火焰

下载代码

html

css

分享到微信朋友圈

html

#define PI 3.14159265359
  #define TAU 6.283185307179586
  
  
  float tri( float x ) { 
    return abs( fract(x) - .5 );
  }

vec3 tri3( vec3 p ){

return vec3( 
        tri( p.z + tri( p.y * 1. ) ), 
        tri( p.z + tri( p.x * 1. ) ), 
        tri( p.y + tri( p.x * 1. ) )
    );

}
  float triNoise3D( vec3 p, float spd , float time){

float z  = 1.4;
    float rz =  0.;
    vec3  bp =   p;

for( float i = 0.; i <= 3.; i++ ){

vec3 dg = tri3( bp * 2. );
      p += ( dg + time * .1 * spd );

bp *= 1.8;
      z  *= 1.5;
      p  *= 1.2;

float t = tri( p.z + tri( p.x + tri( p.y )));
      rz += t / z;
      bp += 0.14;

}

return rz;

}

void main() {
    
    float scale = .4;
    vec2 uv = (gl_FragCoord.xy - 0.5 * u_resolution.xy) / min(u_resolution.y, u_resolution.x);
        
    vec3 highlightColour;
    vec3 bodyColour;
    vec3 bgColour = mix(vec3(0., .0, .1), vec3(.6,.45,.1) * .5, uv.y + .1);
    bgColour += (1. - length(uv * 1.5)) * .2;
    
    vec2 pos = uv / .5;
    float bottom = 0.5*(pos.y+1.0) * sin(u_time);
    vec2 wave = vec2(0.);
    wave.x += bottom*sin(4.0*pos.y-8.0*u_time)*.5;
    
    pos += .25*wave;
    pos.x += pos.x / (1.0-(pos.y));
    
    float flameMask = clamp(1.0-length(pos), 0.0, 1.0);
    flameMask = 1.0-pow(1.0-flameMask, 4.);
    
    bodyColour = mix(vec3(0.5,0.2,0.2), vec3(0.55,0.25,0.0), uv.y + flameMask);
    highlightColour = mix(vec3(1.0,.5,0.0), vec3(1.0,2.0,0.0), uv.y * (1. - flameMask * flameMask));
    
    vec3 uv3d = scale*0.1*vec3(uv.x, uv.y, 0.0);
    uv3d += vec3(0.0, -u_time*0.04, u_time*0.02); // Time component
    float noise = triNoise3D(uv3d * 5. + flameMask * .05, 0., u_time);
    noise = noise * 1.5 - .2;
    
    vec3 colour;
    
    float value = flameMask*noise;    
    value += .5*flameMask;

float flame_edge = flameMask * 0.3*(pos.y+1.0);
    float edge = clamp(value-flame_edge*2., 0.0 , 1.0);
    float hardMask = smoothstep(flame_edge,flame_edge+0.1, value);
    float highlight = 1.0-edge*edge;
        
    uv3d = vec3(uv.x, uv.y, 0.0) + vec3(0.0, -u_time*0.01, u_time*0.025);

highlight = pow(highlight, 2.0);
        
    // colour += glow * 2.;
    colour = highlightColour*(hardMask*highlight);
    colour = mix(bgColour, colour, hardMask);
    colour += bodyColour*flameMask*flameMask;
    
    gl_FragColor = vec4(colour,1.0);
  }
</script>

css

JavaScript

/*
              Most of the stuff in here is just bootstrapping. Essentially it's just
              setting ThreeJS up so that it renders a flat surface upon which to draw 
              the shader. The only thing to see here really is the uniforms sent to 
              the shader. Apart from that all of the magic happens in the HTML view
              under the fragment shader.
              */

var container = void 0;
var camera = void 0,scene = void 0,renderer = void 0;
var uniforms = void 0;

var loader = new THREE.TextureLoader();
var texture = void 0;
loader.setCrossOrigin("anonymous");
loader.load(
'http://www.jq22.com/jswj/noise.png',
function do_something_with_texture(tex) {
  texture = tex;
  texture.wrapS = THREE.RepeatWrapping;
  texture.wrapT = THREE.RepeatWrapping;
  texture.minFilter = THREE.LinearFilter;
  init();
  animate();
});

function init() {
  container = document.getElementById('container');

camera = new THREE.Camera();
  camera.position.z = 1;

scene = new THREE.Scene();

var geometry = new THREE.PlaneBufferGeometry(2, 2);

uniforms = {
    u_time: { type: "f", value: 1.0 },
    u_resolution: { type: "v2", value: new THREE.Vector2() },
    u_noise: { type: "t", value: texture },
    u_mouse: { type: "v2", value: new THREE.Vector2() } };

var material = new THREE.ShaderMaterial({
    uniforms: uniforms,
    vertexShader: document.getElementById('vertexShader').textContent,
    fragmentShader: document.getElementById('fragmentShader').textContent });

material.extensions.derivatives = true;

var mesh = new THREE.Mesh(geometry, material);
  scene.add(mesh);

renderer = new THREE.WebGLRenderer();
  renderer.setPixelRatio(window.devicePixelRatio);

container.appendChild(renderer.domElement);

onWindowResize();
  window.addEventListener('resize', onWindowResize, false);

document.addEventListener('pointermove', function (e) {
    var ratio = window.innerHeight / window.innerWidth;
    uniforms.u_mouse.value.x = (e.pageX - window.innerWidth / 2) / window.innerWidth / ratio;
    uniforms.u_mouse.value.y = (e.pageY - window.innerHeight / 2) / window.innerHeight * -1;

e.preventDefault();
  });
}

function onWindowResize(event) {
  renderer.setSize(window.innerWidth, window.innerHeight);
  uniforms.u_resolution.value.x = renderer.domElement.width;
  uniforms.u_resolution.value.y = renderer.domElement.height;
}

function animate(delta) {
  requestAnimationFrame(animate);
  render(delta);
}

var capturer = new CCapture({
  verbose: true,
  framerate: 60,
  // motionBlurFrames: 4,
  quality: 90,
  format: 'webm',
  workersPath: 'js/' });

var capturing = false;

isCapturing = function isCapturing(val) {
  if (val === false && window.capturing === true) {
    capturer.stop();
    capturer.save();
  } else if (val === true && window.capturing === false) {
    capturer.start();
  }
  capturing = val;
};
toggleCapture = function toggleCapture() {
  isCapturing(!capturing);
};

window.addEventListener('keyup', function (e) {if (e.keyCode == 68) toggleCapture();});

var then = 0;
function render(delta) {

uniforms.u_time.value = delta * 0.0005;
  renderer.render(scene, camera);

if (capturing) {
    capturer.capture(renderer.domElement);
  }
}

粒子时间文字 hover canvas 3d 游戏音乐火焰水波轮播图鼠标跟随动画 css 加载动画导航菜单按钮滑块 tab 弹出层统计图 svg