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types-of-constraints.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>All Constraints Types</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>
<div id="info-text">
From Left to Right:<br />Lock, Fixed, PointToPoint, Hinge, Slider, Spring, ConeTwist, 6DOF (Six degrees of
freedom)
</div>
<script>
const { Project, Scene3D, PhysicsLoader, THREE } = ENABLE3D
class MainScene extends Scene3D {
create() {
this.warpSpeed('-ground')
this.camera.position.set(0, 2, 20)
this.camera.lookAt(0, 0, 0)
this.physics.debug.enable()
let i = 2
const changeMode = () => {
let mode = i % 3 === 0 ? 1 + 2048 : i % 3 === 1 ? 1 + 4096 : 1 + 2048 + 4096
this.physics.debug.mode(mode)
i++
}
changeMode()
setInterval(changeMode, 4000)
let mat1 = this.add.material({ lambert: { color: 'yellow', transparent: true, opacity: 0.5 } })
let mat2 = this.add.material({ lambert: { color: 'blue', transparent: true, opacity: 0.5 } })
let mat3 = this.add.material({ lambert: { color: 'green', transparent: true, opacity: 0.5 } })
const lock = x => {
let box1 = this.physics.add.box({ y: 2, x, mass: 0 }, { custom: mat1 })
let box2 = this.physics.add.box({ y: 0.75, x: x + 0.75, z: 0.5 }, { custom: mat2 })
this.physics.add.constraints.lock(box1.body, box2.body)
}
const fixed = x => {
let box1 = this.physics.add.box({ y: 2, x, mass: 0 }, { custom: mat1 })
let box2 = this.physics.add.box({ y: 0.75, x: x + 0.75, z: 0.5 }, { custom: mat2 })
this.physics.add.constraints.fixed(box1.body, box2.body)
box2.body.setVelocityX(10)
}
const pointToPoint = x => {
let box1 = this.physics.add.box({ y: 2, x, mass: 0 }, { custom: mat1 })
let box2 = this.physics.add.box({ y: 2, x, z: 4 }, { custom: mat2 })
this.physics.add.constraints.pointToPoint(box1.body, box2.body, {
// the offset from the center of each object
pivotA: { z: 1.5 },
pivotB: { x: -1.5 }
})
}
const hinge = x => {
let box1 = this.physics.add.box({ depth: 0.25, y: 2, z: 0, x: x, mass: 0 }, { custom: mat1 })
let box2 = this.physics.add.box({ depth: 0.25, y: 2, z: 0.5, x: x + 1.25 }, { custom: mat2 })
let box3 = this.physics.add.box({ depth: 0.25, y: 2, z: 1, x: x + 1.25 }, { custom: mat3 })
this.physics.add.constraints.hinge(box1.body, box2.body, {
pivotA: { y: -0.65 },
pivotB: { y: 0.65 },
axisA: { x: 1 },
axisB: { x: 1 }
})
this.physics.add.constraints.hinge(box2.body, box3.body, {
pivotA: { y: -0.65 },
pivotB: { y: 0.65 },
axisA: { x: 1 },
axisB: { x: 1 }
})
}
const slider = x => {
let box1 = this.physics.add.cylinder(
{ height: 6, y: 2, x: x, radiusTop: 0.6, radiusBottom: 0.6, collisionFlags: 6, mass: 100 },
{ custom: mat1 }
)
let box2 = this.physics.add.cylinder(
{ height: 4, y: 2, x: x, radiusTop: 0.4, radiusBottom: 0.4, collisionFlags: 4, mass: 1 },
{ custom: mat2 }
)
this.physics.add.constraints.slider(box1.body, box2.body, {
frameA: { x: Math.PI / 2, y: 0, z: 0 },
frameB: { x: Math.PI / 2, y: 0, z: 0 },
linearLowerLimit: -5,
linearUpperLimit: 5
})
this.box = box1 // we rotate this box in update()
}
const spring = x => {
let box1 = this.physics.add.box({ y: 2, x: x, z: 0, mass: 0 }, { custom: mat1 })
let box2 = this.physics.add.box({ y: 1, x: x, z: 0, mass: 2 }, { custom: mat2 })
let box3 = this.physics.add.box({ y: 0, x: x, z: 0, mass: 8 }, { custom: mat3 })
const linearLowerLimit = { x: -100, y: -100, z: -100 }
const linearUpperLimit = { x: 100, y: 100, z: 100 }
this.physics.add.constraints.spring(box1.body, box2.body, {
damping: 250,
linearLowerLimit,
linearUpperLimit
})
this.physics.add.constraints.spring(box2.body, box3.body, {
damping: 20,
linearLowerLimit,
linearUpperLimit
})
}
const coneTwist = x => {
let box1 = this.physics.add.box({ y: 2, x: x, collisionFlags: 2, mass: 100 }, { custom: mat1 })
let box2 = this.physics.add.box({ y: 0, x: x, z: 0 }, { custom: mat2 })
this.physics.add.constraints.coneTwist(box1.body, box2.body, {
frameA: { x: 1, y: 1, z: 1 },
frameB: { x: 0.5, y: -0.5, z: 0.5 }
})
}
const dof = x => {
let box1 = this.physics.add.box({ y: 2, x: x, collisionFlags: 2, mass: 100 }, { custom: mat1 })
let box2 = this.physics.add.box({ y: 0, x: x, z: 0 }, { custom: mat2 })
this.physics.add.constraints.dof(box1.body, box2.body, { center: true })
this.box2 = box1 // we rotate this box in update()
}
lock(-14)
fixed(-10)
pointToPoint(-6)
hinge(-2)
slider(2)
spring(6)
coneTwist(10)
dof(14)
}
update() {
this.box.rotation.x += 0.01
this.box.body.needUpdate = true
this.box2.rotation.x += 0.01
this.box2.body.needUpdate = true
}
}
PhysicsLoader('/lib/ammo/kripken', () => new Project({ scenes: [MainScene] }))
</script>
</body>
</html>