Re-compute of UVs:
const geometry = new THREE.ShapeGeometry(heartShape);
let pos = geometry.attributes.position;
let b3 = new THREE.Box3().setFromBufferAttribute(pos);
let b3size = new THREE.Vector3();
b3.getSize(b3size);
let uv = [];
for(let i = 0; i < pos.count; i++){
let x = pos.getX(i);
let y = pos.getY(i);
let u = (x - b3.min.x) / b3size.x;
let v = (y - b3.min.y) / b3size.y;
uv.push(u, v);
}
geometry.setAttribute("uv", new THREE.Float32BufferAttribute(uv, 2));
gives this:
