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improve slice/preview visuals with custom normals

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This commit is contained in:
Stewart Allen 2022-10-14 12:42:51 -04:00
commit ce856146e9
7 changed files with 143 additions and 41 deletions
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92
src/geo/paths.js
View file

@ -196,6 +196,8 @@ function pointsToPath(points, offset, open, miter = 1.5) {
const left = [];
const right = [];
const faces = [];
const normals = [];
const zn = -1;
// calculate vertex normals from segments normals
// vertex info is associated with the origin point
let fl, fr;
@ -244,19 +246,33 @@ function pointsToPath(points, offset, open, miter = 1.5) {
let r1 = right.peek(1);
let l2 = left.peek(2);
let r2 = right.peek(2);
let ln = l1.vp.normal;
let rn = r1.vp.normal;
if (split_left && split_right) {
faces.push(l1, l2, r1);
faces.push(r2, r1, l2);
fl = fl || l2;
fr = fr || r2;
normals.push(ln.dx, ln.dy, zn);
normals.push(ln.dx, ln.dy, zn);
normals.push(-rn.dx, -rn.dy, zn);
normals.push(-rn.dx, -rn.dy, zn);
normals.push(-rn.dx, -rn.dy, zn);
normals.push(ln.dx, ln.dy, zn);
} else if (split_left) {
faces.push(l1, l2, r1);
fl = fl || l2;
fr = fr || r1;
normals.push(ln.dx, ln.dy, zn);
normals.push(ln.dx, ln.dy, zn);
normals.push(-rn.dx, -rn.dy, zn);
} else { // split right
faces.push(r2, r1, l1);
fl = fl || l1;
fr = fr || r2;
normals.push(-rn.dx, -rn.dy, zn);
normals.push(-rn.dx, -rn.dy, zn);
normals.push(ln.dx, ln.dy, zn);
}
}
} else {
@ -270,6 +286,14 @@ function pointsToPath(points, offset, open, miter = 1.5) {
let r1 = right.peek(split_right ? 2 : 1);
faces.push(l1, l0, r1);
faces.push(r0, r1, l0);
let ln = l0.vp.normal;
let rn = r0.vp.normal;
normals.push(ln.dx, ln.dy, zn);
normals.push(ln.dx, ln.dy, zn);
normals.push(-rn.dx, -rn.dy, zn);
normals.push(-rn.dx, -rn.dy, zn);
normals.push(-rn.dx, -rn.dy, zn);
normals.push(ln.dx, ln.dy, zn);
}
}
if (open) {
@ -292,15 +316,24 @@ function pointsToPath(points, offset, open, miter = 1.5) {
if (!open && faces) {
let l1 = left.peek(1);
let r1 = right.peek(1);
let ln = l1.vp.normal;
let rn = r1.vp.normal;
faces.push(fl, l1, fr);
faces.push(r1, fr, l1);
normals.push(ln.dx, ln.dy, zn);
normals.push(ln.dx, ln.dy, zn);
normals.push(-rn.dx, -rn.dy, zn);
normals.push(-rn.dx, -rn.dy, zn);
normals.push(-rn.dx, -rn.dy, zn);
normals.push(ln.dx, ln.dy, zn);
}
return { left, right, faces, open };
return { left, right, faces, normals, open };
}
function pathTo3D(path, height, z) {
const { faces, left, right, open } = path;
const { faces, normals, left, right, open } = path;
const out = [];
const nrm = [];
if (!(faces && left && right)) {
return [];
}
@ -315,6 +348,13 @@ function pathTo3D(path, height, z) {
for (let p of faces.slice().reverse()) {
out.push(p.x, p.y, p.z + height);
}
nrm.appendAll(normals);
// reverse normals to match faces, but underside so reverse Z as well
for (let i=normals.length-1; i>0; i-=3) {
nrm.push(normals[i-2]);
nrm.push(normals[i-1]);
nrm.push(-normals[i-0]);
}
for (let i=0, l=left.length, tl = open ? l-1 : l; i<tl; i++) {
let p0 = left[i];
let p1 = left[(i+1)%l];
@ -324,6 +364,13 @@ function pathTo3D(path, height, z) {
out.push(p1.x, p1.y, p1.z - height);
out.push(p1.x, p1.y, p1.z + height);
out.push(p0.x, p0.y, p0.z + height);
let ln = p0.vp.normal;
nrm.push(ln.dx, ln.dy, -1);
nrm.push(ln.dx, ln.dy, 1);
nrm.push(ln.dx, ln.dy, 1);
nrm.push(ln.dx, ln.dy, 1);
nrm.push(ln.dx, ln.dy, -1);
nrm.push(ln.dx, ln.dy, -1);
}
for (let i=0, l=right.length, tl = open ? l-1 : l; i<tl; i++) {
let p0 = right[i];
@ -334,8 +381,16 @@ function pathTo3D(path, height, z) {
out.push(p1.x, p1.y, p1.z - height);
out.push(p0.x, p0.y, p0.z + height);
out.push(p1.x, p1.y, p1.z + height);
let rn = p0.vp.normal;
nrm.push(-rn.dy, rn.dx, 1);
nrm.push(-rn.dy, rn.dx, -1);
nrm.push(-rn.dy, rn.dx, -1);
nrm.push(-rn.dy, rn.dx, -1);
nrm.push(-rn.dy, rn.dx, 1);
nrm.push(-rn.dy, rn.dx, 1);
}
if (open) {
// begin cap
let l0 = left[0];
let r0 = right[0];
out.push(l0.x, l0.y, l0.z + height);
@ -344,16 +399,31 @@ function pathTo3D(path, height, z) {
out.push(r0.x, r0.y, r0.z + height);
out.push(r0.x, r0.y, r0.z - height);
out.push(l0.x, l0.y, l0.z + height);
let ln = left.peek();
let rn = right.peek();
out.push(ln.x, ln.y, ln.z + height);
out.push(ln.x, ln.y, ln.z - height);
out.push(rn.x, rn.y, rn.z - height);
out.push(rn.x, rn.y, rn.z + height);
out.push(ln.x, ln.y, ln.z + height);
out.push(rn.x, rn.y, rn.z - height);
let ln = l0.vp.normal;
nrm.push(-ln.dy, ln.dx, 1);
nrm.push(-ln.dy, ln.dx, -1);
nrm.push(-ln.dy, ln.dx, -1);
nrm.push(-ln.dy, ln.dx, 1);
nrm.push(-ln.dy, ln.dx, -1);
nrm.push(-ln.dy, ln.dx, 1);
// end cap
let le = left.peek();
let re = right.peek();
out.push(le.x, le.y, le.z + height);
out.push(le.x, le.y, le.z - height);
out.push(re.x, re.y, re.z - height);
out.push(re.x, re.y, re.z + height);
out.push(le.x, le.y, le.z + height);
out.push(re.x, re.y, re.z - height);
ln = re.vp.normal;
nrm.push(-ln.dy, ln.dx, 1);
nrm.push(-ln.dy, ln.dx, -1);
nrm.push(-ln.dy, ln.dx, -1);
nrm.push(-ln.dy, ln.dx, 1);
nrm.push(-ln.dy, ln.dx, 1);
nrm.push(-ln.dy, ln.dx, -1);
}
return out;
return { faces: out, normals: nrm };
}
// produces indexed geometry which isn't ideal for rendering because

5
src/geo/polygon.js
View file

@ -920,6 +920,11 @@ class Polygon {
return this;
}
setOpenValue(b) {
this.open = b;
return this;
}
isOpen() {
return this.open;
}