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HTML

              
                <script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/88/three.min.js"></script>
<script id="vertexShader" type="x-shader/x-vertex">
    void main() {
        gl_Position = vec4( position, 1.0 );
    }
</script>
<script id="fragmentShader" type="x-shader/x-fragment">
    uniform vec2 u_resolution;
    uniform float u_time;
    uniform vec2 u_mouse;
    uniform sampler2D u_env;
  
    const int octaves = 2;
    const float seed = 43758.5453123;
    const float seed2 = 73156.8473192;
    // Epsilon value
    const float eps = 0.005;
  
    const vec3 ambientLight = 0.99 * vec3(1.0, 1.0, 1.0);
    const vec3 light1Pos = vec3(10., 5.0, -25.0);
    const vec3 light1Intensity = vec3(0.35);
    const vec3 light2Pos = vec3(-20., -25.0, 85.0);
    const vec3 light2Intensity = vec3(0.2);
  
    // movement variables
    vec3 movement = vec3(.0);

    // Gloable variables for the raymarching algorithm.
    const int maxIterations = 1024;
    const int maxIterationsRef = 256;
    const int maxIterationsShad = 16;
    const float stepScale = .3;
    const float stepScaleRef = 0.95;
    const float stopThreshold = 0.001;
  
  
  mat4 rotationMatrix(vec3 axis, float angle)
  {
      axis = normalize(axis);
      float s = sin(angle);
      float c = cos(angle);
      float oc = 1.0 - c;

      return mat4(oc * axis.x * axis.x + c,           oc * axis.x * axis.y - axis.z * s,  oc * axis.z * axis.x + axis.y * s,  0.0,
                  oc * axis.x * axis.y + axis.z * s,  oc * axis.y * axis.y + c,           oc * axis.y * axis.z - axis.x * s,  0.0,
                  oc * axis.z * axis.x - axis.y * s,  oc * axis.y * axis.z + axis.x * s,  oc * axis.z * axis.z + c,           0.0,
                  0.0,                                0.0,                                0.0,                                1.0);
  }
  
  
  float length2( vec2 p )
  {
    return sqrt( p.x*p.x + p.y*p.y );
  }

  float length6( vec2 p )
  {
    p = p*p*p; p = p*p;
    return pow( p.x + p.y, 1.0/6.0 );
  }

  float length8( vec2 p )
  {
    p = p*p; p = p*p; p = p*p;
    return pow( p.x + p.y, 1.0/8.0 );
  }
  
  // Distance function primitives
  // Reference: http://iquilezles.org/www/articles/distfunctions/distfunctions.htm
  float sdBox( vec3 p, vec3 b )
  {
    vec3 d = abs(p) - b;
    return min(max(d.x,max(d.y,d.z)),0.0) + length(max(d,0.0));
  }
  float udBox( vec3 p, vec3 b )
  {
    return length(max(abs(p)-b,0.0));
  }
  float udRoundBox( vec3 p, vec3 b, float r )
  {
    return length(max(abs(p)-b,0.0))-r;
  }
  float sdSphere( vec3 p, float s )
  {
    return length(p)-s;
  }
  float sdCylinder( vec3 p, vec3 c )
  {
    return length(p.xz-c.xy)-c.z;
  }
  float sdCappedCylinder( vec3 p, vec2 h )
  {
    vec2 d = abs(vec2(length(p.xz),p.y)) - h;
    return min(max(d.x,d.y),0.0) + length(max(d,0.0));
  }
  float sdTorus82( vec3 p, vec2 t )
  {
    vec2 q = vec2(length2(p.xz)-t.x,p.y);
    return length8(q)-t.y;
  }
  float sdPlane( vec3 p)
  {
    return p.y;
  }
  
  // smooth min
  // reference: http://iquilezles.org/www/articles/smin/smin.htm
  float smin(float a, float b, float k) {
      float res = exp(-k*a) + exp(-k*b);
      return -log(res)/k;
  }
  
  vec3 random3( vec3 p ) {
      return fract(sin(vec3(dot(p,vec3(127.1,311.7,319.8)),dot(p,vec3(269.5,183.3, 415.2)),dot(p,vec3(362.9,201.5,134.7))))*43758.5453);
  }
  vec2 random2( vec2 p ) {
      return fract(sin(vec2(dot(p,vec2(127.1,311.7)),dot(p,vec2(269.5,183.3))))*43758.5453);
  }
  
  // The world!
  float world_sdf(in vec3 p) {
    float world = 10.;
    
    // p.xz += 2.;
    // p.xz = mod(p.xz, 4.) - 2.;
    
    vec2 polar = vec2(length(p.xz), p.y * 5.);
    float px = polar.x;
    
    polar.x = sin(polar.x * 5. - u_time * 5.);
    
    world = length(polar) - .4;
    // world *= min( 1., px);
    // float variance = (sin(p.y + u_time) * 8. + cos(p.z + u_time) * 10.) * .5;
    // world = smin(world, length(p.zx) - .05, 5.);
    world = smin(world, p.y+.1, 3.);
    world = smin(world, length(p.zx + sin(p.y * 15. + u_time * 50.) * .002 + cos(p.z * 15. + u_time * 100.) * .002) - .08, 8.);
    
    return world;
  }
  
  // Fuck yeah, normals!
  vec3 calculate_normal(in vec3 p)
  {
    const vec3 small_step = vec3(0.0001, 0.0, 0.0);
    
    float gradient_x = world_sdf(vec3(p.x + eps, p.y, p.z)) - world_sdf(vec3(p.x - eps, p.y, p.z));
    float gradient_y = world_sdf(vec3(p.x, p.y + eps, p.z)) - world_sdf(vec3(p.x, p.y - eps, p.z));
    float gradient_z = world_sdf(vec3(p.x, p.y, p.z  + eps)) - world_sdf(vec3(p.x, p.y, p.z - eps));
    
    vec3 normal = vec3(gradient_x, gradient_y, gradient_z);

    return normalize(normal);
  }

  // Raymarching.
  float rayMarching( vec3 origin, vec3 dir, float start, float end, inout float field ) {
    
    float sceneDist = 1e4;
    float rayDepth = start;
    for ( int i = 0; i < maxIterations; i++ ) {
      sceneDist = world_sdf( origin + dir * rayDepth ); // Distance from the point along the ray to the nearest surface point in the scene.

      if (( sceneDist < stopThreshold ) || (rayDepth >= end)) {        
        break;
      }
      // We haven't hit anything, so increase the depth by a scaled factor of the minimum scene distance.
      rayDepth += sceneDist * stepScale;
    }
  
    if ( sceneDist >= stopThreshold ) rayDepth = end;
    else rayDepth += sceneDist;
      
    // We've used up our maximum iterations. Return the maximum distance.
    return rayDepth;
  }
// Raymarching reflections. It appears that GPUs won't do loops with variable iterations, but reflections are expensive, so you need to use fewer
// iterations. Therefore, I've had to make an almost duplicate version of the raymarching function above. Surely, there's a better way, but at least 
// it works. Reflection are a little fiddly, but otherwise easy to implement. Unfortunately, they take up extra iterations that, sometimes, your poor 
// GPU can't handle.
//
// Anyway, once you've hit a surface point in the scene, the surface point will become the new origin, and the normalized reflected vector 
// will become the new ray direction (dir). Feed those into the function below, then use the resultant distance to obtain the surface the reflected 
// ray hits (if any). Put that result into the light equation, then add a portion of the color to the color you've already attained from the 
// first raymarching pass. Simple... once you've done it a few times and get used to the process.
float rayMarchingReflections( vec3 origin, vec3 dir, float start, float end ) {
	
	float sceneDist = 1e4;
	float rayDepth = start; // Ray depth. "start" is usually zero, but for various reasons, you may wish to start the ray further away from the origin.
	for ( int i = 0; i < maxIterationsRef; i++ ) {
		sceneDist = world_sdf( origin + dir * rayDepth ); // Distance from the point along the ray to the nearest surface point in the scene.

		if (( sceneDist < stopThreshold ) || (rayDepth >= end)) {
		
		    // (rayDepth >= end) - The casted ray has proceeded past the end zone, so it's time to return the maximum distance.
		     
		    // (sceneDist < stopThreshold) - The distance is pretty close to zero, which means the point on the ray has effectively come into contact 
		    // with the surface. Therefore, we can return the distance, which can be used to calculate the surface point.
			
			break; 
		}
		
		// We haven't hit anything, so increase the depth by a scaled factor of the minimum scene distance.
		rayDepth += sceneDist * stepScaleRef;

	}
	

	// I'd normally arrange for the following to be taken care of prior to exiting the loop, but Firefox won't execute anything before
	// the "break" statement. Why? I couldn't say. I'm not even game enough to put more than one return statement.	
	//
	// Normally, you'd just return the rayDepth value only, but for some reason that escapes my sense of logic - and everyone elses, for 
	// that matter, adding the final, infinitessimal scene distance value (sceneDist) seems to reduce a lot of popping artifacts. If 
	// someone could put me out of my misery and prove why I should either leave it there, or get rid of it, it'd be appreciated.
	if ( sceneDist > stopThreshold ) rayDepth = end;
	else rayDepth += sceneDist;
	
	// We've used up our maximum iterations. Return the maximum distance.
	return rayDepth;
}

  

  // Shadows
  // Reference at: http://www.iquilezles.org/www/articles/rmshadows/rmshadows.htm
  float softShadow(vec3 ro, vec3 lightPos, float start, float k){
    
      vec3 rd = lightPos - ro;
      float end = length(rd);

      float shade = 1.0;

      float dist = start;
      float stepDist = start;

      for (int i=0; i<maxIterationsShad; i++){
          float h = world_sdf(ro + rd*dist);
          shade = min(shade, k*h/dist);
          
          dist += min(h, stepDist*2.); // The best of both worlds... I think. 
          
          if (h<0.001 || dist > end) break; 
      }

      return min(max(shade, 0.) + 0.3, 1.0); 
  }

  // Based on original by IQ - optimized to remove a divide
  float calculateAO(vec3 p, vec3 n)
  {
     const float AO_SAMPLES = 5.0;
     float r = 0.0;
     float w = 1.0;
     for (float i=1.0; i<=AO_SAMPLES; i++)
     {
        float d0 = i * 0.15; // 1.0/AO_SAMPLES
        r += w * (d0 - world_sdf(p + n * d0));
        w *= 0.5;
     }
     return 1.0-clamp(r,0.0,1.0);
  }
  
  /**
   * Lighting
   * This stuff is way way better than the model I was using.
   * Courtesy Shane Warne
   * Reference: http://raymarching.com/
   * -------------------------------------
   * */
  
  // Lighting.
  vec3 lighting( vec3 sp, vec3 camPos, int reflectionPass, float dist, float field, vec3 rd, vec3 surfNormal) {
    
    // Start with black.
    vec3 sceneColor = vec3(0.0);

    vec3 objColor = vec3(1.0, .5, 1.5) * .5;
    
    float a = atan(surfNormal.z,surfNormal.x );
    
    // Holy fuck balls, fresnel!
    float bias = .2;
    float scale = 10.;
    float power = 5.1;
    // specular = max(0.0, min(1.0, bias + scale * (1.0 + length(camPos-sp * surfNormal)) * power));
    float shade = bias + (scale * pow(1.0 + dot(normalize(sp-camPos), surfNormal), power));
    
    vec3 reflection = normalize(reflect(camPos, surfNormal));
    objColor += texture2D(u_env, (reflection.xz) * 2.).rgb * .6;
    
    // objColor += texture2D(u_env, (surfNormal.xy - normalize(camPos.xy
                                                           // )) * 2.).rgb * .6;

    // Lighting.

    // lp - Light position. Keeping it in the vacinity of the camera, but away from the objects in the scene.
    vec3 lp = vec3(-0.5 + sin(u_time), -0.5, -1.0) + movement;
    // ld - Light direction.
    vec3 ld = lp-sp;
    // lcolor - Light color.
    vec3 lcolor = vec3(1.,0.97,0.92) * .8;
    
     // Light falloff (attenuation).
    float len = length( ld ); // Distance from the light to the surface point.
    ld /= len; // Normalizing the light-to-surface, aka light-direction, vector.
    // float lightAtten = min( 1.0 / ( 0.15*len*len ), 1.0 ); // Removed light attenuation for this because I want the fade to white
    
    float sceneLen = length(camPos - sp); // Distance of the camera to the surface point
    float sceneAtten = min( 1.0 / ( 0.015*sceneLen*sceneLen ), 1.0 ); // Keeps things between 0 and 1.   

    // Obtain the reflected vector at the scene position "sp."
    vec3 ref = reflect(-ld, surfNormal);
    
    float ao = 1.0; // Ambient occlusion.
    // ao = calculateAO(sp, surfNormal); // Ambient occlusion.

    float ambient = .5; //The object's ambient property.
    float specularPower = 200.; // The power of the specularity. Higher numbers can give the object a harder, shinier look.
    float diffuse = max( 0.0, dot(surfNormal, ld) ); //The object's diffuse value.
    float specular = max( 0.0, dot( ref, normalize(camPos-sp)) ); //The object's specular value.
    specular = pow(specular, specularPower); // Ramping up the specular value to the specular power for a bit of shininess.
    	
    // Bringing all the lighting components togethr to color the screen pixel.
    sceneColor = objColor * (diffuse*0.8+ambient) + specular*0.5 * shade + shade * .5;
    sceneColor *= lcolor;
    // sceneColor += (objColor*(diffuse*0.8+ambient)+specular*0.5)*lcolor*1.3;
    sceneColor = mix(sceneColor, vec3(1.), 1.-sceneAtten*sceneAtten); // fog
    
    // float shadow = softShadow(sp, lp, .005, .5);
    // sceneColor *= clamp(shadow * 2., 0., 1.);
    // sceneColor = vec3(shade * 2.);
    
    return sceneColor;

  }

    void main() {
      
      // Setting up our screen coordinates.
      vec2 aspect = vec2(u_resolution.x/u_resolution.y, 1.0); //
      vec2 uv = (2.0*gl_FragCoord.xy/u_resolution.xy - 1.0)*aspect;
      
      // This just gives us a touch of fisheye
      // uv *= 1. + dot(uv, uv) * 0.4;
      
      // movement
      movement = vec3(0.);
      
      // The sin in here is to make it look like a walk.
      vec3 lookAt = vec3(-0., 0.2, 1.);  // This is the point you look towards, or at, if you prefer.
      vec3 camera_position = vec3(-0., 2., -4.0); // This is the point you look from, or camera you look at the scene through. Whichever way you wish to look at it.
      camera_position.xz += vec2((u_mouse.x * 10.), (u_mouse.y * 10.));
      
      lookAt += movement;
      // lookAt.z += sin(u_time / 10.) * .5;
      // lookAt.x += cos(u_time / 10.) * .5;
      camera_position += movement;
      
      vec3 forward = normalize(lookAt-camera_position); // Forward vector.
      vec3 right = normalize(vec3(forward.z, 0., -forward.x )); // Right vector... or is it left? Either way, so long as the correct-facing up-vector is produced.
      vec3 up = normalize(cross(forward,right)); // Cross product the two vectors above to get the up vector.

      // FOV - Field of view.
      float FOV = 0.4;

      // ro - Ray origin.
      vec3 ro = camera_position; 
      // rd - Ray direction.
      vec3 rd = normalize(forward + FOV*uv.x*right + FOV*uv.y*up);
      
      // float l = atan(u_mouse.y, u_mouse.x);
      // rd.xy *= mat2(cos(u_mouse.x), -sin(u_mouse.y), sin(u_mouse.y), cos(u_mouse.x));
      
      // Ray marching.
      const float clipNear = 0.0;
      const float clipFar = 32.0;
      float field = 0.;
      float dist = rayMarching(ro, rd, clipNear, clipFar, field );

      // sp - Surface position. If we've made it this far, we've hit something.
      vec3 sp = ro + rd*dist;
      
      // Obtain the surface normal at the scene position "sp."
      vec3 surfNormal = calculate_normal(sp);
      
      vec3 ref = vec3(0.);
      
      if ( dist >= clipFar ) {
        gl_FragColor = vec4(vec3(1.), 1.0);
        return;
      }


      // Light the pixel that corresponds to the surface position. The last entry indicates that it's not a reflection pass
      // which we're not up to yet.
      vec3 sceneColor = lighting( sp, camera_position, 0, dist, field, rd, surfNormal);
      
      
      // Reflection

      // We've completed the first surface collision pass, so now we can begin the reflected ray pass. It's done in the same way
      // as above, except that our origin is now the point on the surface of the object we've just hit (sp), and the ray direction
      // (rd) is simply the reflected ray (ref). If we construct a vector from the light to the surface postion, the reflected 
      // ray will be the ray cast off in the mirror reflection across the surface normal - A diagram would be helpful right about 
      // now, but I'll probably write about this later. For now, just look one up on the net.
      //
      // By the way, in theory, we're not restricted to just one reflection pass. We could do this multiple times, by obtaining the 
      // reflected ray of the reflected ray, and so forth. Unfortunately, modern GPUs have their limits, so just the one pass
      // will have to suffice. It'd be nice to have more lights too, but that means even more passes, so just the one will have to do.
      //
      // rd = ref, in this case. It has already been calculated during the lighting function, so we're sacrificing a little readability 
      // and reusing it. Correct me if I'm wrong, but I'm pretty sure the reflected vector is already normalized, so there's no need to 
      // normalize it again.
      //
      // The last thing I'll mention - and it's something that can help you avoid a lot of grief when doing reflections - is the point
      // where you cast the ray from. In theory, it's the surface point. However, if you use that exact point, the first surface you'll
      // return a hit from is the surface itself. Therefore, you need to inch the ray away from the surface point enough to not return 
      // a collision. Just over the stop-threshold will do, but I've moved it just a little further than that. This is old code, so I 
      // can't remember why I chose 5 times that amount. Perhaps I was being paranoid, but it works.
//       dist = rayMarchingReflections(sp, reflect(rd, surfNormal), stopThreshold*5.0, clipFar );
//       vec3 rsp = sp + ref*dist;
      
//       // The reflected ray hit something, so light the "reflected" pixel that corresponds to the "reflected" surface position.
//       // The last entry "1" tells the lighting function to not include shadows, which are less important during a reflection pass.
//         float refCoef = 0.35; // Reflective coefficient. The amount of reflected light we wish to incorporate into the final color.
//         sceneColor = lighting( rsp, camera_position, 1, dist, field, rd, surfNormal)*refCoef;


      // Clamping the lit pixel, then put it on the screen.
      gl_FragColor = vec4(clamp(sceneColor, 0.0, 1.0), 1.0);


    }
</script>


<div id="container" touch-action="none"></div>
              
            
!

CSS

              
                body {
  margin: 0;
  padding: 0;
}

#container {
  position: fixed;
  touch-action: none;
}
              
            
!

JS

              
                /*
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.
*/

let container;
let camera, scene, renderer;
let uniforms;

let loader=new THREE.TextureLoader();
let texture, env;
loader.setCrossOrigin("anonymous");
loader.load(
  'https://s3-us-west-2.amazonaws.com/s.cdpn.io/982762/noise.png',
  function do_something_with_texture(tex) {
    texture = tex;
    texture.wrapS = THREE.RepeatWrapping;
    texture.wrapT = THREE.RepeatWrapping;
    texture.minFilter = THREE.LinearFilter;
    loader.load('https://s3-us-west-2.amazonaws.com/s.cdpn.io/982762/env_lat-lon.png', (tex) => {
      env = tex;
      env.wrapS = THREE.RepeatWrapping;
      env.wrapT = THREE.RepeatWrapping;
      env.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_env: { type: "t", value: env },
    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', (e)=> {
    let 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() {
  requestAnimationFrame( animate );
  render();
}

function render() {
  uniforms.u_time.value += 0.01;
  renderer.render( scene, camera );
}
              
            
!
999px

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