火焰

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#define M_PI 3.1415926535897932384626433832795
  #define color1 vec4(1.0, 1.0, 1.0, 1.0)
  #define color2 vec4(1.0, 0.8, 0.2, 1.0)
  #define color3 vec4(1.0, 0.03, 0.0, 1.0)
  #define color4 vec4(0.05, 0.02, 0.02, 1.0)
  #define noiseSteps 1
  #define noiseAmplitude 0.06
  #define noiseFrequency 4.0
  #define animation vec3(0.0, -6.0, 0.5)
  #define background vec4(0.1, 0.0, 0.0, 1.0)

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; }

float snoise (vec3 v) {
    const vec2 C = vec2(1.0/6.0, 1.0/3.0);
    const vec4 D = vec4(0.0, 0.5, 1.0, 2.0);
    vec3 i  = floor(v + dot(v, C.yyy)); // First corner
    vec3 x0 = v - i + dot(i, C.xxx);
    vec3 g = step(x0.yzx, x0.xyz); // Other corners
    vec3 l = 1.0 - g;
    vec3 i1 = min(g.xyz, l.zxy);
    vec3 i2 = max(g.xyz, l.zxy);
    vec3 x1 = x0 - i1 + C.xxx;
    vec3 x2 = x0 - i2 + C.yyy; // 2.0*C.x = 1/3 = C.y
    vec3 x3 = x0 - D.yyy;      // -1.0+3.0*C.x = -0.5 = -D.y
    i = mod289(i); // Permutations
    vec4 p = permute( permute( permute( i.z + vec4(0.0, i1.z, i2.z, 1.0)) + i.y + vec4(0.0, i1.y, i2.y, 1.0 )) + i.x + vec4(0.0, i1.x, i2.x, 1.0 ));
    // Gradients: 7x7 points over a square, mapped onto an octahedron.
    // The ring size 17*17 = 289 is close to a multiple of 49 (49*6 = 294)
    float n_ = 0.142857142857; // 1.0/7.0
    vec3  ns = n_ * D.wyz - D.xzx;
    vec4 j = p - 49.0 * floor(p * ns.z * ns.z);  //  mod(p,7*7)
    vec4 x_ = floor(j * ns.z);
    vec4 y_ = floor(j - 7.0 * x_);    // mod(j,N)
    vec4 x = x_ *ns.x + ns.yyyy;
    vec4 y = y_ *ns.x + ns.yyyy;
    vec4 h = 1.0 - abs(x) - abs(y);
    vec4 b0 = vec4(x.xy, y.xy);
    vec4 b1 = vec4(x.zw, y.zw);
    vec4 s0 = floor(b0) * 2.0 + 1.0;
    vec4 s1 = floor(b1) * 2.0 + 1.0;
    vec4 sh = -step(h, vec4(0.0));
    vec4 a0 = b0.xzyw + s0.xzyw * sh.xxyy;
    vec4 a1 = b1.xzyw + s1.xzyw * sh.zzww;
    vec3 p0 = vec3(a0.xy, h.x);
    vec3 p1 = vec3(a0.zw, h.y);
    vec3 p2 = vec3(a1.xy, h.z);
    vec3 p3 = vec3(a1.zw, h.w);
    //Normalise gradients
    vec4 norm = taylorInvSqrt(vec4(dot(p0,p0), dot(p1,p1), dot(p2, p2), dot(p3,p3)));
    p0 *= norm.x;
    p1 *= norm.y;
    p2 *= norm.z;
    p3 *= norm.w;
    // Mix final noise value
    vec4 m = max(0.6 - vec4(dot(x0,x0), dot(x1,x1), dot(x2,x2), dot(x3,x3)), 0.0);
    m = m * m;
    return 42.0 * dot( m*m, vec4( dot(p0,x0), dot(p1,x1), dot(p2,x2), dot(p3,x3)));
  }

float turbulence (vec3 position, float minFreq, float maxFreq, float qWidth) {
    float value = 0.0;
    float cutoff = clamp(0.5 / qWidth, 0.0, maxFreq);
    float fade;
    float fOut = minFreq;
    for (int i = noiseSteps ; i >= 0 ; i--) {
      if (fOut >= 0.5 * cutoff) break;
      fOut *= 2.0;
      value += abs(snoise(position * fOut)) / fOut;
    }
    fade = clamp(2.0 * (cutoff - fOut) / cutoff, 0.0, 1.0);
    value += fade * abs(snoise(position * fOut)) / fOut;
    return 1.0 - value;
  }

vec4 fireShade (float distance) {
    float c1 = saturate(distance * 5.0 + 0.5);
    float c2 = saturate(distance * 5.0);
    float c3 = saturate(distance * 3.4 - 0.5);
    vec4 a = mix(color1, color2, c1);
    vec4 b = mix(a, color3, c2);
    return mix(b, color4, c3);
  }

float maxcomp (in vec3 p) {
    return max(p.x, max(p.y, p.z));
  }

vec3 opTrans (vec3 p, vec3 d) {
    return p - d;
  }

vec3 opRep (vec3 p, vec3 spacing) {
    return mod(p, spacing) - spacing / 2.0;
  }

vec3 opTwist (vec3 p, float q) {
    float c = cos(q * p.y + q);
    float s = sin(q * p.y + q);
    mat2 m = mat2(c, -s, s, c);
    return vec3(m * p.xz, p.y);
  }

float sdPlane (vec3 p, vec4 n) {
    return dot(p, n.xyz) + n.w;
  }

float sdPyramid4 (vec3 p, vec3 h) {
    p.xz = abs(p.xz);
    vec3 n = normalize(h);
    return sdPlane(p, vec4(n, 0.0));
  }

float sdTriPrism (vec3 p, vec2 h) {
    vec3 q = abs(p);
    return max(q.z - h.y, max(q.x * 0.866025 + p.y * 0.5, -p.y) - h.x * 0.5);
  }

float sdBox (vec3 p, vec3 b, float r) {
    vec3 d = abs(p) - b;
    return min(maxcomp(d), 0.0) - r + length(max(d, 0.0));
  }

float sdSphere (vec3 p, float r) {
    return length(p) - r;
  }

vec2 sceneSDF (vec3 p) {
    float time = uTime;
    float noise = saturate(abs(turbulence(p * noiseFrequency + animation * time, 0.1, 1.5, 0.03) * noiseAmplitude));
  	vec3 q = p;
    float d = 0.0;
    d = sdSphere(q, 0.5) - noise;
    return vec2(d, noise);
  }

vec2 shortestDistanceToSurface (vec3 eye, vec3 marchingDirection, float start, float end) {
    float depth = start;
    for (int i = 0; i < MAX_MARCHING_STEPS; i++) {
      vec2 response = sceneSDF(eye + depth * marchingDirection);
      float dist = response.x;
      float noise = response.y;
      if (dist < EPSILON) {
        return vec2(depth, noise);
      }
      depth += dist;
      if (depth >= end) {
        return vec2(end, noise);
      }
    }
    return vec2(end, 0.0);
  }

vec3 rayDirection (float fieldOfView, vec2 size, vec2 fragCoord) {
    vec2 xy = fragCoord - size / 2.0;
    float z = size.y / tan(radians(fieldOfView) / 2.0);
    return normalize(vec3(xy, -z));
  }

mat3 rotationXY (vec2 angle) {
    vec2 c = cos(angle);
    vec2 s = sin(angle);
    return mat3(
      c.y      ,  0.0, -s.y,
      s.y * s.x,  c.x,  c.y * s.x,
      s.y * c.x, -s.x,  c.y * c.x
    );
  }

vec3 hsb2rgb (in vec3 c) {
    vec3 rgb = clamp(abs(mod(c.x * 6.0 + vec3(0.0, 4.0, 2.0), 6.0) - 3.0) - 1.0, 0.0, 1.0);
    rgb = rgb * rgb * (3.0 - 2.0 * rgb);
    return c.z * mix(vec3(1.0), rgb, c.y);
  }

void main () {
    vec3 viewDir = rayDirection(45.0, uResolution.xy, vec2(gl_FragCoord.xy));
    float time = uTime / 6.0;
    vec3 eye = vec3(0.0, 0.0, 5.0);
    mat3 rot = rotationXY(vec2(0.0, sin(time) * 3.0));
    eye = rot * eye;
    viewDir = rot * viewDir;
    vec3 dir = viewDir;
    vec2 distDisp = shortestDistanceToSurface(eye, dir, MIN_DIST, MAX_DIST);
    float dist = distDisp.x;
    float displacement = distDisp.y;
    if (dist > MAX_DIST - EPSILON) {
      gl_FragColor = vec4(0.0, 0.0, 0.0, 0.0);
      return;
    }
    vec3 p = eye + dist * dir;
    vec3 K_a = vec3(0.2, 0.2, 0.2);
    vec3 K_d = hsb2rgb(vec3(fract(uTime / 8.0), 0.9, 0.85));
    vec3 K_s = vec3(1.0, 1.0, 1.0);
    float shininess = 10.0;
    vec4 color = mix(fireShade(displacement), vec4(K_s, 1.0), float(displacement >= 0.5));
    gl_FragColor = color;
  }
</script>

css

JavaScript

setTimeout(() => {
  const container = document.getElementById('js-app');
  const camera = new THREE.Camera();
  camera.position.z = 1;
  const scene = new THREE.Scene();
  const geometry = new THREE.PlaneBufferGeometry(2, 2);
  const uniforms = {
    uTime: { type: "f", value: 1.0 },
    uResolution: { type: "v2", value: new THREE.Vector2() },
    uMouse: { type: "v2", value: new THREE.Vector2() }
  };
  const material = new THREE.ShaderMaterial({
    uniforms,
    vertexShader: document.getElementById('vertexShader').textContent,
    fragmentShader: document.getElementById('fragmentShader').textContent
  });
  const mesh = new THREE.Mesh(geometry, material);
  scene.add(mesh);
  const renderer = new THREE.WebGLRenderer();
  renderer.setPixelRatio(window.devicePixelRatio);
  container.appendChild(renderer.domElement);
  const onWindowResize = handleWindowResize(renderer, uniforms);
  onWindowResize();
  window.addEventListener('resize', onWindowResize, false);
  document.onmousemove = function (e) {
    uniforms.uMouse.value.x = e.pageX
    uniforms.uMouse.value.y = e.pageY
  }
  animate(renderer, scene, camera, uniforms);
});

function handleWindowResize (renderer, uniforms) {
  return () => {
    const size = 280; // Math.min(window.innerWidth, window.innerHeight);
    renderer.setSize(size, size);
    uniforms.uResolution.value.x = renderer.domElement.width;
    uniforms.uResolution.value.y = renderer.domElement.height;
  };
}

function animate (renderer, scene, camera, uniforms) {
  requestAnimationFrame(() => {
    animate(renderer, scene, camera, uniforms);
  });
  render(renderer, scene, camera, uniforms);
}

function render (renderer, scene, camera, uniforms) {
  uniforms.uTime.value += 16 / 1000;
  renderer.render(scene, camera);
}

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