2 && v2 === p3)
|| (v1 === p3 && v2 === p1);
// clockwise vs counter-clockwise
if (cw) {
o1.appendAll([ ...p2, ...p3, ...p4 ]);
o2.appendAll([ ...p1, ...p2, ...p4 ]);
} else {
o1.appendAll([ ...p3, ...p2, ...p4 ]);
o2.appendAll([ ...p2, ...p1, ...p4 ]);
}
on.length = over.length = under.length = 0;
continue;
}
let [ p1, p2 ] = oa;
let p3 = ua[0] || on[0]; // under or on