import {
Mesh,
DataTexture,
CircleGeometry,
InstancedBufferGeometry,
InstancedBufferAttribute,
} from "three";
import { Node } from "../graph/types";
import createPickingMaterial from "../materials/createPickingMaterial";
export default function createPickingMesh(
nodes: Node[],
nodePositionsTexture: DataTexture,
nodeColors: Float32Array,
initialCameraDistance: number
): Mesh {
const nodeGeom = new CircleGeometry(2, 16);
const geom = new InstancedBufferGeometry();
geom.index = nodeGeom.index;
geom.instanceCount = nodes.length;
geom.setAttribute("position", nodeGeom.attributes.position);
geom.setAttribute("uv", nodeGeom.attributes.uv);
geom.setAttribute("nodeColor", new InstancedBufferAttribute(nodeColors, 3));
const pickingMaterial = createPickingMaterial(
nodePositionsTexture,
initialCameraDistance
);
const pickingMesh = new Mesh(geom, pickingMaterial);
pickingMesh.frustumCulled = false;
return pickingMesh;
}
