Mesh Entry

1// MVP: exact raster entry position and smooth mesh normal. The erosion/SDF path remains
2// the fallback at every pixel whose original outer surface has been removed.
3import * as THREE from "three/webgpu";
4import { tsl } from "../tsl/t";
5const { pass, mrt, vec4, positionLocal, normalLocal } = tsl;
6export function createMeshEntry(geometry: THREE.BufferGeometry, camera: THREE.Camera) {
7  const scene = new THREE.Scene();
8  const material = new THREE.MeshBasicNodeMaterial();
9  material.side = THREE.FrontSide;
10  material.toneMapped = false;
11  const mesh = new THREE.Mesh(geometry, material);
12  mesh.frustumCulled = false;
13  mesh.matrixAutoUpdate = false;
14  scene.add(mesh);
15  const surfacePass = pass(scene, camera, { type: THREE.FloatType, samples: 0 });
16  surfacePass.setMRT(mrt({ output: vec4(positionLocal, 1), normal: vec4(normalLocal, 0) }));
17  const position = surfacePass.getTextureNode("output"),
18    normal = surfacePass.getTextureNode("normal"),
19    depth = surfacePass.getTextureNode("depth");
20  for (const name of ["output", "normal"]) {
21    const t = surfacePass.getTexture(name);
22    t.minFilter = t.magFilter = THREE.NearestFilter;
23    t.generateMipmaps = false;
24  }
25  return {
26    surfacePass,
27    position,
28    normal,
29    depth,
30    mesh,
31    material,
32    update(source: THREE.Mesh, scale: number) {
33      mesh.geometry = source.geometry;
34      mesh.matrix.copy(source.matrixWorld);
35      mesh.matrixWorld.copy(source.matrixWorld);
36      mesh.visible = source.visible;
37      surfacePass.setResolutionScale(scale);
38    },
39    dispose() {
40      surfacePass.dispose();
41      material.dispose();
42    },
43  };
44}