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/**
* Application
*/
import React, { useState, useEffect } from "react";
import * as THREE from "three";
import { MTLLoader, OBJLoader } from "@hbis/three-obj-mtl-loader";
import Graph from "./Graph.js";
import Intro from "./Intro.js";
import LandscapeWarning from "./LandscapeWarning.js";
export default function App() {
const [db, setDb] = useState(null);
const [intro, setIntro] = useState(true);
useEffect(async () => {
const newDb = await loadDB();
await loadObjects(newDb);
setDb(newDb);
}, []);
const closeIntro = () => {
setIntro(false);
};
return (
<>
{intro && <Intro onComplete={closeIntro} />}
{!intro && db && <Graph db={db} />}
<LandscapeWarning />
</>
);
}
async function loadDB() {
const request = await fetch("/assets/db.json");
return await request.json();
}
async function loadObjects(db) {
await Promise.all(
db.page.reduce((promises, item) => {
if (item.threeObject) {
promises.push(loadObject(item));
}
return promises;
}, [])
);
}
function loadObject(item) {
return new Promise((resolve) => {
let { path, file } = item.threeObject;
path = "assets/" + path;
const manager = new THREE.LoadingManager();
manager.setURLModifier((url) => {
if (!url.match("/")) {
url = path + url;
}
return url;
});
const mtlLoader = new MTLLoader(manager);
const objLoader = new OBJLoader(manager);
mtlLoader.setMaterialOptions({ side: THREE.FrontSide });
mtlLoader.load(file.replace(".obj", ".mtl"), (materials) => {
materials.preload();
objLoader.setMaterials(materials);
objLoader.load(file, (object) => {
object.children.forEach((child) => (child.material.transparent = true));
item.object = object;
resolve();
});
});
});
}
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