Function getRayCollisionMesh

src/math/index.ts:476–502

(ray: Ray, model: Model)

}

export function getRayCollisionMesh(ray: Ray, model: Model): RayHit {
  const noHit: RayHit = { hit: false, distance: 0, point: { x: 0, y: 0, z: 0 }, normal: { x: 0, y: 0, z: 0 } };
  const data = _meshData.get(model.handle);
  if (!data) return noHit;

  let closest = noHit;
  const verts = data.vertices;
  const idxs = data.indices;

  // Each vertex is 12 floats: x,y,z, nx,ny,nz, r,g,b,a, u,v
  for (let i = 0; i < idxs.length; i += 3) {
    const i0 = idxs[i] * 12;
    const i1 = idxs[i + 1] * 12;
    const i2 = idxs[i + 2] * 12;

    const v0: Vec3 = { x: verts[i0], y: verts[i0 + 1], z: verts[i0 + 2] };
    const v1: Vec3 = { x: verts[i1], y: verts[i1 + 1], z: verts[i1 + 2] };
    const v2: Vec3 = { x: verts[i2], y: verts[i2 + 1], z: verts[i2 + 2] };

    const hit = rayIntersectsTriangle(ray, v0, v1, v2);
    if (hit.hit && (!closest.hit || hit.distance < closest.distance)) {
      closest = hit;
    }
  }

  return closest;
}