[英]Looping in JavaScript on 3D objects
我是 Three Js 的初學者。
在代碼中,當我單擊按鈕 +1時,您可以看到 object 在 1 個房間后移動/更改其位置。 現在我想這樣做,每當我單擊按鈕 +2時,他們應該在 2 個房間后更改 position。
這是我的代碼: https://codesandbox.io/s/2nddddddd-7ydbr2
這是文件:
import React, { Suspense, useEffect, useMemo, useRef, useState } from "react";
import { Canvas } from "@react-three/fiber";
import { ContactShadows, OrbitControls, useGLTF } from "@react-three/drei";
import "./PartOne.css";
import { RoomOne } from "../assets/Room1";
import { Room2 } from "../assets/Room2";
import { Room3 } from "../assets/Room3";
import { Room4 } from "../assets/Room4";
import { Room5 } from "../assets/Room5";
import { Room6 } from "../assets/Room6";
import { Room7 } from "../assets/Room7";
import { Room8 } from "../assets/Room8";
const PartOne = () => {
const [rooms, setRooms] = useState([
RoomOne,
Room2,
Room3,
Room4,
Room5,
Room6,
Room7,
Room8
]);
const positions = useMemo(() => [
[0.0, 0.0, 0.0],
[-3.6, -2.7, 0.0],
[-0.0, -2.7, 3.6],
[-7.2, -5.4, 0.0],
[-3.6, -5.4, 3.6],
[-0.0, -5.4, 7.2],
[-7.2, -8.1, 3.6],
[-3.6, -8.11, 7.2]
]);
useEffect(() => {
console.log("rooms state:", rooms);
}, [rooms]);
return (
<div className="wrapper">
<button
onClick={() => {
let arr = [...rooms];
arr.unshift(arr.pop());
console.log("arr::", arr);
setRooms(arr);
}}
>
Button +1
</button>
<button
onClick={() => {
let arr = [...rooms];
arr.unshift(arr.pop());
console.log("arr::", arr);
setRooms(arr);
}}
>
Button +2
</button>
<Canvas shadows camera={{ fov: 70, position: [0, 0, 30] }}>
<Suspense fallback={null}>
<ambientLight intensity={0.3} />
<directionalLight
castShadow
receiveShadow
intensity={2}
position={[80, 80, 80]}
shadow-normalBias={0.1}
shadow-camera-left={-12}
shadow-camera-right={12}
shadow-camera-top={12}
shadow-camera-bottom={-12}
shadow-camera-near={0.5}
shadow-camera-far={200}
/>
{console.log("rooms render", rooms)}
{rooms.map((room, roomIndex) =>
room({ position: positions[roomIndex] })
)}
<ContactShadows />
</Suspense>
<OrbitControls enablePan={true} enableZoom={true} enableRotate={true} />
</Canvas>
</div>
);
};
export default PartOne;
基本上你想根據旋轉次數旋轉你的數組。
所以你可以像這樣使用 function
const rotate = function (arr, numberOfShifts) { let tmp = 0; const leng = arr.length; numberOfShifts = numberOfShifts % leng; for (let i = 0; i < numberOfShifts; i++) { tmp = arr.pop(); arr.unshift(tmp); } return arr; }; const arr = [1,2,3,4,5] console.log(rotate(arr, 1)) console.log(rotate(arr, 2))
在你的代碼中而不是這個arr.unshift(arr.pop());
調用此 function rotate(arr, 1)
button 1
和rotate(arr, 2)
button 2
更新了您的代碼:
import React, { Suspense, useEffect, useMemo, useRef, useState } from "react"; import { Canvas } from "@react-three/fiber"; import { ContactShadows, OrbitControls, useGLTF } from "@react-three/drei"; import "./PartOne.css"; import { RoomOne } from "../assets/Room1"; import { Room2 } from "../assets/Room2"; import { Room3 } from "../assets/Room3"; import { Room4 } from "../assets/Room4"; import { Room5 } from "../assets/Room5"; import { Room6 } from "../assets/Room6"; import { Room7 } from "../assets/Room7"; import { Room8 } from "../assets/Room8"; const PartOne = () => { const [rooms, setRooms] = useState([ RoomOne, Room2, Room3, Room4, Room5, Room6, Room7, Room8 ]); const positions = useMemo(() => [ [0.0, 0.0, 0.0], [-3.6, -2.7, 0.0], [-0.0, -2.7, 3.6], [-7.2, -5.4, 0.0], [-3.6, -5.4, 3.6], [-0.0, -5.4, 7.2], [-7.2, -8.1, 3.6], [-3.6, -8.11, 7.2] ]); useEffect(() => { console.log("rooms state:", rooms); }, [rooms]); const rotate = function (arr, numberOfShifts) { let tmp = 0; const leng = arr.length; numberOfShifts = numberOfShifts % leng; for (let i = 0; i < numberOfShifts; i++) { tmp = arr.pop(); arr.unshift(tmp); } return arr; }; return ( <div className="wrapper"> <button onClick={() => { let arr = [...rooms]; rotate(arr,1) console.log("arr::", arr); setRooms(arr); }} > Button +1 </button> <button onClick={() => { let arr = [...rooms]; rotate(arr,2) console.log("arr::", arr); setRooms(arr); }} > Button +2 </button> <Canvas shadows camera={{ fov: 70, position: [0, 0, 30] }}> <Suspense fallback={null}> <ambientLight intensity={0.3} /> <directionalLight castShadow receiveShadow intensity={2} position={[80, 80, 80]} shadow-normalBias={0.1} shadow-camera-left={-12} shadow-camera-right={12} shadow-camera-top={12} shadow-camera-bottom={-12} shadow-camera-near={0.5} shadow-camera-far={200} /> {console.log("rooms render", rooms)} {rooms.map((room, roomIndex) => room({ position: positions[roomIndex] }) )} <ContactShadows /> </Suspense> <OrbitControls enablePan={true} enableZoom={true} enableRotate={true} /> </Canvas> </div> ); }; export default PartOne;
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