10.6

Mandelbrot zoom (Composition by psonice)

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Just a simple mandelbrot - got bored and made it during lunch. Use arrow keys to move around, W/S to zoom in/out.

It's a simple comp too. Just a glsl shader drawing the fractal, and a few integrators + math patches to handle movement and zoom. The zoom was the tricky part actually, getting movement speed relative to zoom level, and zoom speed to be exponential (I used feedback in the end).

There's a RII patch that generates the palette, so mess about with that to change the colours (there's no reason to limit it to 256 colours really, just change the width and change the fragment shader from "mod(i, 255.)" to however many colours you want.

OpenCV Contours & Convex Hull 2 Structure plugin [DEPRECATED] (Composition by benoitlahoz)

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[EDIT 20120124 - UPDATED - please see this post now : http://kineme.net/composition/benoitlahoz/BlobTrackingPluginCarasueloOpenCV002a]

My first OpenCV plugin : it gets the contours and convex hulls present in the input image and output a structure of lines structure.

Very-alpha-version : it doesn't support for the moment a difference between the image size and the renderer size, but I'm working on it.

(BTW : i'm looking for a way to get the renderer size in pixels inside of my program... if someone knows how to do this :-/)

I didn't use the Canny filter which slows a lot the comp. I would be interested to know the performance on others machine than mine.

TODO :

• Track blobs [EDIT : done in the new plugin, see below]
• Delaunay Triangulation
• Output Image (arghhh)
• ...

Thanks to Mirek OpenCV plugin that helped me to understand how to convert the input image to OpenCV. Thanks to Mehmet for the threshold CIKernel.

Works in 32/64 bits

Dither Circles (Composition by gtoledo3)

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I was looking at Toneburst's port of a webGL crosshatch shader, and I thought the idea of writing different fragment colors and maybe shapes, depending on luminance, was really interesting.

I setup this shader to draw circles that are dependent on luminosity from depth channel.

For four steps of depth, you can control the inner/outer color of the circle, control the interpolation between inner and outer color, void out an area in the middle of the circle (or make it bigger than the outer circle radius, to draw a "smaller" dot than the main circle size).

I don't know if it's really appropriate to call it a dither shader at this point, but I did start with the the crosshatch mono - I deleted all of the "if" stuff after each luminance step, and inserted the code to draw the circles, which was based on this example @ http://people.freedesktop.org/~idr/OpenGL_tutorials/03-fragment-intro.html

The "inner circle" discards kind of "build up" in steps. So, if the first Circ_Inner has a value, all of the subsequent ones will have holes too - you can "add" in bigger holes, or change inner/outer values to kind of tweak around that. It was easier than setting up more conditional statements, and this was just a fun endeavor anyway. :-)

Voronoi Shader (Interactive - reworked from p_g) (Composition by gtoledo3)

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I was reading:

http://edotprintstacktrace.blogspot.com/search?updated-max=2011-02-01T12...

...and there was a really interesting shader, and video. The video showcased four interactive areas, making a voronoi, totally with a pixel shader, and I thought it was pretty cool.

The showcased code only had it setup for three areas, and there was no real setup / qtz, etc., so it was a bit of a fun challenge to add in the extra yellow area to do what it was doing in the video.

Pulse Multitouch (originally by Danguafer/Silexars, ported to work with Multitouch) (Composition by gtoledo3)

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This is Pulse by Danguafer/Silexars(2010) from the ShaderToy collection, changed to work with multitouch.

The original fragment code is below:

//Pulse by Danguafer/Silexars(2010)
uniform float time;
uniform vec2 resolution;
uniform vec4 mouse;
uniform sampler2D tex0;
 
void main(void)
{
    vec2 halfres = resolution.xy/2.0;
    vec2 cPos = gl_FragCoord.xy;
 
    cPos.x -= 0.5*halfres.x*sin(time/2.0)+0.3*halfres.x*cos(time)+halfres.x;
    cPos.y -= 0.4*halfres.y*sin(time/5.0)+0.3*halfres.y*cos(time)+halfres.y;
    float cLength = length(cPos);
 
    vec2 uv = (gl_FragCoord.xy/resolution.xy+(cPos/cLength)*sin(cLength/30.0-time*10.0)/25.0);
    vec3 col = texture2D(tex0,uv).xyz*50.0/cLength;
 
    gl_FragColor = vec4(col,1.0);
}