noise – ページ 360 – プログラミング de 落描き

2018年10月5日2018年10月5日

Noisy Circles. openFrameworks

[ Video ]

[ About ]
ノイズで不完全な円を作成。たまにココイチのロゴっぽくなる所がハイライト

Cleated incomplate circles by Perlin Noise.

[ Source ]

#pragma once
#include "ofMain.h"

class ofApp : public ofBaseApp {

public:
	void setup();
	void update();
	void draw();

	void keyPressed(int key) {};
	void keyReleased(int key) {};
	void mouseMoved(int x, int y) {};
	void mouseDragged(int x, int y, int button) {};
	void mousePressed(int x, int y, int button) {};
	void mouseReleased(int x, int y, int button) {};
	void mouseEntered(int x, int y) {};
	void mouseExited(int x, int y) {};
	void windowResized(int w, int h) {};
	void dragEvent(ofDragInfo dragInfo) {};
	void gotMessage(ofMessage msg) {};
};

#pragma once

#include "ofMain.h"

class ofApp : public ofBaseApp {

public:

void setup();

void update();

void draw();

void keyPressed(int key) {};

void keyReleased(int key) {};

void mouseMoved(int x, int y) {};

void mouseDragged(int x, int y, int button) {};

void mousePressed(int x, int y, int button) {};

void mouseReleased(int x, int y, int button) {};

void mouseEntered(int x, int y) {};

void mouseExited(int x, int y) {};

void windowResized(int w, int h) {};

void dragEvent(ofDragInfo dragInfo) {};

void gotMessage(ofMessage msg) {};

};

#include "ofApp.h"

//--------------------------------------------------------------
void ofApp::setup() {

	ofSetFrameRate(60);
	ofSetWindowTitle("openframeworks");

	ofBackground(239);
	ofSetLineWidth(2);
	ofSetColor(39);
}

//--------------------------------------------------------------
void ofApp::update() {

	ofSeedRandom(39);
}

//--------------------------------------------------------------
void ofApp::draw() {

	int radius = 36;
	for (int x = radius; x < ofGetHeight(); x += radius * 2) {

		for (int y = radius; y < ofGetHeight(); y += radius * 2) {

			ofPushMatrix();
			ofTranslate(x, y);

			int deg_start = ofMap(ofNoise(x * 0.05, ofGetFrameNum() * 0.005), 0, 1, 0, 720);
			int deg_end = ofMap(ofNoise((y + radius) * 0.05, ofGetFrameNum() * 0.005), 0, 1, 0, 720);
			if (deg_start > deg_end) { std::swap(deg_start, deg_end); }

			ofFill();
			ofBeginShape();
			for (int deg = deg_start; deg < deg_end; deg += 5) {

				ofVertex(radius * 0.85 * cos(deg * DEG_TO_RAD), radius * 0.85 * sin(deg * DEG_TO_RAD));
			}
			if (deg_end - deg_start < 180) { ofVertex(0, 0); }
			ofEndShape(true);

			ofNoFill();
			ofBeginShape();
			for (int deg = 0; deg < 360; deg += 5) {

				ofVertex(radius * 0.95 * cos(deg * DEG_TO_RAD), radius * 0.95 * sin(deg * DEG_TO_RAD));
			}
			ofEndShape(true);

			ofPopMatrix();
		}
	}
}

//--------------------------------------------------------------
int main() {

	ofSetupOpenGL(720, 720, OF_WINDOW);
	ofRunApp(new ofApp());
}

#include "ofApp.h"

//--------------------------------------------------------------

void ofApp::setup() {

ofSetFrameRate(60);

ofSetWindowTitle("openframeworks");

ofBackground(239);

ofSetLineWidth(2);

ofSetColor(39);

}

//--------------------------------------------------------------

void ofApp::update() {

ofSeedRandom(39);

}

//--------------------------------------------------------------

void ofApp::draw() {

int radius = 36;

for (int x = radius; x < ofGetHeight(); x += radius * 2) {

for (int y = radius; y < ofGetHeight(); y += radius * 2) {

ofPushMatrix();

ofTranslate(x, y);

int deg_start = ofMap(ofNoise(x * 0.05, ofGetFrameNum() * 0.005), 0, 1, 0, 720);

int deg_end = ofMap(ofNoise((y + radius) * 0.05, ofGetFrameNum() * 0.005), 0, 1, 0, 720);

if (deg_start > deg_end) { std::swap(deg_start, deg_end); }

ofFill();

ofBeginShape();

for (int deg = deg_start; deg < deg_end; deg += 5) {

ofVertex(radius * 0.85 * cos(deg * DEG_TO_RAD), radius * 0.85 * sin(deg * DEG_TO_RAD));

}

if (deg_end - deg_start < 180) { ofVertex(0, 0); }

ofEndShape(true);

ofNoFill();

ofBeginShape();

for (int deg = 0; deg < 360; deg += 5) {

ofVertex(radius * 0.95 * cos(deg * DEG_TO_RAD), radius * 0.95 * sin(deg * DEG_TO_RAD));

}

ofEndShape(true);

ofPopMatrix();

}

//--------------------------------------------------------------

int main() {

ofSetupOpenGL(720, 720, OF_WINDOW);

ofRunApp(new ofApp());

}

[ Link ]
https://github.com/junkiyoshi/Insta20181005

2018年10月2日2018年10月2日

Noisy Torus. openFrameworks

[ Video ]

[ About ]
トーラスをパーリンノイズでバラバラに

Torus is split by Perlin noise.

[ Source ]

#pragma once
#include "ofMain.h"

class ofApp : public ofBaseApp {

public:
	void setup();
	void update();
	void draw();

	void keyPressed(int key) {};
	void keyReleased(int key) {};
	void mouseMoved(int x, int y) {};
	void mouseDragged(int x, int y, int button) {};
	void mousePressed(int x, int y, int button) {};
	void mouseReleased(int x, int y, int button) {};
	void mouseEntered(int x, int y) {};
	void mouseExited(int x, int y) {};
	void windowResized(int w, int h) {};
	void dragEvent(ofDragInfo dragInfo) {};
	void gotMessage(ofMessage msg) {};

	ofPoint make_point(float radius, float deg, float small_radius, float small_deg);

	ofEasyCam cam;
};

#pragma once

#include "ofMain.h"

class ofApp : public ofBaseApp {

public:

void setup();

void update();

void draw();

void keyPressed(int key) {};

void keyReleased(int key) {};

void mouseMoved(int x, int y) {};

void mouseDragged(int x, int y, int button) {};

void mousePressed(int x, int y, int button) {};

void mouseReleased(int x, int y, int button) {};

void mouseEntered(int x, int y) {};

void mouseExited(int x, int y) {};

void windowResized(int w, int h) {};

void dragEvent(ofDragInfo dragInfo) {};

void gotMessage(ofMessage msg) {};

ofPoint make_point(float radius, float deg, float small_radius, float small_deg);

ofEasyCam cam;

};

#include "ofApp.h"

//--------------------------------------------------------------
void ofApp::setup() {

	ofSetFrameRate(60);
	ofSetWindowTitle("openframeworks");

	ofBackground(239);
	ofSetColor(39);
	ofEnableDepthTest();

}
//--------------------------------------------------------------
void ofApp::update() {

}

//--------------------------------------------------------------
void ofApp::draw() {

	this->cam.begin();
	ofRotateY(ofGetFrameNum());

	float radius = 300.f;
	float small_radius = 80.f;
	float deg_span = 10.f;
	float small_deg_span = 30.f;

	for (int deg = 0; deg < 360; deg += deg_span) {

		for (int small_deg = 0; small_deg < 360; small_deg += small_deg_span) {

			float noise_value = ofNoise(deg * 0.05, small_deg * 0.05, ofGetFrameNum() * 0.005);
			float tmp_small_radius = small_radius * noise_value;

			ofSetColor(255 - noise_value * 255);

			ofBeginShape();

			ofVertex(this->make_point(radius, deg, tmp_small_radius, small_deg));
			ofVertex(this->make_point(radius, deg + deg_span, tmp_small_radius, small_deg));
			ofVertex(this->make_point(radius, deg + deg_span, tmp_small_radius, small_deg + small_deg_span));
			ofVertex(this->make_point(radius, deg, tmp_small_radius, small_deg + small_deg_span));

			ofEndShape(true);
		}
	}


	this->cam.end();
}

//--------------------------------------------------------------
ofPoint ofApp::make_point(float radius, float deg, float small_radius, float small_deg) {

	float x_1 = radius * cos(deg * DEG_TO_RAD);
	float y_1 = radius * sin(deg * DEG_TO_RAD);

	float x_2 = small_radius * cos(small_deg * DEG_TO_RAD) * cos(deg * DEG_TO_RAD);
	float y_2 = small_radius * cos(small_deg * DEG_TO_RAD) * sin(deg * DEG_TO_RAD);

	float x = x_1 + x_2;
	float y = y_1 + y_2;
	float z = small_radius * sin(small_deg * DEG_TO_RAD);

	return ofPoint(x, y, z);
}

//--------------------------------------------------------------
int main() {

	ofSetupOpenGL(720, 720, OF_WINDOW);
	ofRunApp(new ofApp());
}

#include "ofApp.h"

//--------------------------------------------------------------

void ofApp::setup() {

ofSetFrameRate(60);

ofSetWindowTitle("openframeworks");

ofBackground(239);

ofSetColor(39);

ofEnableDepthTest();

}

//--------------------------------------------------------------

void ofApp::update() {

}

//--------------------------------------------------------------

void ofApp::draw() {

this->cam.begin();

ofRotateY(ofGetFrameNum());

float radius = 300.f;

float small_radius = 80.f;

float deg_span = 10.f;

float small_deg_span = 30.f;

for (int deg = 0; deg < 360; deg += deg_span) {

for (int small_deg = 0; small_deg < 360; small_deg += small_deg_span) {

float noise_value = ofNoise(deg * 0.05, small_deg * 0.05, ofGetFrameNum() * 0.005);

float tmp_small_radius = small_radius * noise_value;

ofSetColor(255 - noise_value * 255);

ofBeginShape();

ofVertex(this->make_point(radius, deg, tmp_small_radius, small_deg));

ofVertex(this->make_point(radius, deg + deg_span, tmp_small_radius, small_deg));

ofVertex(this->make_point(radius, deg + deg_span, tmp_small_radius, small_deg + small_deg_span));

ofVertex(this->make_point(radius, deg, tmp_small_radius, small_deg + small_deg_span));

ofEndShape(true);

}

this->cam.end();

}

//--------------------------------------------------------------

ofPoint ofApp::make_point(float radius, float deg, float small_radius, float small_deg) {

float x_1 = radius * cos(deg * DEG_TO_RAD);

float y_1 = radius * sin(deg * DEG_TO_RAD);

float x_2 = small_radius * cos(small_deg * DEG_TO_RAD) * cos(deg * DEG_TO_RAD);

float y_2 = small_radius * cos(small_deg * DEG_TO_RAD) * sin(deg * DEG_TO_RAD);

float x = x_1 + x_2;

float y = y_1 + y_2;

float z = small_radius * sin(small_deg * DEG_TO_RAD);

return ofPoint(x, y, z);

}

//--------------------------------------------------------------

int main() {

ofSetupOpenGL(720, 720, OF_WINDOW);

ofRunApp(new ofApp());

}

[ Link ]
https://github.com/junkiyoshi/Insta20181002

2018年9月28日2018年9月28日

Light rings. openFrameworks

[ Video ]

[ About ]
光る輪の半径をNoise(FrameNum + RingNumber)で変化させる

Radius of light ring changed by Noise(FrameNumber + RingNumber).

[ Source ]

pragma once
#include "ofMain.h"

class ofApp : public ofBaseApp {

public:
	void setup();
	void update();
	void draw();

	void keyPressed(int key) {};
	void keyReleased(int key) {};
	void mouseMoved(int x, int y) {};
	void mouseDragged(int x, int y, int button) {};
	void mousePressed(int x, int y, int button) {};
	void mouseReleased(int x, int y, int button) {};
	void mouseEntered(int x, int y) {};
	void mouseExited(int x, int y) {};
	void windowResized(int w, int h) {};
	void dragEvent(ofDragInfo dragInfo) {};
	void gotMessage(ofMessage msg) {};

	ofShader shader;
};

pragma once

#include "ofMain.h"

class ofApp : public ofBaseApp {

public:

void setup();

void update();

void draw();

void keyPressed(int key) {};

void keyReleased(int key) {};

void mouseMoved(int x, int y) {};

void mouseDragged(int x, int y, int button) {};

void mousePressed(int x, int y, int button) {};

void mouseReleased(int x, int y, int button) {};

void mouseEntered(int x, int y) {};

void mouseExited(int x, int y) {};

void windowResized(int w, int h) {};

void dragEvent(ofDragInfo dragInfo) {};

void gotMessage(ofMessage msg) {};

ofShader shader;

};

#include "ofApp.h"

//--------------------------------------------------------------
void ofApp::setup() {

	ofSetFrameRate(60);
	ofSetWindowTitle("openframeworks");

	this->shader.load("shader/shader.vert", "shader/shader.frag");
}

//--------------------------------------------------------------
void ofApp::update() {

}

//--------------------------------------------------------------
void ofApp::draw() {

	this->shader.begin();
	this->shader.setUniform1f("time", ofGetElapsedTimef());
	this->shader.setUniform2f("resolution", ofGetWidth(), ofGetHeight());

	ofDrawRectangle(0, 0, ofGetWidth(), ofGetHeight());

	this->shader.end();

}

//--------------------------------------------------------------
int main() {

	ofGLWindowSettings settings;
	settings.setGLVersion(3, 2);
	settings.setSize(720, 720);
	ofCreateWindow(settings);
	ofRunApp(new ofApp());
}

#include "ofApp.h"

//--------------------------------------------------------------

void ofApp::setup() {

ofSetFrameRate(60);

ofSetWindowTitle("openframeworks");

this->shader.load("shader/shader.vert", "shader/shader.frag");

}

//--------------------------------------------------------------

void ofApp::update() {

}

//--------------------------------------------------------------

void ofApp::draw() {

this->shader.begin();

this->shader.setUniform1f("time", ofGetElapsedTimef());

this->shader.setUniform2f("resolution", ofGetWidth(), ofGetHeight());

ofDrawRectangle(0, 0, ofGetWidth(), ofGetHeight());

this->shader.end();

}

//--------------------------------------------------------------

int main() {

ofGLWindowSettings settings;

settings.setGLVersion(3, 2);

settings.setSize(720, 720);

ofCreateWindow(settings);

ofRunApp(new ofApp());

}

#version 150

uniform mat4 modelViewProjectionMatrix;
in vec4 position;

void main(){
	gl_Position = modelViewProjectionMatrix * position;
}

#version 150

uniform mat4 modelViewProjectionMatrix;

in vec4 position;

void main(){

gl_Position = modelViewProjectionMatrix * position;

}

#version 150

uniform float time;
uniform vec2 resolution;

out vec4 outputColor;

//
// Description : Array and textureless GLSL 2D/3D/4D simplex
//               noise functions.
//      Author : Ian McEwan, Ashima Arts.
//  Maintainer : stegu
//     Lastmod : 20110822 (ijm)
//     License : Copyright (C) 2011 Ashima Arts. All rights reserved.
//               Distributed under the MIT License. See LICENSE file.
//               https://github.com/ashima/webgl-noise
//               https://github.com/stegu/webgl-noise
//

vec4 mod289(vec4 x) {
  return x - floor(x * (1.0 / 289.0)) * 289.0; }

float mod289(float x) {
  return x - floor(x * (1.0 / 289.0)) * 289.0; }

vec4 permute(vec4 x) {
     return mod289(((x*34.0)+1.0)*x);
}

float permute(float x) {
     return mod289(((x*34.0)+1.0)*x);
}

vec4 taylorInvSqrt(vec4 r)
{
  return 1.79284291400159 - 0.85373472095314 * r;
}

float taylorInvSqrt(float r)
{
  return 1.79284291400159 - 0.85373472095314 * r;
}

vec4 grad4(float j, vec4 ip)
  {
  const vec4 ones = vec4(1.0, 1.0, 1.0, -1.0);
  vec4 p,s;

  p.xyz = floor( fract (vec3(j) * ip.xyz) * 7.0) * ip.z - 1.0;
  p.w = 1.5 - dot(abs(p.xyz), ones.xyz);
  s = vec4(lessThan(p, vec4(0.0)));
  p.xyz = p.xyz + (s.xyz*2.0 - 1.0) * s.www;

  return p;
  }

// (sqrt(5) - 1)/4 = F4, used once below
#define F4 0.309016994374947451

float snoise(vec4 v)
  {
  const vec4  C = vec4( 0.138196601125011,  // (5 - sqrt(5))/20  G4
                        0.276393202250021,  // 2 * G4
                        0.414589803375032,  // 3 * G4
                       -0.447213595499958); // -1 + 4 * G4

// First corner
  vec4 i  = floor(v + dot(v, vec4(F4)) );
  vec4 x0 = v -   i + dot(i, C.xxxx);

// Other corners

// Rank sorting originally contributed by Bill Licea-Kane, AMD (formerly ATI)
  vec4 i0;
  vec3 isX = step( x0.yzw, x0.xxx );
  vec3 isYZ = step( x0.zww, x0.yyz );
//  i0.x = dot( isX, vec3( 1.0 ) );
  i0.x = isX.x + isX.y + isX.z;
  i0.yzw = 1.0 - isX;
//  i0.y += dot( isYZ.xy, vec2( 1.0 ) );
  i0.y += isYZ.x + isYZ.y;
  i0.zw += 1.0 - isYZ.xy;
  i0.z += isYZ.z;
  i0.w += 1.0 - isYZ.z;

  // i0 now contains the unique values 0,1,2,3 in each channel
  vec4 i3 = clamp( i0, 0.0, 1.0 );
  vec4 i2 = clamp( i0-1.0, 0.0, 1.0 );
  vec4 i1 = clamp( i0-2.0, 0.0, 1.0 );

  //  x0 = x0 - 0.0 + 0.0 * C.xxxx
  //  x1 = x0 - i1  + 1.0 * C.xxxx
  //  x2 = x0 - i2  + 2.0 * C.xxxx
  //  x3 = x0 - i3  + 3.0 * C.xxxx
  //  x4 = x0 - 1.0 + 4.0 * C.xxxx
  vec4 x1 = x0 - i1 + C.xxxx;
  vec4 x2 = x0 - i2 + C.yyyy;
  vec4 x3 = x0 - i3 + C.zzzz;
  vec4 x4 = x0 + C.wwww;

// Permutations
  i = mod289(i);
  float j0 = permute( permute( permute( permute(i.w) + i.z) + i.y) + i.x);
  vec4 j1 = permute( permute( permute( permute (
             i.w + vec4(i1.w, i2.w, i3.w, 1.0 ))
           + i.z + vec4(i1.z, i2.z, i3.z, 1.0 ))
           + i.y + vec4(i1.y, i2.y, i3.y, 1.0 ))
           + i.x + vec4(i1.x, i2.x, i3.x, 1.0 ));

// Gradients: 7x7x6 points over a cube, mapped onto a 4-cross polytope
// 7*7*6 = 294, which is close to the ring size 17*17 = 289.
  vec4 ip = vec4(1.0/294.0, 1.0/49.0, 1.0/7.0, 0.0) ;

  vec4 p0 = grad4(j0,   ip);
  vec4 p1 = grad4(j1.x, ip);
  vec4 p2 = grad4(j1.y, ip);
  vec4 p3 = grad4(j1.z, ip);
  vec4 p4 = grad4(j1.w, ip);

// 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;
  p4 *= taylorInvSqrt(dot(p4,p4));

// Mix contributions from the five corners
  vec3 m0 = max(0.6 - vec3(dot(x0,x0), dot(x1,x1), dot(x2,x2)), 0.0);
  vec2 m1 = max(0.6 - vec2(dot(x3,x3), dot(x4,x4)            ), 0.0);
  m0 = m0 * m0;
  m1 = m1 * m1;
  return 49.0 * ( dot(m0*m0, vec3( dot( p0, x0 ), dot( p1, x1 ), dot( p2, x2 )))
               + dot(m1*m1, vec2( dot( p3, x3 ), dot( p4, x4 ) ) ) ) ;
}

void main() {

  vec2 p = (gl_FragCoord.xy * 2.0 - resolution) / min(resolution.x, resolution.y);
  vec3 color = vec3(0.0);

  for(float i = 0.0; i < 1.0; i += 0.2){

    float n = snoise(vec4(time * 0.5 + i * 0.2, 1.0, 1.0, 1.0));
    n = (n + 1) * 0.5;    
    float v = 0.002 / abs(n - length(p));
    color += vec3(v);
  }

  outputColor = vec4(color, 1.0);
}

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#version 150

uniform float time;

uniform vec2 resolution;

out vec4 outputColor;

// Description : Array and textureless GLSL 2D/3D/4D simplex

// noise functions.

// Author : Ian McEwan, Ashima Arts.

// Maintainer : stegu

// Lastmod : 20110822 (ijm)

// Distributed under the MIT License. See LICENSE file.

// https://github.com/ashima/webgl-noise

// https://github.com/stegu/webgl-noise

vec4 mod289(vec4 x) {

return x - floor(x * (1.0 / 289.0)) * 289.0; }

float mod289(float x) {

return x - floor(x * (1.0 / 289.0)) * 289.0; }

vec4 permute(vec4 x) {

return mod289(((x*34.0)+1.0)*x);

}

float permute(float x) {

return mod289(((x*34.0)+1.0)*x);

}

vec4 taylorInvSqrt(vec4 r)

{

return 1.79284291400159 - 0.85373472095314 * r;

}

float taylorInvSqrt(float r)

{

return 1.79284291400159 - 0.85373472095314 * r;

}

vec4 grad4(float j, vec4 ip)

{

const vec4 ones = vec4(1.0, 1.0, 1.0, -1.0);

vec4 p,s;

p.xyz = floor( fract (vec3(j) * ip.xyz) * 7.0) * ip.z - 1.0;

p.w = 1.5 - dot(abs(p.xyz), ones.xyz);

s = vec4(lessThan(p, vec4(0.0)));

p.xyz = p.xyz + (s.xyz*2.0 - 1.0) * s.www;

return p;

}

// (sqrt(5) - 1)/4 = F4, used once below

#define F4 0.309016994374947451

float snoise(vec4 v)

{

const vec4 C = vec4( 0.138196601125011, // (5 - sqrt(5))/20 G4

0.276393202250021, // 2 * G4

0.414589803375032, // 3 * G4

-0.447213595499958); // -1 + 4 * G4

// First corner

vec4 i = floor(v + dot(v, vec4(F4)) );

vec4 x0 = v - i + dot(i, C.xxxx);

// Other corners

// Rank sorting originally contributed by Bill Licea-Kane, AMD (formerly ATI)

vec4 i0;

vec3 isX = step( x0.yzw, x0.xxx );

vec3 isYZ = step( x0.zww, x0.yyz );

// i0.x = dot( isX, vec3( 1.0 ) );

i0.x = isX.x + isX.y + isX.z;

i0.yzw = 1.0 - isX;

// i0.y += dot( isYZ.xy, vec2( 1.0 ) );

i0.y += isYZ.x + isYZ.y;

i0.zw += 1.0 - isYZ.xy;

i0.z += isYZ.z;

i0.w += 1.0 - isYZ.z;

// i0 now contains the unique values 0,1,2,3 in each channel

vec4 i3 = clamp( i0, 0.0, 1.0 );

vec4 i2 = clamp( i0-1.0, 0.0, 1.0 );

vec4 i1 = clamp( i0-2.0, 0.0, 1.0 );

// x0 = x0 - 0.0 + 0.0 * C.xxxx

// x1 = x0 - i1 + 1.0 * C.xxxx

// x2 = x0 - i2 + 2.0 * C.xxxx

// x3 = x0 - i3 + 3.0 * C.xxxx

// x4 = x0 - 1.0 + 4.0 * C.xxxx

vec4 x1 = x0 - i1 + C.xxxx;

vec4 x2 = x0 - i2 + C.yyyy;

vec4 x3 = x0 - i3 + C.zzzz;

vec4 x4 = x0 + C.wwww;

// Permutations

i = mod289(i);

float j0 = permute( permute( permute( permute(i.w) + i.z) + i.y) + i.x);

vec4 j1 = permute( permute( permute( permute (

i.w + vec4(i1.w, i2.w, i3.w, 1.0 ))

+ i.z + vec4(i1.z, i2.z, i3.z, 1.0 ))

+ i.y + vec4(i1.y, i2.y, i3.y, 1.0 ))

+ i.x + vec4(i1.x, i2.x, i3.x, 1.0 ));

// Gradients: 7x7x6 points over a cube, mapped onto a 4-cross polytope

// 7*7*6 = 294, which is close to the ring size 17*17 = 289.

vec4 ip = vec4(1.0/294.0, 1.0/49.0, 1.0/7.0, 0.0) ;

vec4 p0 = grad4(j0, ip);

vec4 p1 = grad4(j1.x, ip);

vec4 p2 = grad4(j1.y, ip);

vec4 p3 = grad4(j1.z, ip);

vec4 p4 = grad4(j1.w, ip);

// 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;

p4 *= taylorInvSqrt(dot(p4,p4));

// Mix contributions from the five corners

vec3 m0 = max(0.6 - vec3(dot(x0,x0), dot(x1,x1), dot(x2,x2)), 0.0);

vec2 m1 = max(0.6 - vec2(dot(x3,x3), dot(x4,x4) ), 0.0);

m0 = m0 * m0;

m1 = m1 * m1;

return 49.0 * ( dot(m0*m0, vec3( dot( p0, x0 ), dot( p1, x1 ), dot( p2, x2 )))

+ dot(m1*m1, vec2( dot( p3, x3 ), dot( p4, x4 ) ) ) ) ;

}

void main() {

vec2 p = (gl_FragCoord.xy * 2.0 - resolution) / min(resolution.x, resolution.y);

vec3 color = vec3(0.0);

for(float i = 0.0; i < 1.0; i += 0.2){

float n = snoise(vec4(time * 0.5 + i * 0.2, 1.0, 1.0, 1.0));

n = (n + 1) * 0.5;

float v = 0.002 / abs(n - length(p));

color += vec3(v);

}

outputColor = vec4(color, 1.0);

}

[ Link ]
https://github.com/junkiyoshi/Insta20180928

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