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Merge pull request #739 from zeux/simplify-viz

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demo: Improve simplification demo visualization
This commit is contained in:
Arseny Kapoulkine
2024-08-19 09:08:07 -07:00
committed by GitHub
parent 9a0bea3aa8 ea385ce376
commit 89b8fa1fcb
3 changed files with 122 additions and 25 deletions
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demo/simplify.html
+120 -25
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@@ -50,6 +50,7 @@
import * as THREE from 'three';
import { GLTFLoader } from 'three-examples/loaders/GLTFLoader.js';
import { OrbitControls } from 'three-examples/controls/OrbitControls.js';
import { mergeVertices } from 'three-examples/utils/BufferGeometryUtils.js';
import { MeshoptDecoder } from '../js/meshopt_decoder.module.js';
import { MeshoptSimplifier } from '../js/meshopt_simplifier.module.js';
import { GUI } from 'https://unpkg.com/lil-gui@0.17.0/dist/lil-gui.esm.js';
@@ -62,7 +63,9 @@
wireframe: false,
pointSize: 1.0,
ratio: 1.0,
debugOverlay: false,
lockBorder: false,
weldVertices: false,
useAttributes: false,
errorThresholdLog10: 1,
normalWeight: 0.5,
@@ -90,16 +93,20 @@
reload();
simplify();
},
autoUpdate: false,
autoUpdateStatus: '',
};
var gui = new GUI({ width: 300 });
var guiDisplay = gui.addFolder('Display');
guiDisplay.add(settings, 'wireframe').onChange(update);
guiDisplay.add(settings, 'pointSize', 1, 16).onChange(update);
guiDisplay.add(settings, 'debugOverlay').onChange(simplify); // requires debug data rebuild
var guiSimplify = gui.addFolder('Simplify');
guiSimplify.add(settings, 'ratio', 0, 1, 0.01).onChange(simplify);
guiSimplify.add(settings, 'lockBorder').onChange(simplify);
guiSimplify.add(settings, 'weldVertices').onChange(simplify);
guiSimplify.add(settings, 'errorThresholdLog10', 0, 3, 0.1).onChange(simplify);
guiSimplify.add(settings, 'useAttributes').onChange(simplify);
guiSimplify.add(settings, 'normalWeight', 0, 2, 0.01).onChange(simplify);
@@ -108,6 +115,8 @@
var guiLoad = gui.addFolder('Load');
guiLoad.add(settings, 'loadFile');
guiLoad.add(settings, 'updateModule');
guiLoad.add(settings, 'autoUpdate').onChange(autoReload);
guiLoad.add(settings, 'autoUpdateStatus').listen();
var guiStats = gui.addFolder('Stats');
guiStats.add(settings.stats, 'triangles').listen();
@@ -119,14 +128,16 @@
animate();
function simplifyMesh(geo) {
if (!geo.index.original) {
geo.index.original = geo.index.array;
if (settings.weldVertices) {
// pre-welding is important for some meshes that have very close normals in adjacent face corners
// for now we use the welder from three.js; this is not as performant as it could be
geo = mergeVertices(geo, 1e-2);
}
var attributes = 6; // 3 color, 3 normal
var positions = new Float32Array(geo.attributes.position.array);
var indices = geo.index.original;
var indices = new Uint32Array(geo.index.array); // needed for _InternalDebug to work
var target = Math.floor((indices.length * settings.ratio) / 3) * 3;
if (settings.useAttributes) {
@@ -166,30 +177,68 @@
console.time('simplify');
var res = settings.useAttributes
? MeshoptSimplifier.simplifyWithAttributes(
indices,
positions,
stride,
attrib,
attributes,
attrib_weights,
null,
target,
threshold,
flags,
)
: MeshoptSimplifier.simplify(indices, positions, stride, target, threshold, flags);
function run() {
var S = MeshoptSimplifier; // to avoid line breaks below...
return settings.useAttributes
? S.simplifyWithAttributes(indices, positions, stride, attrib, attributes, attrib_weights, null, target, threshold, flags)
: MeshoptSimplifier.simplify(indices, positions, stride, target, threshold, flags);
}
var res = run();
if (settings.debugOverlay) {
flags.push('_InternalDebug');
var dres = run();
}
console.timeEnd('simplify');
console.log('simplified to', res[0].length / 3, 'with error', res[1]);
var rgeo = geo.clone();
geo.index.array = res[0];
geo.index.count = res[0].length;
geo.index.needsUpdate = true;
var dind = res[0];
return res[1];
if (settings.debugOverlay) {
// we need extra indices for debug overlay
dind = Array.from(res[0]);
for (var kind = 1; kind <= 4; ++kind) {
var offset = dind.length;
for (var i = 0; i < dres[0].length; i += 3) {
var mask = (1 << 28) - 1;
for (var e = 0; e < 3; ++e) {
var a = dres[0][i + e],
b = dres[0][i + ((e + 1) % 3)];
if (a >> 31 != 0 && ((a >> 28) & 7) == kind) {
// loop of current kind
dind.push(a & mask);
dind.push(a & mask);
dind.push(b & mask);
} else if (kind == 4 && ((a >> 28) & 7) == kind && ((b >> 28) & 7) == kind) {
// locked edge (may not be marked as a loop)
dind.push(a & mask);
dind.push(a & mask);
dind.push(b & mask);
}
}
}
if (offset != dind.length) {
rgeo.addGroup(offset, dind.length - offset, kind);
offset = dind.length;
}
}
}
rgeo.index.array = new Uint32Array(dind);
rgeo.index.count = dind.length;
rgeo.index.needsUpdate = true;
rgeo.addGroup(0, res[0].length, 0);
return [rgeo, res[0].length / 3, res[1]];
}
function simplifyPoints(geo) {
@@ -232,10 +281,29 @@
scene.traverse(function (object) {
if (object.isMesh) {
var err = simplifyMesh(object.geometry);
if (!object.original) {
object.original = object.geometry.clone();
// use small depth offset to avoid overlay z-fighting with the original mesh
// has to be done on the main material as overlays use lines that don't support depth offset
object.material.polygonOffset = true;
object.material.polygonOffsetUnits = 16;
object.material = [
object.material,
new THREE.MeshBasicMaterial({ color: 0x0000ff, wireframe: true }), // border
new THREE.MeshBasicMaterial({ color: 0x00ff00, wireframe: true }), // seam
new THREE.MeshBasicMaterial({ color: 0xff00ff, wireframe: true }), // complex
new THREE.MeshBasicMaterial({ color: 0xff0000, wireframe: true }), // locked
];
}
var [geo, tri, err] = simplifyMesh(object.original);
object.geometry = geo;
error = Math.max(error, err); // note: we are ignoring the possibility of different mesh scales atm
triangles += object.geometry.index.count / 3;
triangles += tri;
vertices += object.geometry.attributes.position.count;
}
if (object.isPoints) {
@@ -262,10 +330,37 @@
});
}
var moduleLastModified = 0;
function autoReload() {
if (!settings.autoUpdate) return;
fetch('/js/meshopt_simplifier.module.js?x=' + Date.now(), { method: 'HEAD' })
.then(function (r) {
var last = r.headers.get('Last-Modified');
if (last != moduleLastModified) {
moduleLastModified = last;
reload();
simplify();
}
settings.autoUpdateStatus = new Date(last).toLocaleTimeString();
setTimeout(autoReload, 1000);
})
.catch(function (e) {
settings.autoUpdateStatus = 'error';
setTimeout(autoReload, 5000);
});
}
function update() {
scene.traverse(function (child) {
if (child.isMesh) {
child.material.wireframe = settings.wireframe;
if (Array.isArray(child.material)) {
child.material[0].wireframe = settings.wireframe;
} else {
child.material.wireframe = settings.wireframe;
}
}
if (child.isPoints) {
child.material.size = settings.pointSize;
js/meshopt_simplifier.js
+1
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@@ -197,6 +197,7 @@ var MeshoptSimplifier = (function () {
LockBorder: 1,
Sparse: 2,
ErrorAbsolute: 4,
_InternalDebug: 1 << 30,
};
return {
js/meshopt_simplifier.module.js
+1
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@@ -196,6 +196,7 @@ var MeshoptSimplifier = (function () {
LockBorder: 1,
Sparse: 2,
ErrorAbsolute: 4,
_InternalDebug: 1 << 30,
};
return {