I am trying to create a scene with react-three/fiber and react-three/drei. I want to use a PerspectiveCamera and be able to pan/zoom/rotate with the mouse, but I am also trying to add some buttons that can update the camera position and target in order to have different views (eg. top view, bottom view, side view, etc). I have achieved the latter part and my buttons seem to be working as I update the target x,y,z and position x,y,z using props.
The only problem is that the camera is not responding to the mouse so I only get a fixed camera position and target.
I have included all the scene codes below.
import React,{ useRef, useState, useEffect} from 'react'
import * as THREE from 'three';
import PropTypes from 'prop-types';
import { withRouter } from 'react-router-dom';
import { PerspectiveCamera, Icosahedron, OrbitControls } from '@react-three/drei'
import { Canvas, useThree } from "@react-three/fiber";
function VisualizationComponent(props) {
const width = window.innerWidth;
const height = window.innerHeight;
const [controls, setControls] = useState(null);
const [threeState, setThreeState] = useState(null);
const [treeStateInitialized, setThreeStateInitialized] = useState(false);
useEffect(()=>{
if(threeState){
_.forOwn(props.objects, (value, key) => {
threeState.scene.current.add(value);
});
}
return () => {
if(controls) controls.dispose();
}
},[])
function usePrevious(value) {
const ref = useRef();
useEffect(() => {
ref.current = value;
});
return ref.current;
}
const { objects } = props
const prevState = usePrevious({objects});
const mainCamera = useRef();
useEffect(() => {
if(!threeState) return;
if (
!treeStateInitialized ||
shouldUpdateObjects(props.objects, prevState.objects)
) {
setThreeStateInitialized(true);
garbageCollectOldObjects();
addDefaultObjects();
_.forOwn(props.objects, (value, key) => {
threeState.scene.add(value);
});
}
})
const addDefaultObjects = () => {
if (threeState) {
var hemiLight = new THREE.HemisphereLight( 0xffffbb, 0x080820, 0.2 );
hemiLight.position.set( 0, 0, 1 );
threeState.scene.add( hemiLight );
}
}
const garbageCollectOldObjects = () => {
while (threeState && threeState.scene.children.length) {
const oldObject = threeState.scene.children[0];
oldObject.traverse((child) => {
if (child.geometry) {
child.geometry?.dispose();
if(child.material && Array.isArray(child.material)){
child.material.forEach(d => d.dispose());
}else{
child.material?.dispose();
}
}
});
threeState.scene.remove(oldObject);
}
}
const shouldUpdateObjects = (currentObjects,nextObjects) => {
const result = false;
let currentDigest = 1;
let nextDigest = 1;
_.forIn(currentObjects, (value, key) => {
currentDigest *= value.id;
});
_.forIn(nextObjects, (value, key) => {
nextDigest *= value.id;
});
return currentDigest !== nextDigest;
}
const hasAncestorWhichDisablesThreeJs = (element) => {
if (!element) return false;
let isEditable = false;
for (let i = 0; i < element.classList.length; i++) {
if (element.classList[i] === 'disable-threejs-controls') {
isEditable = true;
}
}
return isEditable ||
hasAncestorWhichDisablesThreeJs(element.parentElement);
}
const initializeScene = (state) => {
setThreeState(state);
addDefaultObjects();
}
return (
<div
id="threejs-controllers-div"
className='threejs-container'
onMouseOver={ (e) => {
const target = e.target;
if (!target || !controls) return true;
if (hasAncestorWhichDisablesThreeJs(target)) {
controls.enabled = false;
} else {
controls.enabled = true;
}
} }
>
<Canvas
className='threejs'
onCreated={ (state) => {initializeScene(state)}}
shadows={true}
gl={
{
'shadowMap.enabled' : true,
'alpha' : true
}
}
>
<PerspectiveCamera
makeDefault
ref={mainCamera}
position-x={props.cameraX || 0}
position-y={props.cameraY || -20}
position-z={props.cameraZ || 20}
up={[0, 0, 1]}
fov={ 15 }
aspect={ width / height }
near={ 1 }
far={ 10000 }
visible={false}
controls={controls}
/>
<OrbitControls
ref={controls}
camera={mainCamera.current}
domElement={document.getElementById("threejs-controllers-div")}
enabled={true}
enablePan={true}
enableZoom={true}
enableRotate={true}
target-x={props.targetX || 0}
target-y={props.targetY || 0}
target-z={props.targetZ || 0}
/>
</Canvas>
<div className='threejs-react-container'>
{ props.children }
</div>
</div>
)
}
VisualizationComponent.propTypes = {
children: PropTypes.node.isRequired,
objects: PropTypes.object.isRequired,
cameraX: PropTypes.number,
cameraY: PropTypes.number,
cameraZ: PropTypes.number,
targetX: PropTypes.number,
targetY: PropTypes.number,
targetZ: PropTypes.number,
};
export default withRouter(VisualizationComponent);