THREE.JS | Delaunator.JS THREE.BufferGeometry UV mapping - three.js

Question

That's really weird, but I couldn't find any solution for uv mapping Delaunator.JS outputs.
Let's say I have a very basic set of points defined by:
for(var z = -512; z <= 512; z += 256){
for(var x = -512; x <= 512; x += 256){
points.push(new THREE.Vector3(x, 0, z));
}
}
points.push(new THREE.Vector3(512, 0, -384));
points.push(new THREE.Vector3(128, 0, 512));
points.push(new THREE.Vector3(384, 0, 512));
While, subdivision points go after, I need to process these points through Delaunator.JS in order to to build be able to generate a THREE.BufferGeometry plane.
Them I'm trying to generate UV map by:
for(var i = 0; i < indexDelaunay.triangles.length; i += 3){
var a = new THREE.Vector3(points[indexDelaunay.triangles[i]].x, points[indexDelaunay.triangles[i]].y, points[indexDelaunay.triangles[i]].z);
var b = new THREE.Vector3(points[indexDelaunay.triangles[i + 2]].x, points[indexDelaunay.triangles[i + 1]].y, points[indexDelaunay.triangles[i + 1]].z);
var c = new THREE.Vector3(points[indexDelaunay.triangles[i + 1]].x, points[indexDelaunay.triangles[i + 2]].y, points[indexDelaunay.triangles[i + 2]].z);
a.x = remapFloat(a.x, -512, 512, 0, 1);
a.z = remapFloat(a.z, -512, 512, 1, 0);
b.x = remapFloat(b.x, -512, 512, 0, 1);
b.z = remapFloat(b.z, -512, 512, 1, 0);
c.x = remapFloat(c.x, -512, 512, 0, 1);
c.z = remapFloat(c.z, -512, 512, 1, 0);
var mm = {min: {x: Number.POSITIVE_INFINITY, z: Number.POSITIVE_INFINITY}, max: {x: Number.NEGATIVE_INFINITY, z: Number.NEGATIVE_INFINITY} }
mm.min.x = Math.min(mm.min.x, a.x, b.x, c.x);
mm.min.z = Math.min(mm.min.z, a.z, b.z, c.z);
mm.max.x = Math.max(mm.max.x, a.x, b.x, c.x);
mm.max.z = Math.max(mm.max.z, a.z, b.z, c.z);
quad_uvs.push(mm.min.x, mm.min.z, mm.max.x, mm.max.z);
}
uvs = new Float32Array(quad_uvs);
geometry.setAttribute( 'uv', new THREE.BufferAttribute( uvs, 2 ) );
The output is glitchy, meaning that I'm doing something wrong:
The output should be like this:
The code is attached.
var texture = 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var renderer, scene, camera, controls, loader, terrain, glsl, uniforms, root, tree;
renderer = new THREE.WebGLRenderer({
antialias: true
});
renderer.setPixelRatio(window.devicePixelRatio);
renderer.setSize(window.innerWidth, window.innerHeight);
renderer.setClearColor(0xDEDEDE);
document.body.appendChild(renderer.domElement);
scene = new THREE.Scene();
loader = new THREE.TextureLoader();
loader.crossOrigin = "";
camera = new THREE.PerspectiveCamera(35, window.innerWidth / window.innerHeight, 1, 51200);
camera.position.set(-3072, 2048, -3072);
controls = new THREE.OrbitControls(camera, renderer.domElement);
controls.enableDamping = true;
controls.dampingFactor = 0.05;
controls.screenSpacePanning = false;
controls.minDistance = 8;
controls.maxDistance = 10240;
controls.maxPolarAngle = Math.PI / 2;
//simple pseudo quadtree
var points = [], indices = [], quad_uvs = [], groups = [], materials = [];
for(var z = -512; z <= 512; z += 256){
for(var x = -512; x <= 512; x += 256){
points.push(new THREE.Vector3(x, 0, z));
}
}
points.push(new THREE.Vector3(512, 0, -384));
points.push(new THREE.Vector3(128, 0, 512));
points.push(new THREE.Vector3(384, 0, 512));
//delaunay
var geometry = new THREE.BufferGeometry().setFromPoints(points);
var indexDelaunay = Delaunator.from(points.map(v => { return [v.x, v.z]; }) );
var meshIndex = [], quad_uvs = [];
for(var i = 0; i < indexDelaunay.triangles.length; i++){ meshIndex.push(indexDelaunay.triangles[i]); }
for(var i = 0; i < indexDelaunay.triangles.length; i += 3){
var a = new THREE.Vector3(points[indexDelaunay.triangles[i]].x, points[indexDelaunay.triangles[i]].y, points[indexDelaunay.triangles[i]].z);
var b = new THREE.Vector3(points[indexDelaunay.triangles[i + 2]].x, points[indexDelaunay.triangles[i + 1]].y, points[indexDelaunay.triangles[i + 1]].z);
var c = new THREE.Vector3(points[indexDelaunay.triangles[i + 1]].x, points[indexDelaunay.triangles[i + 2]].y, points[indexDelaunay.triangles[i + 2]].z);
a.x = remapFloat(a.x, -512, 512, 0, 1);
a.z = remapFloat(a.z, -512, 512, 1, 0);
b.x = remapFloat(b.x, -512, 512, 0, 1);
b.z = remapFloat(b.z, -512, 512, 1, 0);
c.x = remapFloat(c.x, -512, 512, 0, 1);
c.z = remapFloat(c.z, -512, 512, 1, 0);
var mm = {min: {x: Number.POSITIVE_INFINITY, z: Number.POSITIVE_INFINITY}, max: {x: Number.NEGATIVE_INFINITY, z: Number.NEGATIVE_INFINITY} }
mm.min.x = Math.min(mm.min.x, a.x, b.x, c.x);
mm.min.z = Math.min(mm.min.z, a.z, b.z, c.z);
mm.max.x = Math.max(mm.max.x, a.x, b.x, c.x);
mm.max.z = Math.max(mm.max.z, a.z, b.z, c.z);
quad_uvs.push(mm.min.x, mm.min.z, mm.max.x, mm.max.z);
}
uvs = new Float32Array(quad_uvs);
geometry.setAttribute( 'uv', new THREE.BufferAttribute( uvs, 2 ) );
geometry.setIndex(meshIndex);
geometry.computeVertexNormals();
var plane = new THREE.Mesh(geometry, new THREE.MeshBasicMaterial({ map: new THREE.TextureLoader().load(texture)}));
scene.add(plane);
animate();
function animate(){
controls.update();
renderer.render(scene, camera);
requestAnimationFrame(animate);
}
function remapFloat(v_, min0_, max0_, min1_, max1_) { return min1_ + (v_ - min0_) / (max0_ - min0_) * (max1_ - min1_); }
body { margin: 0; }
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>GLSL Intersection</title>
<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no" />
<script src="https://unpkg.com/three#0.116.0/build/three.min.js"></script>
<script src="https://unpkg.com/three#0.116.0/examples/js/controls/OrbitControls.js"></script>
<script src="https://cdn.jsdelivr.net/npm/delaunator#4.0.1/delaunator.min.js"></script>
</head>
<body>
</body>
</html>

Answer 1

I was wrong by generating quad_uvs via triangles. The solution is simpler.
for(var j = 0; j < points.length; j++){
var qx = remapFloat(points[j].x, -512, 512, 1, 0);
var qz = remapFloat(points[j].z, -512, 512, 0, 1);
quad_uvs.push(...[qx, qz]);
}
var texture = 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var renderer, scene, camera, controls, loader, terrain, glsl, uniforms, root, tree;
renderer = new THREE.WebGLRenderer({
antialias: true
});
renderer.setPixelRatio(window.devicePixelRatio);
renderer.setSize(window.innerWidth, window.innerHeight);
renderer.setClearColor(0xDEDEDE);
document.body.appendChild(renderer.domElement);
scene = new THREE.Scene();
loader = new THREE.TextureLoader();
loader.crossOrigin = "";
camera = new THREE.PerspectiveCamera(35, window.innerWidth / window.innerHeight, 1, 51200);
camera.position.set(-3072, 2048, -3072);
controls = new THREE.OrbitControls(camera, renderer.domElement);
controls.enableDamping = true;
controls.dampingFactor = 0.05;
controls.screenSpacePanning = false;
controls.minDistance = 8;
controls.maxDistance = 10240;
controls.maxPolarAngle = Math.PI / 2;
//simple pseudo quadtree
var points = [], indices = [], quad_uvs = [], groups = [], materials = [];
for(var z = -512; z <= 512; z += 256){
for(var x = -512; x <= 512; x += 256){
points.push(new THREE.Vector3(x, 0, z));
}
}
points.push(new THREE.Vector3(512, 0, -384));
points.push(new THREE.Vector3(128, 0, 512));
points.push(new THREE.Vector3(384, 0, 512));
//delaunay
var geometry = new THREE.BufferGeometry().setFromPoints(points);
var indexDelaunay = Delaunator.from(points.map(v => { return [v.x, v.z]; }) );
var meshIndex = [], quad_uvs = [];
for(var i = 0; i < indexDelaunay.triangles.length; i++){ meshIndex.push(indexDelaunay.triangles[i]); }
for(var j = 0; j < points.length; j++){
var qx = remapFloat(points[j].x, -512, 512, 1, 0);
var qz = remapFloat(points[j].z, -512, 512, 0, 1);
quad_uvs.push(...[qx, qz]);
}
uvs = new Float32Array(quad_uvs);
geometry.setAttribute( 'uv', new THREE.BufferAttribute( uvs, 2 ) );
geometry.setIndex(meshIndex);
geometry.computeVertexNormals();
var plane = new THREE.Mesh(geometry, new THREE.MeshBasicMaterial({ map: new THREE.TextureLoader().load(texture)}));
scene.add(plane);
animate();
function animate(){
controls.update();
renderer.render(scene, camera);
requestAnimationFrame(animate);
}
function remapFloat(v_, min0_, max0_, min1_, max1_) { return min1_ + (v_ - min0_) / (max0_ - min0_) * (max1_ - min1_); }
body { margin: 0; }
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>GLSL Intersection</title>
<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no" />
<script src="https://unpkg.com/three#0.116.0/build/three.min.js"></script>
<script src="https://unpkg.com/three#0.116.0/examples/js/controls/OrbitControls.js"></script>
<script src="https://cdn.jsdelivr.net/npm/delaunator#4.0.1/delaunator.min.js"></script>
</head>
<body>
</body>
</html>