Looping in JavaScript on 3D objects

Question

I'm a beginner at Three Js.

In the code when I click Button +1 you can see the object moves/changes its positions after 1 room. Now I want to do this, Whenever I click Button +2 they should change position after 2 rooms.

Here's what I mean

This is my code: https://codesandbox.io/s/2ndddddd-7ydbr2

Here's the file:

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;

Is it okay now? Can you please help me with it?

Sayedul Karim
– Sayedul Karim

2023-01-02 11:21:32 +00:00
Commented Jan 2, 2023 at 11:21 — Sayedul Karim
– Sayedul Karim, Commented Jan 2, 2023 at 11:21

karthik · Accepted Answer · 2023-01-02 11:33:53Z

basically you want to rotate your array based on the number of times to rotate.

so you can use a function like this

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))

In your code instead of this arr.unshift(arr.pop());

call this function rotate(arr, 1) for button 1 and rotate(arr, 2) for button 2

updated your code:

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;

You are awesome Man. People like you are rare to find. Thank You!!!
Hello there. Can you please check this question too? stackoverflow.com/questions/75060084/… Thank Youuu

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