使用WebGL着色器和noise算法实现的浓雾云彩喷薄动画特效

Learning Shaders with example: noise effects，可用来模拟黄山云海奇景。

webgl, three.js, fog, shader

《three.js如何实现贴图模糊效果 - 使用canvas》申请公开！

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HTML
CSS
JavaScript
Result

编译

JavaScript

"use strict";

var canvas = undefined,
    scene = undefined,
    camera = undefined,
    renderer = undefined,
    material = undefined,
    mesh = undefined,
    mouse = undefined,
    targetMouse = undefined,
    mouseOver = false,
    resolution = undefined,
    tick = undefined;

function init() {
    tick = Math.round(Math.random() * 5000);
    mouse = [0, 0];
    targetMouse = [0.5, 0.5];
    resolution = [window.innerWidth, window.innerHeight];
    canvas = document.getElementById("canvas");
    scene = new THREE.Scene();
    camera = new THREE.PerspectiveCamera(50, window.innerWidth / window.innerHeight, 0.1, 5000);
    camera.position.z = 1;

var uniforms = {
        time: {
            type: "f",
            value: 0.0
        },

resolution: {
            type: "v2",
            value: new THREE.Vector2(window.innerWidth, window.innerHeight)
        },

mouse: {
            type: "v2",
            value: new THREE.Vector2(0, 0)
        }
    };

material = new THREE.ShaderMaterial({
        uniforms: uniforms,
        vertexShader: document.getElementById("vert-shader").textContent,
        fragmentShader: document.getElementById("frag-shader").textContent
    });

mesh = new THREE.Mesh(new THREE.PlaneBufferGeometry(2, 2), material);
    scene.add(mesh);
    renderer = new THREE.WebGLRenderer({
        canvas: canvas
    });

resize();
    window.addEventListener("resize", resize);
    canvas.addEventListener("mousemove", mouseHandler);
    canvas.addEventListener("mouseleave", mouseHandler);
}

function render() {
    tick++;

material.uniforms['time'].value = 0.0015 * tick;

lerpArrays(mouse, targetMouse, 0.015);

material.uniforms['mouse'].value.x = mouse[0];
    material.uniforms['mouse'].value.y = mouse[1];
    renderer.render(scene, camera);
    window.requestAnimationFrame(render);
}

function lerpArrays(from, to, amount) {
    from[0] = (1 - amount) * from[0] + amount * to[0];
    from[1] = (1 - amount) * from[1] + amount * to[1];
}

function distance(from, to) {
    return Math.sqrt(Math.pow(to[0] - from[0], 2) + Math.pow(to[1] - from[1], 2));
}

function angle(from, to) {
    return Math.atan(from[1] - to[1], from[0] - to[0]);
}

function resize() {
    material.uniforms["resolution"].value.x = resolution[0] = window.innerWidth;
    material.uniforms["resolution"].value.y = resolution[1] = window.innerHeight;
    camera.aspect = 0.5;
    camera.updateProjectionMatrix();

renderer.setSize(window.innerWidth, window.innerHeight);
    // TODO: Update to handle retina display
    renderer.setPixelRatio(window.devicePixelRatio);
}

window.addEventListener("load", function() {
    init();
    render();
});

编译

CSS

HTML

uniform float time;
	uniform vec2 mouse;
	uniform vec2 resolution;

void main() 
	{
		gl_Position = vec4(position, 1.0);
	}

</script>

//
	// GLSL textureless classic 3D noise "cnoise",
	// with an RSL-style periodic variant "pnoise".
	// Author:  Stefan Gustavson (stefan.gustavson@liu.se)
	// Version: 2011-10-11
	//
	// Many thanks to Ian McEwan of Ashima Arts for the
	// ideas for permutation and gradient selection.
	//
	// Copyright (c) 2011 Stefan Gustavson. All rights reserved.
	// Distributed under the MIT license. See LICENSE file.
	// https://github.com/stegu/webgl-noise
	//

vec3 mod289(vec3 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 permute(vec4 x)
	{
		return mod289(((x*34.0)+1.0)*x);
	}

vec4 taylorInvSqrt(vec4 r)
	{
		return 1.79284291400159 - 0.85373472095314 * r;
	}

vec3 fade(vec3 t) {
		return t*t*t*(t*(t*6.0-15.0)+10.0);
	}

// Classic Perlin noise
	float cnoise(vec3 P)
	{
		vec3 Pi0 = floor(P); // Integer part for indexing
		vec3 Pi1 = Pi0 + vec3(1.0); // Integer part + 1
		Pi0 = mod289(Pi0);
		Pi1 = mod289(Pi1);
		vec3 Pf0 = fract(P); // Fractional part for interpolation
		vec3 Pf1 = Pf0 - vec3(1.0); // Fractional part - 1.0
		vec4 ix = vec4(Pi0.x, Pi1.x, Pi0.x, Pi1.x);
		vec4 iy = vec4(Pi0.yy, Pi1.yy);
		vec4 iz0 = Pi0.zzzz;
		vec4 iz1 = Pi1.zzzz;

vec4 ixy = permute(permute(ix) + iy);
		vec4 ixy0 = permute(ixy + iz0);
		vec4 ixy1 = permute(ixy + iz1);

vec4 gx0 = ixy0 * (1.0 / 7.0);
		vec4 gy0 = fract(floor(gx0) * (1.0 / 7.0)) - 0.5;
		gx0 = fract(gx0);
		vec4 gz0 = vec4(0.5) - abs(gx0) - abs(gy0);
		vec4 sz0 = step(gz0, vec4(0.0));
		gx0 -= sz0 * (step(0.0, gx0) - 0.5);
		gy0 -= sz0 * (step(0.0, gy0) - 0.5);

vec4 gx1 = ixy1 * (1.0 / 7.0);
		vec4 gy1 = fract(floor(gx1) * (1.0 / 7.0)) - 0.5;
		gx1 = fract(gx1);
		vec4 gz1 = vec4(0.5) - abs(gx1) - abs(gy1);
		vec4 sz1 = step(gz1, vec4(0.0));
		gx1 -= sz1 * (step(0.0, gx1) - 0.5);
		gy1 -= sz1 * (step(0.0, gy1) - 0.5);

vec3 g000 = vec3(gx0.x,gy0.x,gz0.x);
		vec3 g100 = vec3(gx0.y,gy0.y,gz0.y);
		vec3 g010 = vec3(gx0.z,gy0.z,gz0.z);
		vec3 g110 = vec3(gx0.w,gy0.w,gz0.w);
		vec3 g001 = vec3(gx1.x,gy1.x,gz1.x);
		vec3 g101 = vec3(gx1.y,gy1.y,gz1.y);
		vec3 g011 = vec3(gx1.z,gy1.z,gz1.z);
		vec3 g111 = vec3(gx1.w,gy1.w,gz1.w);

vec4 norm0 = taylorInvSqrt(vec4(dot(g000, g000), dot(g010, g010), dot(g100, g100), dot(g110, g110)));
		g000 *= norm0.x;
		g010 *= norm0.y;
		g100 *= norm0.z;
		g110 *= norm0.w;
		vec4 norm1 = taylorInvSqrt(vec4(dot(g001, g001), dot(g011, g011), dot(g101, g101), dot(g111, g111)));
		g001 *= norm1.x;
		g011 *= norm1.y;
		g101 *= norm1.z;
		g111 *= norm1.w;

float n000 = dot(g000, Pf0);
		float n100 = dot(g100, vec3(Pf1.x, Pf0.yz));
		float n010 = dot(g010, vec3(Pf0.x, Pf1.y, Pf0.z));
		float n110 = dot(g110, vec3(Pf1.xy, Pf0.z));
		float n001 = dot(g001, vec3(Pf0.xy, Pf1.z));
		float n101 = dot(g101, vec3(Pf1.x, Pf0.y, Pf1.z));
		float n011 = dot(g011, vec3(Pf0.x, Pf1.yz));
		float n111 = dot(g111, Pf1);

vec3 fade_xyz = fade(Pf0);
		vec4 n_z = mix(vec4(n000, n100, n010, n110), vec4(n001, n101, n011, n111), fade_xyz.z);
		vec2 n_yz = mix(n_z.xy, n_z.zw, fade_xyz.y);
		float n_xyz = mix(n_yz.x, n_yz.y, fade_xyz.x); 
		return 2.2 * n_xyz;
	}

uniform float time;
	uniform vec2 mouse;
	uniform vec2 resolution;

void main() 
	{
		vec2 pos, res;
		float mDist, n, r, g, b;
		
		res = gl_FragCoord.xy / 512.0;
		pos = gl_FragCoord.xy / resolution.xy;

mDist = 1.0 - distance(pos, mouse);

n = abs(cnoise(vec3(res, time))) * mDist;

for (float i = 1.0; i <= 4.0; i++) {
			float p = pow(i, 2.0);
			n += abs(cnoise(p * (n + vec3(res, n + time))) / p) * mDist;
		}

r = abs(sin(n)) * mDist;
		b = 0.2 * r;
		g = mix(b, r, mDist);

gl_FragColor = vec4(vec3(r, g, b).rgb, 1.0);
	}

</script>

Learning Shaders with example: noise effects，可用来模拟黄山云海奇景。

webgl, three.js, fog, shader

编辑器支持Emmet

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Learning Shaders with example: noise effects，可用来模拟黄山云海奇景。

webgl, three.js, fog, shader

使用HTML5 WebGL GLSL着色器代码实现的太空星云图粒子动画特效

WebGL Three.js使用噪音算法实现的3D空间乱流动画特效

编辑器支持Emmet

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