import { Euler , Object3D , Vector3 , Matrix4 } from 'three' ; import { useRef , useLayoutEffect } from 'react' ; import { useFrame } from '@react-three/fiber' ; import type { InstancedMesh } from 'three' ; import { getState , mutation , useStore } from '../store' ; import type { Controls } from '../store' ; const e = new Euler ( ) ; const m = new Matrix4 ( ) ; const o = new Object3D ( ) ; const v = new Vector3 ( ) ; interface SkidProps { count ? : number ; opacity ? : number ; size ? : number ; } export function Skid ( { count = 500 , opacity = 0.5 , size = 0.4 } ) { const ref = useRef < InstancedMesh > ( null ) ; const [ chassisBody , wheels ] = useStore ( ( state ) => [ state . chassisBody , state . wheels ] ) ; let brake ; let index = 0 ; useFrame ( ( ) => { brake = getState ( ) . controls . brake ; if ( chassisBody . current && wheels [ 2 ] . current && wheels [ 3 ] . current && brake && mutation . speed > 10 ) { e . setFromRotationMatrix ( m . extractRotation ( chassisBody . current . matrix ) ) ; setItemAt ( ref . current ! , e , wheels [ 2 ] . current , index ++ ) ; setItemAt ( ref . current ! , e , wheels [ 3 ] . current , index ++ ) ; if ( index === count ) index = 0 ; } } ) ; useLayoutEffect ( ( ) => { ref . current ! . geometry . rotateX ( - Math . PI / 2 ) ; return ( ) => { ref . current ! . geometry . rotateX ( Math . PI / 2 ) ; } ; } ) ; return ( < instancedMesh ref = { ref } args = { [ undefined , undefined , count ] } > < planeGeometry args = { [ size , size * 2 ] } /> < meshBasicMaterial color = "black" transparent opacity = { opacity } depthWrite = { false } / > < /instancedMesh>); } function setItemAt ( instances , rotation , wheel , index ) { o . position . copy ( wheel . getWorldPosition ( v ) ) ; o . rotation . copy ( rotation ) ; o . scale . setScalar ( 1 ) ; o . updateMatrix ( ) ; instances . setMatrixAt ( index , o . matrix ) ; instances . instanceMatrix . needsUpdate = true ; }