Generate a point cloud in glTF format, using glTF Transform.

generate-points.ts

import { Document, NodeIO, Primitive } from '@gltf-transform/core';

const document = new Document();
const buffer = document.createBuffer();

const position = document.createAccessor()
	.setType('VEC3')
	.setBuffer(buffer)
	.setArray(new Float32Array([
		0, 0, 0, // ax,ay,az
		0, 0, 1, // bx,by,bz
		0, 1, 0, // ...
		1, 0, 0,
	]));

const color = document.createAccessor()
	.setType('VEC4')
	.setBuffer(buffer)
	.setNormalized(true)
	.setArray(new Uint8Array([
		0, 0, 0, 255,
		0, 0, 255, 255,
		0, 255, 0, 255,
		255, 0, 0, 255,
	]));

const prim = document
	.createPrimitive()
	.setMode(Primitive.Mode.POINTS)
	.setAttribute('POSITION', position)
	.setAttribute('COLOR_0', color);

const mesh = document.createMesh().addPrimitive(prim);
const node = document.createNode().setMesh(mesh);
const scene = document.createScene().addChild(node);
document.getRoot().setDefaultScene(scene);

const io = new NodeIO();
await io.write('./points.glb', document);