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HTML 

              
                <script type="x-shader/x-vertex" id="vertexshader">
        attribute float displacement;
        vec3 vLut[256] =vec3[](vec3(0.18995,0.07176,0.23217),vec3(0.19483,0.08339,0.26149),vec3(0.19956,0.09498,0.29024),vec3(0.20415,0.10652,0.31844),vec3(0.20860,0.11802,0.34607),vec3(0.21291,0.12947,0.37314),vec3(0.21708,0.14087,0.39964),vec3(0.22111,0.15223,0.42558),vec3(0.22500,0.16354,0.45096),vec3(0.22875,0.17481,0.47578),vec3(0.23236,0.18603,0.50004),vec3(0.23582,0.19720,0.52373),vec3(0.23915,0.20833,0.54686),vec3(0.24234,0.21941,0.56942),vec3(0.24539,0.23044,0.59142),vec3(0.24830,0.24143,0.61286),vec3(0.25107,0.25237,0.63374),vec3(0.25369,0.26327,0.65406),vec3(0.25618,0.27412,0.67381),vec3(0.25853,0.28492,0.69300),vec3(0.26074,0.29568,0.71162),vec3(0.26280,0.30639,0.72968),vec3(0.26473,0.31706,0.74718),vec3(0.26652,0.32768,0.76412),vec3(0.26816,0.33825,0.78050),vec3(0.26967,0.34878,0.79631),vec3(0.27103,0.35926,0.81156),vec3(0.27226,0.36970,0.82624),vec3(0.27334,0.38008,0.84037),vec3(0.27429,0.39043,0.85393),vec3(0.27509,0.40072,0.86692),vec3(0.27576,0.41097,0.87936),vec3(0.27628,0.42118,0.89123),vec3(0.27667,0.43134,0.90254),vec3(0.27691,0.44145,0.91328),vec3(0.27701,0.45152,0.92347),vec3(0.27698,0.46153,0.93309),vec3(0.27680,0.47151,0.94214),vec3(0.27648,0.48144,0.95064),vec3(0.27603,0.49132,0.95857),vec3(0.27543,0.50115,0.96594),vec3(0.27469,0.51094,0.97275),vec3(0.27381,0.52069,0.97899),vec3(0.27273,0.53040,0.98461),vec3(0.27106,0.54015,0.98930),vec3(0.26878,0.54995,0.99303),vec3(0.26592,0.55979,0.99583),vec3(0.26252,0.56967,0.99773),vec3(0.25862,0.57958,0.99876),vec3(0.25425,0.58950,0.99896),vec3(0.24946,0.59943,0.99835),vec3(0.24427,0.60937,0.99697),vec3(0.23874,0.61931,0.99485),vec3(0.23288,0.62923,0.99202),vec3(0.22676,0.63913,0.98851),vec3(0.22039,0.64901,0.98436),vec3(0.21382,0.65886,0.97959),vec3(0.20708,0.66866,0.97423),vec3(0.20021,0.67842,0.96833),vec3(0.19326,0.68812,0.96190),vec3(0.18625,0.69775,0.95498),vec3(0.17923,0.70732,0.94761),vec3(0.17223,0.71680,0.93981),vec3(0.16529,0.72620,0.93161),vec3(0.15844,0.73551,0.92305),vec3(0.15173,0.74472,0.91416),vec3(0.14519,0.75381,0.90496),vec3(0.13886,0.76279,0.89550),vec3(0.13278,0.77165,0.88580),vec3(0.12698,0.78037,0.87590),vec3(0.12151,0.78896,0.86581),vec3(0.11639,0.79740,0.85559),vec3(0.11167,0.80569,0.84525),vec3(0.10738,0.81381,0.83484),vec3(0.10357,0.82177,0.82437),vec3(0.10026,0.82955,0.81389),vec3(0.09750,0.83714,0.80342),vec3(0.09532,0.84455,0.79299),vec3(0.09377,0.85175,0.78264),vec3(0.09287,0.85875,0.77240),vec3(0.09267,0.86554,0.76230),vec3(0.09320,0.87211,0.75237),vec3(0.09451,0.87844,0.74265),vec3(0.09662,0.88454,0.73316),vec3(0.09958,0.89040,0.72393),vec3(0.10342,0.89600,0.71500),vec3(0.10815,0.90142,0.70599),vec3(0.11374,0.90673,0.69651),vec3(0.12014,0.91193,0.68660),vec3(0.12733,0.91701,0.67627),vec3(0.13526,0.92197,0.66556),vec3(0.14391,0.92680,0.65448),vec3(0.15323,0.93151,0.64308),vec3(0.16319,0.93609,0.63137),vec3(0.17377,0.94053,0.61938),vec3(0.18491,0.94484,0.60713),vec3(0.19659,0.94901,0.59466),vec3(0.20877,0.95304,0.58199),vec3(0.22142,0.95692,0.56914),vec3(0.23449,0.96065,0.55614),vec3(0.24797,0.96423,0.54303),vec3(0.26180,0.96765,0.52981),vec3(0.27597,0.97092,0.51653),vec3(0.29042,0.97403,0.50321),vec3(0.30513,0.97697,0.48987),vec3(0.32006,0.97974,0.47654),vec3(0.33517,0.98234,0.46325),vec3(0.35043,0.98477,0.45002),vec3(0.36581,0.98702,0.43688),vec3(0.38127,0.98909,0.42386),vec3(0.39678,0.99098,0.41098),vec3(0.41229,0.99268,0.39826),vec3(0.42778,0.99419,0.38575),vec3(0.44321,0.99551,0.37345),vec3(0.45854,0.99663,0.36140),vec3(0.47375,0.99755,0.34963),vec3(0.48879,0.99828,0.33816),vec3(0.50362,0.99879,0.32701),vec3(0.51822,0.99910,0.31622),vec3(0.53255,0.99919,0.30581),vec3(0.54658,0.99907,0.29581),vec3(0.56026,0.99873,0.28623),vec3(0.57357,0.99817,0.27712),vec3(0.58646,0.99739,0.26849),vec3(0.59891,0.99638,0.26038),vec3(0.61088,0.99514,0.25280),vec3(0.62233,0.99366,0.24579),vec3(0.63323,0.99195,0.23937),vec3(0.64362,0.98999,0.23356),vec3(0.65394,0.98775,0.22835),vec3(0.66428,0.98524,0.22370),vec3(0.67462,0.98246,0.21960),vec3(0.68494,0.97941,0.21602),vec3(0.69525,0.97610,0.21294),vec3(0.70553,0.97255,0.21032),vec3(0.71577,0.96875,0.20815),vec3(0.72596,0.96470,0.20640),vec3(0.73610,0.96043,0.20504),vec3(0.74617,0.95593,0.20406),vec3(0.75617,0.95121,0.20343),vec3(0.76608,0.94627,0.20311),vec3(0.77591,0.94113,0.20310),vec3(0.78563,0.93579,0.20336),vec3(0.79524,0.93025,0.20386),vec3(0.80473,0.92452,0.20459),vec3(0.81410,0.91861,0.20552),vec3(0.82333,0.91253,0.20663),vec3(0.83241,0.90627,0.20788),vec3(0.84133,0.89986,0.20926),vec3(0.85010,0.89328,0.21074),vec3(0.85868,0.88655,0.21230),vec3(0.86709,0.87968,0.21391),vec3(0.87530,0.87267,0.21555),vec3(0.88331,0.86553,0.21719),vec3(0.89112,0.85826,0.21880),vec3(0.89870,0.85087,0.22038),vec3(0.90605,0.84337,0.22188),vec3(0.91317,0.83576,0.22328),vec3(0.92004,0.82806,0.22456),vec3(0.92666,0.82025,0.22570),vec3(0.93301,0.81236,0.22667),vec3(0.93909,0.80439,0.22744),vec3(0.94489,0.79634,0.22800),vec3(0.95039,0.78823,0.22831),vec3(0.95560,0.78005,0.22836),vec3(0.96049,0.77181,0.22811),vec3(0.96507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        varying vec3 vColor;
  void main(){
        int index = int(displacement);
			  vColor = vLut[index];
    vColor.x = (vColor.x*255.-49.)/206.;
    vColor.y = (vColor.y*255.-19.)/236.;
    vColor.z = (vColor.z*255.-50.)/190.;
    
        vec3 newPosition = position + normal*displacement/25.5;
        gl_Position = projectionMatrix * modelViewMatrix * vec4(newPosition,1.0);
  }
</script>
<script type="x-shader/x-fragment" id="fragmentshader">
  varying vec3 vColor;
  void main(){
    gl_FragColor = vec4(vColor,1.0);
  }
</script>
<div id ="Spectrogram"></div>
!

CSS 

              
                /* Remove overflow */
body{
  margin: 0px; background-color: #222222; overflow: hidden;
}
!

JS 

              
                //< (Edit: I had to load the LUT directly into the shader to get this to run on mobile in Codepen. No idea why, but that's why the code looks different.)
"use strict";
import * as THREE from 'https://threejsfundamentals.org/threejs/resources/threejs/r122/build/three.module.js';
// Initialize Scene parameters
let frequency_samples = 128; // Y resolution
let DATA = new Uint8Array(frequency_samples); // for later
let camera, scene, renderer;
let heights, mesh;
let time_samples = 200; // X resolution
let n_vertices = (frequency_samples+1) * (time_samples+1);
let xsegments = time_samples;
let ysegments = frequency_samples;
let xsize = 35; 
let ysize = 20;
let xhalfSize = xsize/2;
let yhalfSize = ysize / 2;
let xsegmentSize = xsize / xsegments; //Size of one square
let ysegmentSize = ysize / ysegments;

init();

function init() {
  // Place the camera in space
  camera = new THREE.PerspectiveCamera( 27, window.innerWidth / window.innerHeight, 1, 1000 );
  camera.position.z = 64;
  scene = new THREE.Scene();
  let geometry = new THREE.BufferGeometry();
  let indices = [];
  heights = [];
  let vertices = [];

  // generate vertices for a simple grid geometry
  for (let i = 0; i <= xsegments; i ++ ) {
    let x = ( i * xsegmentSize ) - xhalfSize; //midpoint of mesh is 0,0
    for ( let j = 0; j <= ysegments; j ++ ) {
      let y = (j * ysegmentSize) - yhalfSize;
      vertices.push( x, y, 0);
      heights.push(Math.random()*255); // for now our mesh is flat, so heights are zero
    }
  }
  // Add the position data to the geometry buffer
  geometry.setAttribute( 'position', new THREE.Float32BufferAttribute( vertices, 3 ) );

  // generate indices (data for element buffer). This says where each triangle goes
  // the code might look complex, but it is essentially the way you tile the plane with 
  // triangles. Each square segment has 4 vertices, a, b, c, d. Which make 2 triangles.
  // a  b
  // d  c
  // Looking above, we can make a triangle by connecting a b d
  // a-b
  // d
  // and similarly for b c d. These make the two faces of our mesh segment.

  for (let i = 0; i < xsegments; i ++ ) {
    for ( let j = 0; j < ysegments; j ++ ) {
      let a = i * ( ysegments + 1 ) + ( j + 1 );
      let b = i * ( ysegments + 1 ) + j;
      let c = ( i + 1 ) * ( ysegments + 1 ) + j;
      let d = ( i + 1 ) * ( ysegments + 1 ) + ( j + 1 );
      // generate two faces (triangles) per iteration
      indices.push( a, b, d ); // face one
      indices.push( b, c, d ); // face two
    }
  }
  geometry.setIndex( indices );
  // This bit of code defines a lookup table (LUT) for our colors. 
  // Right now we are only providing one color in this "string" value below (Red).
  // This will be useful later on when we want a variety of colors to work with
  // We will just add colors to this string and send them to the shader

  //Grab the shaders from the document
  var vShader = document.getElementById('vertexshader');
  var fShader = document.getElementById('fragmentshader');
  // Define the uniforms. V3V gives us a 3vector for RGB
  
  // Bind the shaders and uniforms to the material
  let material = new THREE.ShaderMaterial( {
      vertexShader:   vShader.text,
      fragmentShader: fShader.text
  } );

  // Initialize the renderer and connect it to the DIV
  renderer = new THREE.WebGLRenderer( { antialias: true } );
  renderer.setPixelRatio( window.devicePixelRatio );
  renderer.setSize( window.innerWidth, window.innerHeight );
  let container = document.getElementById( 'Spectrogram' );
  container.appendChild( renderer.domElement );

  // Give the mesh a material with color (Purple)
  mesh = new THREE.Mesh( geometry, material );
  scene.add( mesh );
  geometry.setAttribute('displacement', new THREE.Uint8BufferAttribute(heights,1));
  mesh.geometry.computeFaceNormals();
  mesh.geometry.computeVertexNormals();
  // Render the scene!
  renderer.render(scene, camera);
}
!
999px

Console