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softbody-cloth.html
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softbody-cloth.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta
name="viewport"
content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no, viewport-fit=cover"
/>
<meta http-equiv="X-UA-Compatible" content="ie=edge" />
<title>SoftBody Cloth</title>
<link rel="stylesheet" href="/css/examples.css?ver=1.0.0" />
<script src="/js/examples.js?ver=1.1.1"></script>
<script src="/lib/enable3d/enable3d.framework.0.25.4.min.js"></script>
</head>
<body>
<script>
const { Project, Scene3D, PhysicsLoader, THREE } = ENABLE3D
class MainScene extends Scene3D {
async create() {
const { orbitControls } = await this.warpSpeed()
this.camera.position.set(5, 5, 10)
orbitControls?.target.set(0, 2.5, 0)
this.camera.lookAt(0, 2.5, 0)
// enable physics debugging
this.physics.debug?.enable()
// ball
this.ball = this.physics.add.sphere({ x: 5, y: 2, collisionFlags: 2 })
// bar
const bar = this.add.cylinder({ y: 5, height: 5, radiusTop: 0.1, radiusBottom: 0.1 })
bar.rotateX(Math.PI / 2)
this.physics.add.existing(bar, { collisionFlags: 1, mass: 0 })
// The cloth
// Cloth graphic object
const clothWidth = 4
const clothHeight = 3
const clothNumSegmentsZ = clothWidth * 5
const clothNumSegmentsY = clothHeight * 5
const clothPos = new THREE.Vector3(0, 2, 2)
const clothGeometry = new THREE.PlaneGeometry(clothWidth, clothHeight, clothNumSegmentsZ, clothNumSegmentsY)
clothGeometry.rotateY(Math.PI * 0.5)
clothGeometry.translate(clothPos.x, clothPos.y + clothHeight * 0.5, clothPos.z - clothWidth * 0.5)
const clothMaterial = new THREE.MeshLambertMaterial({ color: 0xffffff, side: THREE.DoubleSide })
this.cloth = new THREE.Mesh(clothGeometry, clothMaterial)
this.cloth.castShadow = true
this.cloth.receiveShadow = true
this.scene.add(this.cloth)
this.load.texture('/assets/img/grid.png').then(texture => {
texture.wrapS = THREE.RepeatWrapping
texture.wrapT = THREE.RepeatWrapping
texture.repeat.set(clothNumSegmentsZ, clothNumSegmentsY)
// @ts-ignore
this.cloth.material.map = texture
// @ts-ignore
this.cloth.material.needsUpdate = true
})
// Cloth physic object
const softBodyHelpers = new Ammo.btSoftBodyHelpers()
const clothCorner00 = new Ammo.btVector3(clothPos.x, clothPos.y + clothHeight, clothPos.z)
const clothCorner01 = new Ammo.btVector3(clothPos.x, clothPos.y + clothHeight, clothPos.z - clothWidth)
const clothCorner10 = new Ammo.btVector3(clothPos.x, clothPos.y, clothPos.z)
const clothCorner11 = new Ammo.btVector3(clothPos.x, clothPos.y, clothPos.z - clothWidth)
const clothSoftBody = softBodyHelpers.CreatePatch(
this.physics.physicsWorld.getWorldInfo(),
clothCorner00,
clothCorner01,
clothCorner10,
clothCorner11,
clothNumSegmentsZ + 1,
clothNumSegmentsY + 1,
0,
true
)
const sbConfig = clothSoftBody.get_m_cfg()
sbConfig.set_viterations(10)
sbConfig.set_piterations(10)
clothSoftBody.setTotalMass(0.9, false)
// @ts-ignore
Ammo.castObject(clothSoftBody, Ammo.btCollisionObject).getCollisionShape().setMargin(0.04)
this.physics.physicsWorld.addSoftBody(clothSoftBody, 1, -1)
this.cloth.userData.physicsBody = clothSoftBody
// Disable deactivation
clothSoftBody.setActivationState(4)
// Glue the cloth to the bar
const influence = 0.5
clothSoftBody.appendAnchor(0, bar.body.ammo, false, influence)
clothSoftBody.appendAnchor(clothNumSegmentsZ, bar.body.ammo, false, influence)
}
update(time) {
// update ball
this.ball.position.x -= Math.sin(time) * 0.1
this.ball.body.needUpdate = true
// update cloth
const softBody = this.cloth.userData.physicsBody
// @ts-ignore
const clothPositions = this.cloth.geometry.attributes.position.array
const numVerts = clothPositions.length / 3
const nodes = softBody.get_m_nodes()
let indexFloat = 0
for (let i = 0; i < numVerts; i++) {
const node = nodes.at(i)
const nodePos = node.get_m_x()
clothPositions[indexFloat++] = nodePos.x()
clothPositions[indexFloat++] = nodePos.y()
clothPositions[indexFloat++] = nodePos.z()
}
this.cloth.geometry.computeVertexNormals()
// @ts-ignore
this.cloth.geometry.attributes.position.needsUpdate = true
// @ts-ignore
this.cloth.geometry.attributes.normal.needsUpdate = true
}
}
PhysicsLoader('/lib/ammo/kripken', () => new Project({ scenes: [MainScene], softBodies: true }))
</script>
</body>
</html>