: Program for image kaleidoscope/mirror effect similar to Adobe Capture Pattern Trap I've been looking for a program to do some graphic design work with that is similar to Adobe Capture Pattern

@Si6392903

Here is a simple GLSL shader that generates a similar effect as the MirrorMe Plugin:

precision mediump float;
varying vec2 tc; // texture coordinate of the output image in range [0.0, 1.0]
uniform sampler2D inputImage;
const float PI = 3.14159265359;
uniform int numberOfAxis; // description "The number of splitting axis" defaultval="8"

int intModulo(float a,float b) {
float m = mod(a, b);
return int(m+0.5);
}

void main() {
if(numberOfAxis <=0) {
gl_FragColor = texture2D(inputImage, tc);
}else{

float angleFrac = (2.0 * PI) / float(2 * numberOfAxis);

vec2 c = tc - 0.5; //map to range [-0.5, 0.5]

// convert to polar coordinates
float phi = abs(atan(c.y, c.x));
float r = length(c);

int count = int(phi / angleFrac);

phi = mod(phi, angleFrac);
if( intModulo(float(count),2.0) == 1) {
phi = angleFrac - phi;
}

//from polar coordinates
float x = r * cos(phi);
float y = r * sin(phi);

vec2 cc = vec2(x,y) + 0.5; //map to range [0.0, 1.0]
vec4 color = texture2D(inputImage, cc);
gl_FragColor = color;
}
}


This is the output for 0, 2, and 8 splitting axis:


The GSN Composer is an online node-based image editor that allows running such custom GLSL code on jpg or png images. Here is the link for the example above:
www.gsn-lib.org/index.html#projectName=forummirror&graphName=Mirror
I have tested it with a resolution of up to 8000 x 8000 pixels on my machine. However, I assume the supported image size depends on your graphics card.

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