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<!DOCTYPE html>
<html lang="en" >
<head>
<meta charset="UTF-8">
<title>Unavailable - Studieren ohne Grenzen</title>
<link rel="stylesheet" href="./style.css">
</head>
<body>
<html>
<body>
</body>
<div class="content">
<img height="150" src="./esfbird-color-on-transparent.png">
</br>
<h2>Ausgeflogen.</h2>
This service is currently unavailable due to technical issues.
</div>
<!-- shader for bird's position -->
<script id="fragmentShaderPosition" type="x-shader/x-fragment">
uniform float time;
uniform float delta;
void main() {
vec2 uv = gl_FragCoord.xy / resolution.xy;
vec4 tmpPos = texture2D( texturePosition, uv );
vec3 position = tmpPos.xyz;
vec3 velocity = texture2D( textureVelocity, uv ).xyz;
float phase = tmpPos.w;
phase = mod( ( phase + delta +
length( velocity.xz ) * delta * 3. +
max( velocity.y, 0.0 ) * delta * 6. ), 62.83 );
gl_FragColor = vec4( position + velocity * delta * 15. , phase );
}
</script>
<!-- shader for bird's velocity -->
<script id="fragmentShaderVelocity" type="x-shader/x-fragment">
uniform float time;
uniform float testing;
uniform float delta; // about 0.016
uniform float seperationDistance; // 20
uniform float alignmentDistance; // 40
uniform float cohesionDistance; //
uniform float freedomFactor;
uniform vec3 predator;
const float width = resolution.x;
const float height = resolution.y;
const float PI = 3.141592653589793;
const float PI_2 = PI * 2.0;
// const float VISION = PI * 0.55;
float zoneRadius = 40.0;
float zoneRadiusSquared = 1600.0;
float separationThresh = 0.45;
float alignmentThresh = 0.65;
const float UPPER_BOUNDS = BOUNDS;
const float LOWER_BOUNDS = -UPPER_BOUNDS;
const float SPEED_LIMIT = 9.0;
float rand(vec2 co){
return fract(sin(dot(co.xy ,vec2(12.9898,78.233))) * 43758.5453);
}
void main() {
zoneRadius = seperationDistance + alignmentDistance + cohesionDistance;
separationThresh = seperationDistance / zoneRadius;
alignmentThresh = ( seperationDistance + alignmentDistance ) / zoneRadius;
zoneRadiusSquared = zoneRadius * zoneRadius;
vec2 uv = gl_FragCoord.xy / resolution.xy;
vec3 birdPosition, birdVelocity;
vec3 selfPosition = texture2D( texturePosition, uv ).xyz;
vec3 selfVelocity = texture2D( textureVelocity, uv ).xyz;
float dist;
vec3 dir; // direction
float distSquared;
float seperationSquared = seperationDistance * seperationDistance;
float cohesionSquared = cohesionDistance * cohesionDistance;
float f;
float percent;
vec3 velocity = selfVelocity;
float limit = SPEED_LIMIT;
dir = predator * UPPER_BOUNDS - selfPosition;
dir.z = 0.;
// dir.z *= 0.6;
dist = length( dir );
distSquared = dist * dist;
float preyRadius = 150.0;
float preyRadiusSq = preyRadius * preyRadius;
// move birds away from predator
if (dist < preyRadius) {
f = ( distSquared / preyRadiusSq - 1.0 ) * delta * 100.;
velocity += normalize( dir ) * f;
limit += 5.0;
}
// if (testing == 0.0) {}
// if ( rand( uv + time ) < freedomFactor ) {}
// Attract flocks to the center
vec3 central = vec3( 0., 0., 0. );
dir = selfPosition - central;
dist = length( dir );
dir.y *= 2.5;
velocity -= normalize( dir ) * delta * 5.;
for (float y=0.0;y<height;y++) {
for (float x=0.0;x<width;x++) {
vec2 ref = vec2( x + 0.5, y + 0.5 ) / resolution.xy;
birdPosition = texture2D( texturePosition, ref ).xyz;
dir = birdPosition - selfPosition;
dist = length(dir);
if (dist < 0.0001) continue;
distSquared = dist * dist;
if (distSquared > zoneRadiusSquared ) continue;
percent = distSquared / zoneRadiusSquared;
if ( percent < separationThresh ) { // low
// Separation - Move apart for comfort
f = (separationThresh / percent - 1.0) * delta;
velocity -= normalize(dir) * f;
} else if ( percent < alignmentThresh ) { // high
// Alignment - fly the same direction
float threshDelta = alignmentThresh - separationThresh;
float adjustedPercent = ( percent - separationThresh ) / threshDelta;
birdVelocity = texture2D( textureVelocity, ref ).xyz;
f = ( 0.5 - cos( adjustedPercent * PI_2 ) * 0.5 + 0.5 ) * delta;
velocity += normalize(birdVelocity) * f;
} else {
// Attraction / Cohesion - move closer
float threshDelta = 1.0 - alignmentThresh;
float adjustedPercent = ( percent - alignmentThresh ) / threshDelta;
f = ( 0.5 - ( cos( adjustedPercent * PI_2 ) * -0.5 + 0.5 ) ) * delta;
velocity += normalize(dir) * f;
}
}
}
// this make tends to fly around than down or up
// if (velocity.y > 0.) velocity.y *= (1. - 0.2 * delta);
// Speed Limits
if ( length( velocity ) > limit ) {
velocity = normalize( velocity ) * limit;
}
gl_FragColor = vec4( velocity, 1.0 );
}
</script>
<script type="x-shader/x-vertex" id="birdVS">
attribute vec2 reference;
attribute float frameId;
uniform sampler2D texturePosition;
uniform sampler2D textureVelocity;
varying vec2 vUV;
varying mat2 vUVRot;
varying float vFrameId;
varying vec2 v_reference;
uniform float time;
void main() {
v_reference = reference;
vec3 pos = texture2D( texturePosition, reference ).xyz;
vec3 vel = normalize( texture2D( textureVelocity, reference ).xyz );
vec4 mvPos = modelViewMatrix * vec4( pos, 1.0 );
gl_PointSize = 20.0 * ( 800.0 / -mvPos.z );
vUV = vec2( vel.x * 0.5 + 0.5, vel.y * 0.5 + 0.5 );
vUV = floor( vUV * 11.0 ) / 11.0 + 0.5 / 11.0;
// TODO: better movement later
vUVRot = mat2( 1, 0, 0, 1 );
vFrameId = floor( mod( frameId + time * 0.5, 9.0 ) );
gl_Position = projectionMatrix * mvPos;
}
</script>
<!-- bird geometry shader -->
<script type="x-shader/x-fragment" id="birdFS">
uniform sampler2D texturesBird[ 9 ];
varying vec2 vUV;
varying mat2 vUVRot;
varying float vFrameId;
varying vec2 v_reference;
uniform vec3 color1;
uniform vec3 color2;
uniform vec3 color3;
void main() {
vec2 uv = 0.9 * vec2( 1.0 / 11.0 ) * ( gl_PointCoord - 0.5 ) * vUVRot + vUV;
int id = int( vFrameId );
vec4 col;
if ( id == 0 ) { col = texture2D( texturesBird[ 0 ], uv ); }
else if ( id == 1 ) { col = texture2D( texturesBird[ 1 ], uv ); }
else if ( id == 2 ) { col = texture2D( texturesBird[ 2 ], uv ); }
else if ( id == 3 ) { col = texture2D( texturesBird[ 3 ], uv ); }
else if ( id == 4 ) { col = texture2D( texturesBird[ 4 ], uv ); }
else if ( id == 5 ) { col = texture2D( texturesBird[ 5 ], uv ); }
else if ( id == 6 ) { col = texture2D( texturesBird[ 6 ], uv ); }
else if ( id == 7 ) { col = texture2D( texturesBird[ 7 ], uv ); }
else if ( id == 8 ) { col = texture2D( texturesBird[ 8 ], uv ); }
if (int(v_reference.x / 0.3) == 0) {
gl_FragColor = vec4(color1, col.a);
}else if (int(v_reference.x / 0.3) == 1) {
gl_FragColor = vec4(color2, col.a);
}else if (int(v_reference.x / 0.3) == 2) {
gl_FragColor = vec4(color3, col.a);
}
}
</script>
</html>
<script src='https://s3-us-west-2.amazonaws.com/s.cdpn.io/896175/three.min.js'></script>
<script src='https://s3-us-west-2.amazonaws.com/s.cdpn.io/896175/GPUComputationRenderer.js'></script>
<script src="./script.js"></script>
</body>
</html>