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unitycoder/generate-points.ts

Forked from donmccurdy/generate-points.ts
Created September 4, 2024 19:36
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  1. @donmccurdy donmccurdy created this gist Mar 18, 2024.
    39 changes: 39 additions & 0 deletions generate-points.ts
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,39 @@
    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);