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Examples : CSG with a GLTF

Description

Demonstrates CSG Operations on a glTF.

GSGMesh GitHub Repository : https://github.com/Sean-Bradley/THREE-CSGMesh

This examples demonstrates,

  • Traversing a gTLF and extracting just the required geometry.
  • CSG Subtract, Union and Intersect Operations on a geometry from a glTF model.
  • Translating a CSG Geometry along an axis before applying the operation.
  • Using the THREE.GridHelper.

Code

./src/client/client.ts

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import * as THREE from 'three'
import { OrbitControls } from 'three/examples/jsm/controls/OrbitControls'
import Stats from 'three/examples/jsm/libs/stats.module'
import { GLTFLoader } from 'three/examples/jsm/loaders/GLTFLoader'
import { CSG } from './utils/CSGMesh'

const scene = new THREE.Scene()

const gridHelper = new THREE.GridHelper(10, 10, 0xaec6cf, 0xaec6cf)

scene.add(gridHelper)

const light1 = new THREE.PointLight()
light1.position.set(5, 10, 5)
scene.add(light1)

const camera = new THREE.PerspectiveCamera(
    75,
    window.innerWidth / window.innerHeight,
    0.1,
    1000
)
camera.position.x = 0
camera.position.y = 3
camera.position.z = 3

const renderer = new THREE.WebGLRenderer()
renderer.setSize(window.innerWidth, window.innerHeight)
document.body.appendChild(renderer.domElement)

const controls = new OrbitControls(camera, renderer.domElement)
controls.enableDamping = true
controls.target.set(0, 1.5, 0)

const envTexture = new THREE.CubeTextureLoader().load([
    'img/px_25.jpg',
    'img/nx_25.jpg',
    'img/py_25.jpg',
    'img/ny_25.jpg',
    'img/pz_25.jpg',
    'img/nz_25.jpg'
])
envTexture.mapping = THREE.CubeReflectionMapping

const material = new THREE.MeshPhysicalMaterial({
    color: 0xb2ffc8,
    envMap: envTexture,
    metalness: 0.5,
    roughness: 0.1,
    transparent: true,
    opacity: 0.75,
    //transmission: .9,
    side: THREE.DoubleSide,
    flatShading: true
})

const cubeMesh = new THREE.Mesh(
    new THREE.BoxGeometry(1, 2, 2),
    new THREE.MeshPhongMaterial({ color: 0xff0000 })
)
cubeMesh.position.set(-2, 1.5, -3)
scene.add(cubeMesh)

let modelsReady = false
let cubeMonkeyMeshIntersect: THREE.Mesh
let cubeMonkeyMeshSubtract: THREE.Mesh
let cubeMonkeyMeshUnion: THREE.Mesh

const loader = new GLTFLoader()
loader.load(
    'models/monkey.glb',
    function (gltf) {
        gltf.scene.traverse(function (child) {
            if ((child as THREE.Mesh).isMesh) {
                if ((child as THREE.Mesh).name === 'Suzanne') {
                    const mesh = new THREE.Mesh(
                        (child as THREE.Mesh).geometry.clone(),
                        new THREE.MeshPhongMaterial({ color: 0x00ff00 })
                    )
                    mesh.position.set(2, 1.5, -3)
                    mesh.geometry.scale(1.15, 1.15, 1.15)
                    scene.add(mesh) //adding only the monkey mesh to the scene and ignoring everything else inside the gltf

                    const cubeCSG = CSG.fromGeometry(
                        cubeMesh.geometry.clone().translate(-0.5, 0, 0)
                    )
                    const monkeyMeshCSG = CSG.fromMesh(mesh)

                    const cubeMonkeyMeshIntersectCSG = cubeCSG.intersect(
                        monkeyMeshCSG.clone()
                    )
                    cubeMonkeyMeshIntersect = CSG.toMesh(
                        cubeMonkeyMeshIntersectCSG,
                        new THREE.Matrix4()
                    )
                    cubeMonkeyMeshIntersect.material = material
                    cubeMonkeyMeshIntersect.position.set(-3, 1.5, 0)
                    scene.add(cubeMonkeyMeshIntersect)

                    const cubeMonkeyMeshSubtractCSG = cubeCSG.subtract(
                        monkeyMeshCSG.clone()
                    )
                    cubeMonkeyMeshSubtract = CSG.toMesh(
                        cubeMonkeyMeshSubtractCSG,
                        new THREE.Matrix4()
                    )
                    cubeMonkeyMeshSubtract.material = material
                    cubeMonkeyMeshSubtract.position.set(0, 1.5, 0)
                    scene.add(cubeMonkeyMeshSubtract)

                    const cubeMonkeyMeshUnionCSG = cubeCSG.union(
                        monkeyMeshCSG.clone()
                    )
                    cubeMonkeyMeshUnion = CSG.toMesh(
                        cubeMonkeyMeshUnionCSG,
                        new THREE.Matrix4()
                    )
                    cubeMonkeyMeshUnion.material = material
                    cubeMonkeyMeshUnion.position.set(3, 1.5, 0)
                    scene.add(cubeMonkeyMeshUnion)

                    modelsReady = true
                }
            }
        })
    },
    (xhr) => {
        console.log((xhr.loaded / xhr.total) * 100 + '% loaded')
    },
    (error) => {
        console.log(error)
    }
)

window.addEventListener('resize', onWindowResize, false)
function onWindowResize() {
    camera.aspect = window.innerWidth / window.innerHeight
    camera.updateProjectionMatrix()
    renderer.setSize(window.innerWidth, window.innerHeight)
}

const stats = Stats()
document.body.appendChild(stats.dom)

function animate() {
    requestAnimationFrame(animate)

    controls.update()

    if (modelsReady) {
        cubeMonkeyMeshIntersect.rotation.y += 0.005
        cubeMonkeyMeshSubtract.rotation.y += 0.005
        cubeMonkeyMeshUnion.rotation.y += 0.005
    }

    render()

    stats.update()
}

function render() {
    renderer.render(scene, camera)
}

animate()