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distance = speed * time

speed = distance/time

time = distance/speed

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var cameraZ = camera.position.z;
var planeZ = 5;
var distance = cameraZ - planeZ;
var aspect = viewWidth / viewHeight;
var vFov = camera.fov * Math.PI / 180;
var planeHeightAtDistance = 2 * Math.tan(vFov / 2) * distance;
var planeWidthAtDistance = planeHeightAtDistance * aspect;

// or

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html, body {
  height: 100%;
  margin: 0;
}
#c {
  width: 100%;
  height: 100%;
  display: block;
}

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var rad = function(x) {
  return x * Math.PI / 180;
};

var getDistance = function(p1, p2) {
  var R = 6378137; // Earth’s mean radius in meter
  var dLat = rad(p2.lat() - p1.lat());
  var dLong = rad(p2.lng() - p1.lng());
  var a = Math.sin(dLat / 2) * Math.sin(dLat / 2) +
    Math.cos(rad(p1.lat())) * Math.cos(rad(p2.lat())) *

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<meta property="og:type" content="video.other"/>
<meta property="og:title" content="Title"/>
<meta property="og:url" content="name.gif"/>
<meta property="og:image" content="name.gif"/>
<meta property="og:image:type" content="image/gif"/>

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var fragmentShader = `
precision mediump float;
uniform vec2      resolution;
uniform float     time;
uniform float     alpha;
uniform vec2      speed;
uniform float     shift;


float rand(vec2 n) {