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slope-angle-and-moving-platform.html
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slope-angle-and-moving-platform.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>Slope Angle and Moving Platform</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">Use your Arrow Keys to move</div>
<script>
const { Project, Scene3D, PhysicsLoader } = ENABLE3D
class MainScene extends Scene3D {
player
platform
raycaster
jump = false
canJump = true
isMovingRight = false
isMovingLeft = false
async create() {
this.warpSpeed('-orbitControls')
this.camera.position.set(0, 10, 20)
this.camera.lookAt(0, 0, 0)
// this.physics.debug?.enable()
this.raycaster = this.physics.add.raycaster('closest')
this.player = this.physics.add.sphere({ y: 5, x: 4, radius: 1 })
this.player.body.setAngularFactor(0, 1, 0)
this.player.body.setFriction(0)
const slopeRight = this.add.box({ width: 10, depth: 10 })
slopeRight.name = 'slopeRight'
slopeRight.position.set(2, 1, 0)
slopeRight.rotateZ(Math.PI / 8)
this.physics.add.existing(slopeRight, { mass: 0, collisionFlags: 1 })
slopeRight.body.setFriction(0)
const slopeLeft = this.add.box({ width: 10, depth: 10 })
slopeLeft.name = 'slopeLeft'
slopeLeft.position.set(-8, 1, 0)
slopeLeft.rotateZ(-Math.PI / 4)
this.physics.add.existing(slopeLeft, { mass: 0, collisionFlags: 1 })
slopeLeft.body.setFriction(0)
this.platform = this.add.box({ width: 10, depth: 10 })
this.platform.name = 'platform'
this.platform.position.set(12, 3, 0)
this.physics.add.existing(this.platform, { mass: 10, collisionFlags: 2 })
document.addEventListener('keydown', e => {
switch (e.keyCode) {
case 32: // space
this.jump = true
break
case 38: // up
this.jump = true
break
case 37: // left
this.isMovingLeft = true
break
case 39: // right
this.isMovingRight = true
break
}
})
document.addEventListener('keyup', e => {
switch (e.keyCode) {
case 37: // left
this.isMovingLeft = false
break
case 39: // right
this.isMovingRight = false
break
}
})
}
update(time, delta) {
const { x, y, z } = this.player.position
if (y < -20) {
this.restart()
return
}
this.platform.position.x = (Math.sin(time) + 1) * 5 + 12
this.platform.body.needUpdate = true
this.camera.lookAt(x, y, z)
let tooSteep = false
let addVelocity = 0
let offset = 0
const rayLength = 1.25
if (this.isMovingLeft) offset = -rayLength / 2
else if (this.isMovingRight) offset = rayLength / 2
this.raycaster.setRayFromWorld(x, y, z)
this.raycaster.setRayToWorld(x + offset, y - rayLength, z)
this.raycaster.rayTest()
if (this.raycaster.hasHit()) {
const hnw = this.raycaster.getHitNormalWorld()
const co = this.raycaster.getCollisionObject()
// adjust the velocity of the player while on the moving platform
if (co.name === 'platform') addVelocity = co.body.velocity.x
// normal to slope in deg
const slopeInDeg = Math.abs((Math.atan2(hnw.y, hnw.x) * 180) / Math.PI - 90)
if (slopeInDeg >= 5 && slopeInDeg < 30 && this.canJump && !this.isMovingRight && !this.isMovingLeft) {
this.player.body.setVelocity(0, 0, 0)
this.player.body.setGravity(0, 0, 0)
}
if (slopeInDeg >= 30) {
tooSteep = true
}
}
if (!tooSteep) {
if (this.isMovingLeft) this.player.body.setVelocityX(-5)
else if (this.isMovingRight) this.player.body.setVelocityX(5)
else this.player.body.setVelocityX(0)
}
if (addVelocity !== 0) {
const vx = this.player.body.velocity.x
this.player.body.setVelocityX(vx + addVelocity)
}
addVelocity = 0
if (this.isMovingRight || this.isMovingLeft) {
this.player.body.setGravity(0, -9.81 * 2, 0)
}
if (this.jump && this.canJump) {
this.player.body.setGravity(0, -9.81 * 2, 0)
this.player.body.applyForceY(12)
this.jump = false
this.canJump = false
setTimeout(() => {
this.canJump = true
}, 250)
}
}
}
PhysicsLoader(
'/lib/ammo/kripken',
() => new Project({ gravity: { x: 0, y: -9.81 * 2, z: 0 }, scenes: [MainScene] })
)
</script>
</body>
</html>