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document body style height 400pt var sciptList https cdnjs cloudflare com ajax libs three js r128 three min js https threejs org examples js controls OrbitControls js https threejs org examples js loaders GLTFLoader js function loadScripts sc if sc sciptList length 1 main return console log script loaded sc let script document createElement script script type text javascript script src sciptList sc script onload function loadScripts sc 1 document head appendChild script loadScripts 0 function main console log Starting main const scene new THREE Scene scene background new THREE Color blue const renderer new THREE WebGLRenderer renderer setSize window innerWidth window innerHeight document body appendChild renderer domElement const fov 45 const aspect 2 the canvas default const near 0 1 const far 100 const camera new THREE PerspectiveCamera fov aspect near far camera position set 0 10 20 const controls new THREE OrbitControls camera renderer domElement console log controls controls controls target set 0 5 0 controls update const planeSize 40 const loader new THREE TextureLoader const texture loader load https threejsfundamentals org threejs resources images checker png texture wrapS THREE RepeatWrapping texture wrapT THREE RepeatWrapping texture magFilter THREE NearestFilter const repeats planeSize 2 texture repeat set repeats repeats const planeGeo new THREE PlaneGeometry planeSize planeSize const planeMat new THREE MeshPhongMaterial map texture side THREE DoubleSide const mesh new THREE Mesh planeGeo planeMat mesh rotation x Math PI 5 scene add mesh const skyColor 0xB1E1FF light blue const groundColor 0xB97A20 brownish orange const intensity 1 const light new THREE HemisphereLight skyColor groundColor intensity scene add light const color 0xFFFFFF const intensity 1 const light new THREE DirectionalLight color intensity light position set 5 10 2 scene add light scene add light target function frameArea sizeToFitOnScreen boxSize boxCenter camera const halfSizeToFitOnScreen sizeToFitOnScreen 0 5 const halfFovY THREE MathUtils degToRad camera fov 5 const distance halfSizeToFitOnScreen Math tan halfFovY compute a unit vector that points in the direction the camera is now in the xz plane from the center of the box const direction new THREE Vector3 subVectors camera position boxCenter multiply new THREE Vector3 1 0 1 normalize move the camera to a position distance units way from the center in whatever direction the camera was from the center already camera position copy direction multiplyScalar distance add boxCenter pick some near and far values for the frustum that will contain the box camera near boxSize 100 camera far boxSize 100 camera updateProjectionMatrix point the camera to look at the center of the box camera lookAt boxCenter x boxCenter y boxCenter z let curve let curveObject const controlPoints 1 118281 5 115846 3 681386 3 948875 5 115846 3 641834 3 960072 5 115846 0 240352 3 985447 5 115846 4 585005 3 793631 5 115846 4 585006 3 826839 5 115846 14 736200 14 542292 5 115846 14 765865 14 520929 5 115846 3 627002 5 452815 5 115846 3 634418 5 467251 5 115846 4 549161 13 266233 5 115846 4 567083 13 250067 5 115846 13 499271 4 081842 5 115846 13 435463 4 125436 5 115846 5 334928 14 521364 5 115846 5 239871 14 510466 5 115846 5 486727 5 745666 5 115846 5 510492 5 787942 5 115846 14 728308 5 423720 5 115846 14 761919 5 373599 5 115846 3 704133 1 004861 5 115846 3 641834 const p0 new THREE Vector3 const p1 new THREE Vector3 curve new THREE CatmullRomCurve3 controlPoints map p ndx p0 set p p1 set controlPoints ndx 1 controlPoints length return new THREE Vector3 copy p0 new THREE Vector3 lerpVectors p0 p1 0 1 new THREE Vector3 lerpVectors p0 p1 0 9 flat true const points curve getPoints 250 const geometry new THREE BufferGeometry setFromPoints points const material new THREE LineBasicMaterial color 0xff0000 curveObject new THREE Line geometry material curveObject scale set 100 100 100 curveObject position y 621 curveObject visible false material depthTest false curveObject renderOrder 1 scene add curveObject const cars const gltfLoader new THREE GLTFLoader gltfLoader load https threejsfundamentals org threejs resources models cartoon lowpoly small city free pack scene gltf gltf const root gltf scene scene add root const loadedCars root getObjectByName Cars const fixes prefix Car 08 y 0 rot Math PI 5 0 Math PI 5 prefix CAR 03 y 33 rot 0 Math PI 0 prefix Car 04 y 40 rot 0 Math PI 0 root updateMatrixWorld for const car of loadedCars children slice const fix fixes find fix car name startsWith fix prefix const obj new THREE Object3D car position set 0 fix y 0 car rotation set fix rot obj add car scene add obj cars push obj compute the box that contains all the stuff from root and below const box new THREE Box3 setFromObject root const boxSize box getSize new THREE Vector3 length const boxCenter box getCenter new THREE Vector3 set the camera to frame the box frameArea boxSize 0 5 boxSize boxCenter camera update the Trackball controls to handle the new size controls maxDistance boxSize 10 controls target copy boxCenter controls update function resizeRendererToDisplaySize renderer const canvas renderer domElement const width canvas clientWidth const height canvas clientHeight const needResize canvas width width canvas height height if needResize renderer setSize width height false return needResize create 2 Vector3s we can use for path calculations const carPosition new THREE Vector3 const carTarget new THREE Vector3 function render time time 0 001 convert to seconds if resizeRendererToDisplaySize renderer const canvas renderer domElement camera aspect canvas clientWidth canvas clientHeight camera updateProjectionMatrix const pathTime time 01 const targetOffset 0 01 cars forEach car ndx a number between 0 and 1 to evenly space the cars const u pathTime ndx cars length get the first point curve getPointAt u 1 carPosition carPosition applyMatrix4 curveObject matrixWorld get a second point slightly further down the curve curve getPointAt u targetOffset 1 carTarget carTarget applyMatrix4 curveObject matrixWorld put the car at the first point temporarily car position copy carPosition point the car the second point car lookAt carTarget put the car between the 2 points car position lerpVectors carPosition carTarget 0 5 renderer render scene camera requestAnimationFrame render render 0

6 5 115846 5 510492 5 787942 5 115846 14 728308 5 423720 5 115846 14 761919 5 373599 5 115846 3 704133 1 004861 5 115846 3 641834 const p0 new THREE Vector3 const p1 new THREE Vector3 curve new THREE CatmullRomCurve3 controlPoints map p ndx p0 set p p1 set controlPoints ndx 1 controlPoints length return new THREE Vector3 copy p0 new THREE Vector3 lerpVectors p0 p1 0 1 new THREE Vector3 lerpVectors p0 p1 0 9 flat true const points curve getPoints 250 const geometry new THREE BufferGeometry setFromPoints points const material new THREE LineBasicMaterial color 0xff0000 curveObject new THREE Line geometry material curveObject scale set 100 100 100 curveObject position y 621 curveObject visible false material depthTest false curveObject renderOrder 1 scene add curveObject const cars const gltfLoader new THREE GLTFLoader gltfLoader load https threejsfundamentals org threejs resources models cartoon lowpoly small city free pack scene gltf gltf const root gltf scene scene add root const loadedCars root getObjectByName Cars const fixes prefix Car 08 y 0 rot Math PI 5 0 Math PI 5 prefix CAR 03 y 33 rot 0 Math PI 0 prefix Car 04 y 40 rot 0 Math PI 0 root updateMatrixWorld for const car of loadedCars children slice const fix fixes find fix car name startsWith fix prefix const obj new THREE Object3D car position set 0 fix y 0 car rotation set fix rot obj add car scene add obj cars push obj compute the box that contains all the stuff from root and below const box new THREE Box3 setFromObject root const boxSize box getSize new THREE Vector3 length const boxCenter box getCenter new THREE Vector3 set the camera to frame the box frameArea boxSize 0 5 boxSize boxCenter camera update the Trackball controls to handle the new size controls maxDistance boxSize 10 controls target copy boxCenter controls update function resizeRendererToDisplaySize renderer const canvas renderer domElement const width canvas clientWidth const height canvas clientHeight const needResize canvas width width canvas height height if needResize renderer setSize width height false return needResize create 2 Vector3s we can use for path calculations const carPosition new THREE Vector3 const carTarget new THREE Vector3 function render time time 0 001 convert to seconds if resizeRendererToDisplaySize renderer const canvas renderer domElement camera aspect canvas clientWidth canvas clientHeight camera updateProjectionMatrix const pathTime time 01 const targetOffset 0 01 cars forEach car ndx a number between 0 and 1 to evenly space the cars const u pathTime ndx cars length get the first point curve getPointAt u 1 carPosition carPosition applyMatrix4 curveObject matrixWorld get a second point slightly further down the curve curve getPointAt u targetOffset 1 carTarget carTarget applyMatrix4 curveObject matrixWorld put the car at the first point temporarily car position copy carPosition point the car the second point car lookAt carTarget put the car between the 2 points car position lerpVectors carPosition carTarget 0 5 renderer render scene camera requestAnimationFrame render render 0

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