@threlte/extras/dist/bvh/bvh.svelte.js

Utilities, abstractions and plugins for your Threlte apps

import { injectPlugin, isInstanceOf } from '@threlte/core';
import { SAH } from 'three-mesh-bvh';
import { createBatchedMeshBVH, createMeshBVH, createPointsBVH } from './raycast.js';
export const bvh = (options) => {
    const bvhOptions = $derived({
        helper: false,
        enabled: true,
        strategy: SAH,
        verbose: false,
        setBoundingBox: true,
        maxDepth: 20,
        maxLeafTris: 10,
        indirect: false,
        ...options?.()
    });
    injectPlugin('bvh-raycast', (pluginProps) => {
        const ref = $derived(pluginProps.ref);
        const opts = $derived(pluginProps.props.bvh ? { ...bvhOptions, ...pluginProps.props.bvh } : bvhOptions);
        $effect(() => {
            if (!opts.enabled) {
                return;
            }
            if (isInstanceOf(ref, 'Mesh')) {
                return createMeshBVH(ref, opts);
            }
            else if (isInstanceOf(ref, 'BatchedMesh')) {
                return createBatchedMeshBVH(ref, opts);
            }
            else if (isInstanceOf(ref, 'Points')) {
                return createPointsBVH(ref, opts);
            }
            return;
        });
    });
};