Carsten Høyer CarstenHoyer

    vec2 offSet[4];
 	offSet[0] = vec2(0.,0.);
    offSet[1] = vec2(0.,1.);
    offSet[2] = vec2(1.,0.);
    offSet[3] = vec2(1.,1.);

	vec3 zAxis = normalize( vNormal[0] );
    vec3 yAxis = vec3( 0.0, 1.0, 0.0 );
 vec3 xAxis = normalize( cross(zAxis, yAxis) );

Extracted from https://github.com/rpavlik/maya2osg/tree/master/src/GLSL

Vertex Shader

varying vec2 vTexCoord;
varying vec3 vNormal;
varying vec3 vEye;

void main() {

Please consider using http://lygia.xyz instead of copy/pasting this functions. It expand suport for voronoi, voronoise, fbm, noise, worley, noise, derivatives and much more, through simple file dependencies. Take a look to https://github.com/patriciogonzalezvivo/lygia/tree/main/generative

Generic 1,2,3 Noise

float rand(float n){return fract(sin(n) * 43758.5453123);}

float noise(float p){
	float fl = floor(p);
  float fc = fract(p);

RGB - YUB

mat3 yuv2rgb = mat3(1.0, 0.0, 1.28033, 1.0, -0.21482, -0.38059, 1.0, 2.12798, 0.0);
mat3 rgb2yuv = mat3(0.2126, 0.7152, 0.0722, -0.09991, -0.33609, 0.43600, 0.615, -0.5586, -0.05639);

RGB - HSV

Trigonometry

const float PI = 3.1415926535897932384626433832795;
const float PI_2 = 1.57079632679489661923;
const float PI_4 = 0.785398163397448309616;

float PHI = (1.0+sqrtf(5.0))/2.0;

Stringify Macro

#define STRINGIFY(A) #A

Default Vertex

string vertexShader = STRINGIFY(

Face by Face

void addFace(ofMesh& mesh, ofVec3f a, ofVec3f b, ofVec3f c) {
	ofVec3f normal = ((b - a).cross(c - a)).normalize();
	mesh.addNormal(normal);
	mesh.addVertex(a);
	mesh.addNormal(normal);
	mesh.addVertex(b);
	mesh.addNormal(normal);

	//Moebius transformations in 3d, by reverse stereographic projection to the 3-sphere,
	//rotation in 4d space, and projection back.
	//by Daniel Piker 09/08/20
	//Feel free to use, adapt and reshare. I'd appreciate a mention if you post something using this.
	//You can also now find this transformation as a component in Grasshopper/Rhino
	//I first wrote about these transformations here:
	//https://spacesymmetrystructure.wordpress.com/2008/12/11/4-dimensional-rotations/

	//If you want to transform about a given circle. Points on the circle and its axis stay on those curves.
	//You can skip these 2 lines if you want to always use the origin centred unit circle.

	string serialIn;

	unsigned char buffer[1];
	while( readBytes( buffer, 1) > 0){
	if (buffer[0] == '\n'){
	break;
	}
	serialIn.push_back(buffer[0]);
	};