A Pen by Toshiya Marukubo on CodePen.
Created
June 1, 2022 15:23
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#016 | Tender
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// Reference | |
// https://towardsdatascience.com/fun-with-html-canvas-lets-make-lava-lamp-plasma-e4b0d89fe778 | |
// https://www.youtube.com/watch?v=8K5wJeVgjrM&t=615s | |
// Thank you so much. | |
// sphere vertex shader source | |
const vertexSphereShader = ` | |
uniform float uTime; | |
uniform float mouse; | |
varying vec2 vUv; | |
float PI = 3.14159265359; | |
// Reference | |
// https://gist.github.com/patriciogonzalezvivo/670c22f3966e662d2f83 | |
// Thank you so much. | |
float mod289(float x){return x - floor(x * (1.0 / 289.0)) * 289.0;} | |
vec4 mod289(vec4 x){return x - floor(x * (1.0 / 289.0)) * 289.0;} | |
vec4 perm(vec4 x){return mod289(((x * 34.0) + 1.0) * x);} | |
float noise(vec3 p){ | |
vec3 a = floor(p); | |
vec3 d = p - a; | |
d = d * d * (3.0 - 2.0 * d); | |
vec4 b = a.xxyy + vec4(0.0, 1.0, 0.0, 1.0); | |
vec4 k1 = perm(b.xyxy); | |
vec4 k2 = perm(k1.xyxy + b.zzww); | |
vec4 c = k2 + a.zzzz; | |
vec4 k3 = perm(c); | |
vec4 k4 = perm(c + 1.0); | |
vec4 o1 = fract(k3 * (1.0 / 41.0)); | |
vec4 o2 = fract(k4 * (1.0 / 41.0)); | |
vec4 o3 = o2 * d.z + o1 * (1.0 - d.z); | |
vec2 o4 = o3.yw * d.x + o3.xz * (1.0 - d.x); | |
return o4.y * d.y + o4.x * (1.0 - d.y); | |
} | |
void main(){ | |
float noisy = mouse * pow(noise(normal * 2.0 + uTime * 10.0), 2.0); | |
vec3 newPosition = position + noisy * normal * 100.0; | |
vec4 mvPosition = modelViewMatrix * vec4(newPosition, 1.0); | |
vUv = uv; | |
gl_Position = projectionMatrix * mvPosition; | |
} | |
`; | |
// sphere fragment shader source | |
const fragmentSphereShader = ` | |
uniform float uTime; | |
uniform sampler2D uTexture; | |
varying vec2 vUv; | |
void main () { | |
vec4 color = texture2D(uTexture, vUv); | |
gl_FragColor = vec4(color / 3.0); | |
} | |
`; | |
// sphere vertex shader source | |
const vertexFloorShader = ` | |
uniform float uTime; | |
uniform float mouse; | |
varying vec2 vUv; | |
float PI = 3.14159265359; | |
// Reference | |
// https://gist.github.com/patriciogonzalezvivo/670c22f3966e662d2f83 | |
// Thank you so much. | |
float mod289(float x){return x - floor(x * (1.0 / 289.0)) * 289.0;} | |
vec4 mod289(vec4 x){return x - floor(x * (1.0 / 289.0)) * 289.0;} | |
vec4 perm(vec4 x){return mod289(((x * 34.0) + 1.0) * x);} | |
float noise(vec3 p){ | |
vec3 a = floor(p); | |
vec3 d = p - a; | |
d = d * d * (3.0 - 2.0 * d); | |
vec4 b = a.xxyy + vec4(0.0, 1.0, 0.0, 1.0); | |
vec4 k1 = perm(b.xyxy); | |
vec4 k2 = perm(k1.xyxy + b.zzww); | |
vec4 c = k2 + a.zzzz; | |
vec4 k3 = perm(c); | |
vec4 k4 = perm(c + 1.0); | |
vec4 o1 = fract(k3 * (1.0 / 41.0)); | |
vec4 o2 = fract(k4 * (1.0 / 41.0)); | |
vec4 o3 = o2 * d.z + o1 * (1.0 - d.z); | |
vec2 o4 = o3.yw * d.x + o3.xz * (1.0 - d.x); | |
return o4.y * d.y + o4.x * (1.0 - d.y); | |
} | |
void main(){ | |
float noisy = mouse * pow(noise(normal + position.y * position.x + uTime * 10.0), 2.0); | |
vec3 newPosition = position + noisy * 2.0 * normal * 300.0; | |
vec4 mvPosition = modelViewMatrix * vec4(newPosition, 1.0); | |
vUv = uv; | |
gl_Position = projectionMatrix * mvPosition; | |
} | |
`; | |
// sphere fragment shader source | |
const fragmentFloorShader = ` | |
uniform float uTime; | |
uniform sampler2D uTexture; | |
varying vec2 vUv; | |
void main () { | |
vec4 color = texture2D(uTexture, vUv); | |
gl_FragColor = vec4(color / 3.0); | |
} | |
`; | |
/** | |
* Mouse class | |
*/ | |
class Mouse { | |
constructor(sketch) { | |
this.sketch = sketch; | |
this.initialize(); | |
} | |
initialize() { | |
this.delta = 0; | |
this.mouse = new THREE.Vector3(); | |
this.setupEvents(); | |
this.lastX = 0; | |
this.lastY = 0; | |
this.speed = 0; | |
} | |
setupEvents() { | |
window.addEventListener('scroll', this.onScroll.bind(this), false); | |
window.addEventListener('mousemove', this.onMousemove.bind(this), false); | |
window.addEventListener('touchmove', this.onTouchmove.bind(this), false); | |
} | |
onScroll(e) { | |
const docScrollTop = window.pageYOffset; | |
const docHeight = document.body.scrollHeight - window.innerHeight; | |
const scrollPercent = docScrollTop / docHeight; | |
this.delta = scrollPercent; | |
} | |
onMousemove(e) { | |
this.mouse.x = (e.clientX / window.innerWidth) * 2 - 1; | |
this.mouse.y = -(e.clientY / window.innerHeight) * 2 + 1; | |
this.mouse.z = 0; | |
this.speed = | |
Math.sqrt((e.pageX - this.lastX) **2 + | |
(e.pageY - this.lastY) **2) * 0.1; | |
this.lastX = e.pageX; | |
this.lastY = e.pageY; | |
} | |
onTouchmove(e) { | |
const touch = e.targetTouches[0]; | |
this.mouse.x = (touch.pageX / window.innerWidth) * 2 - 1; | |
this.mouse.y = -(touch.pageY / window.innerHeight) * 2 + 1; | |
this.mouse.z = 0; | |
this.speed = | |
Math.sqrt((touch.pageX - this.lastX) **2 + | |
(touch.pageY - this.lastY) **2) * 0.5; | |
this.lastX = touch.pageX; | |
this.lastY = touch.pageY; | |
} | |
} | |
/** | |
* class Sketch | |
*/ | |
class Sketch { | |
constructor() { | |
this.createCanvas(); | |
this.setupEvents(); | |
this.time = new THREE.Clock(true); | |
this.mouse = new Mouse(this); | |
this.initialize(); | |
} | |
createCanvas() { | |
this.renderer = | |
new THREE.WebGLRenderer({ | |
antialias: true, | |
alpha: true | |
}); | |
document.body.appendChild(this.renderer.domElement); | |
} | |
setupEvents() { | |
window.addEventListener('resize', this.onResize.bind(this), false); | |
} | |
onResize() { | |
if (this.preWidth === window.innerWidth && window.innerWidth < 480) { | |
return; | |
} | |
this.initialize(); | |
} | |
initialize() { | |
if (this.animationId) { | |
cancelAnimationFrame(this.animationId); | |
} | |
this.preWidth = this.width = Math.ceil(window.innerWidth); | |
this.height = Math.ceil(window.innerHeight); | |
this.scene = new THREE.Scene(); | |
this.setupCanvas(); | |
this.setupCamera(); | |
this.setupLight(); | |
this.setupShape(); | |
this.draw(); | |
} | |
setupCanvas() { | |
this.renderer.setSize(this.width, this.height); | |
this.renderer.setPixelRatio(window.devicePixelRatio); | |
this.renderer.setClearColor('#D7D6DA', 1.0); | |
this.renderer.domElement.style.position = 'fixed'; | |
this.renderer.domElement.style.top = '0'; | |
this.renderer.domElement.style.left = '0'; | |
this.renderer.domElement.style.width = '100%'; | |
this.renderer.domElement.style.height = '100%'; | |
this.renderer.domElement.style.zIndex = '-1'; | |
this.renderer.domElement.style.outline = 'none'; | |
} | |
setupCamera() { | |
const fov = 50; | |
const fovRadian = (fov / 2) * (Math.PI / 180); | |
this.dist = this.height / 2 / Math.tan(fovRadian); | |
this.camera = | |
new THREE.PerspectiveCamera( | |
fov, | |
this.width / this.height, | |
0.01, | |
this.dist * 10 | |
); | |
this.cameraV = new THREE.Vector3(); | |
this.cameraP = new THREE.Vector3(0, 0, this.dist); | |
this.camera.position.set(this.cameraP.x, this.cameraP.y, this.cameraP.z); | |
this.camera.lookAt(new THREE.Vector3()); | |
this.scene.add(this.camera); | |
} | |
updateCamera(time) { | |
this.cameraV.subVectors(this.mouse.mouse, this.cameraP).multiplyScalar(0.05); | |
this.cameraP.add(this.cameraV); | |
this.camera.position.set( | |
this.cameraP.x * this.dist, | |
Math.max(this.cameraP.y * this.dist, -200), | |
this.dist | |
); | |
this.camera.lookAt(new THREE.Vector3()); | |
} | |
setupLight() { | |
// directinal light | |
this.directionalLight = new THREE.DirectionalLight(0xffffff); | |
this.scene.add(this.directionalLight); | |
// point light | |
this.spotLight = new THREE.SpotLight(0xffffff); | |
this.spotLightV = new THREE.Vector3(); | |
this.spotLightP = new THREE.Vector3(0, 0, this.dist * 0.1); | |
this.spotLight.position.set(this.spotLightP.x, this.spotLightP.y, this.spotLightP.z); | |
this.spotLight.lookAt(new THREE.Vector3()); | |
this.scene.add(this.spotLight); | |
} | |
updateLight() { | |
this.spotLightV.subVectors(this.mouse.mouse, this.spotLightP).multiplyScalar(0.05); | |
this.spotLightP.add(this.spotLightV); | |
this.spotLight.position.set( | |
this.spotLightP.x * this.dist, | |
this.spotLightP.y * this.dist, | |
this.dist | |
); | |
this.spotLight.lookAt(new THREE.Vector3()); | |
} | |
setupShape() { | |
this.shape = new Shape(this, 0, 0, 0); | |
} | |
draw() { | |
const time = this.time.getElapsedTime(); | |
this.shape.render(time * 0.1); | |
this.updateCamera(time); | |
this.updateLight(time); | |
this.renderer.render(this.scene, this.camera); | |
this.animationId = requestAnimationFrame(this.draw.bind(this)); | |
} | |
} | |
/** | |
* shape class | |
*/ | |
class Shape { | |
constructor(sketch, x, y, z) { | |
this.sketch = sketch; | |
this.beta = 0; | |
this.position = new THREE.Vector3(x, y, z); | |
this.setupSizes(); | |
this.initialize(); | |
} | |
setupSizes() { | |
this.sphereSize = null; | |
this.floorSize = Math.max(this.sketch.width * 5, this.sketch.height * 5); | |
if (this.sketch.width < 768) { | |
this.sphereSize = 120; | |
} | |
if (this.sketch.width >= 768) { | |
this.sphereSize = 192; | |
} | |
} | |
initialize() { | |
this.createTexture(); | |
//floor | |
this.floorGeometry = new THREE.PlaneGeometry(this.floorSize, this.floorSize, 128, 128); | |
this.floorMaterial = new THREE.ShaderMaterial({ | |
side: THREE.DoubleSide, | |
uniforms: { | |
uTime: {type: 'f', value: 0}, | |
mouse: {type: 'f', value: 0}, | |
uTexture: {type: 't', value: this.returnTexture()} | |
}, | |
vertexShader: vertexFloorShader, | |
fragmentShader: fragmentFloorShader | |
}); | |
this.floorMesh = new THREE.Mesh(this.floorGeometry, this.floorMaterial); | |
this.floorMesh.position.set(0, -this.sketch.height / 3, 0); | |
this.floorMesh.rotation.x = Math.PI / 2; | |
this.sketch.scene.add(this.floorMesh); | |
// sphere | |
this.sphereGeometry = new THREE.SphereGeometry(this.sphereSize, 64, 64); | |
this.sphereMaterial = new THREE.ShaderMaterial({ | |
side: THREE.DoubleSide, | |
uniforms: { | |
uTime: {type: 'f', value: 0}, | |
mouse: {type: 'f', value: 0}, | |
uTexture: {type: 't', value: this.returnTexture()} | |
}, | |
vertexShader: vertexSphereShader, | |
fragmentShader: fragmentSphereShader | |
}); | |
this.sphereMeshV = new THREE.Vector3(); | |
this.sphereMeshP = new THREE.Vector3(0, -2000, 0); | |
this.sphereMesh = new THREE.Mesh(this.sphereGeometry, this.sphereMaterial); | |
this.sphereMesh.position.set(this.sphereMeshP.x, this.sphereMeshP.y, this.sphereMeshP.z); | |
this.sphereMesh.rotation.y = -Math.PI / 2; | |
this.sketch.scene.add(this.sphereMesh); | |
} | |
createTexture() { | |
this.canvas = document.createElement('canvas'); | |
this.ctx = this.canvas.getContext('2d'); | |
this.length = 256; | |
this.canvas.width = this.length; | |
this.canvas.height = this.length; | |
this.plasma = new Plasma(this.ctx, this.length, this.length); | |
this.texture = new THREE.CanvasTexture(this.canvas); | |
} | |
returnTexture() { | |
return this.texture; | |
} | |
updateTexture(time) { | |
this.plasma.render(time * 10); | |
} | |
render(time) { | |
this.sphereMeshV.subVectors(new THREE.Vector3(), this.sphereMeshP).multiplyScalar(0.05); | |
this.sphereMeshP.add(this.sphereMeshV); | |
this.sphereMesh.position.set(this.sphereMeshP.x, this.sphereMeshP.y, this.sphereMeshP.z); | |
this.beta -= (this.beta - this.sketch.mouse.speed) * 0.05; | |
this.sketch.mouse.speed *= 0.99; | |
this.texture.needsUpdate = true; // important | |
this.updateTexture(time); | |
this.sphereMesh.material.uniforms.uTime.value = time; | |
this.sphereMesh.material.uniforms.mouse.value = this.beta; | |
this.floorMesh.material.uniforms.uTime.value = time; | |
this.floorMesh.material.uniforms.mouse.value = this.beta; | |
} | |
} | |
// Reference | |
// https://towardsdatascience.com/fun-with-html-canvas-lets-make-lava-lamp-plasma-e4b0d89fe778 | |
// Thank you so much. | |
class Plasma { | |
constructor(ctx, s) { | |
this.ctx = ctx; | |
this.size = s; | |
this.mapSize = this.size * 2; | |
this.initialize(); | |
} | |
initialize() { | |
this.prevDirection = 1; | |
this.dx1 = 0; | |
this.dy1 = 0; | |
this.dx2 = 0; | |
this.dy2 = 0; | |
this.heightMap1 = []; | |
this.heightMap2 = []; | |
this.palette = []; | |
this.palettes = [this.makeRandomPalette(), this.makeRandomPalette()]; | |
this.image = this.ctx.createImageData(this.size, this.size); | |
this.getImageData(); | |
this.getHeightMap(); | |
} | |
getImageData() { | |
for (let i = 0; i < this.image.data.length; i += 4) { | |
this.image.data[i + 0] = 0; | |
this.image.data[i + 1] = 0; | |
this.image.data[i + 2] = 0; | |
this.image.data[i + 3] = 255; | |
} | |
} | |
distance(x, y) { | |
return Math.sqrt(x * x + y * y); | |
} | |
randomColor() { | |
const r = Math.floor(Math.random() * 255); | |
const g = Math.floor(Math.random() * 255); | |
const b = Math.floor(Math.random() * 255); | |
return {r, g, b} | |
} | |
updatePalette(time) { | |
const inter = (Math.cos(time) + 1) / 2; | |
const direction = Math.sin(time) >= 0 ? -1 : 1; | |
if (this.prevDirection != direction) { | |
this.prevDirection = direction; | |
if (direction == -1) { | |
this.palettes[0] = this.makeRandomPalette(); | |
} else { | |
this.palettes[1] = this.makeRandomPalette(); | |
} | |
} | |
for (let i = 0; i < 256; i++) { | |
this.palette[i] = this.interpolate(this.palettes[0][i], this.palettes[1][i], inter); | |
} | |
} | |
makeRandomPalette() { | |
const c1 = this.randomColor(); | |
const c2 = this.randomColor(); | |
const c3 = this.randomColor(); | |
const c4 = this.randomColor(); | |
const c5 = this.randomColor(); | |
return this.makeFiveColorGradient(c1, c2, c3, c4, c5); | |
} | |
interpolate(c1, c2, f) { | |
return { | |
r: Math.floor(c1.r + (c2.r - c1.r) * f), | |
g: Math.floor(c1.g + (c2.g - c1.g) * f), | |
b: Math.floor(c1.b + (c2.b - c1.b) * f) | |
}; | |
} | |
makeFiveColorGradient(c1, c2, c3, c4, c5) { | |
const g = []; | |
for (let i = 0; i < 64; i++) { | |
const f = i / 64; | |
g[i] = this.interpolate(c1, c2, f); | |
} | |
for (let i = 64; i < 128; i++) { | |
const f = (i - 64) / 64; | |
g[i] = this.interpolate(c2, c3, f); | |
} | |
for (let i = 128; i < 192; i++) { | |
const f = (i - 128) / 64; | |
g[i] = this.interpolate(c3, c4, f); | |
} | |
for (let i = 192; i < 256; i++) { | |
const f = (i - 192) / 64; | |
g[i] = this.interpolate(c4, c5, f); | |
} | |
return g; | |
} | |
getHeightMap() { | |
for (let x = 0; x < this.mapSize; x++) { | |
for (let y = 0; y < this.mapSize; y++) { | |
const i = x * this.mapSize + y; | |
const cx = x - this.mapSize / 2; | |
const cy = y - this.mapSize / 2; | |
const d = this.distance(cx, cy); | |
const s = (Math.PI * 2) / (this.mapSize / 2); | |
const r = Math.sin(d * s); | |
const n = (r + 1) / 2; | |
this.heightMap1[i] = Math.floor(n * 128); | |
} | |
} | |
for (let x = 0; x < this.mapSize; x++) { | |
for (let y = 0; y < this.mapSize; y++) { | |
const i = x * this.mapSize + y; | |
const cx = x - this.mapSize / 2; | |
const cy = y - this.mapSize / 2; | |
const d1 = this.distance(cx, cy) * 0.1; | |
const d2 = this.distance(cx, cy) * 0.02; | |
const s = Math.sin(d1); | |
const c = Math.cos(d2); | |
const h = s + c; | |
const n = (h + 2) / 4; | |
this.heightMap2[i] = Math.floor(n * 127); | |
} | |
} | |
} | |
moveHeightMap(time) { | |
this.dx1 = Math.floor( | |
(((Math.cos(time * 0.5) + 1) / 2) * this.mapSize) / 2 | |
); | |
this.dy1 = Math.floor( | |
(((Math.sin(time * 0.2) + 1) / 2) * this.mapSize) / 2 | |
); | |
this.dx2 = Math.floor( | |
(((Math.cos(time * 0.3) + 1) / 2) * this.mapSize) / 2 | |
); | |
this.dy2 = Math.floor( | |
(((Math.sin(time * 0.4) + 1) / 2) * this.mapSize) / 2 | |
); | |
} | |
updateImageData() { | |
for (let x = 0; x < this.size; x++) { | |
for (let y = 0; y < this.size; y++) { | |
const i = (x + this.dy1) * this.mapSize + (y + this.dx1); | |
const k = (x + this.dy2) * this.mapSize + (y + this.dx2); | |
const j = x * this.size * 4 + y * 4; | |
const h = this.heightMap1[i] + this.heightMap2[k]; | |
const c = this.palette[h]; | |
this.image.data[j] = c.r; | |
this.image.data[j + 1] = c.g; | |
this.image.data[j + 2] = c.b; | |
} | |
} | |
} | |
drawImageData() { | |
this.ctx.putImageData(this.image, 0, 0); | |
} | |
render(time) { | |
this.ctx.clearRect(0, 0, this.size, this.size); | |
this.moveHeightMap(time); | |
this.updatePalette(time * 2); | |
this.updateImageData(); | |
this.drawImageData(); | |
} | |
} | |
(() => { | |
window.addEventListener('load', () => { | |
new Sketch(); | |
}); | |
})(); |
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