lingdong- / ofxpoissonfill

Poisson filling shader for OpenFrameworks

ofxPoissonFill

Poisson filling shader for OpenFrameworks

• Uses GLSL shader
• Uses convolution pyramid algorithm
• Fast
• Header-only

Installation

Drop the folder into OF_ROOT/addons. Done!

Or even simpler, copy paste src/ofxPoissonFill.hpp directly to your own src folder.

Usage

PoissonFill pf;

ofTexture tex; 

// prepare your image here...

// allocate necessary datastructures (once)
pf.init(tex.getWidth(), tex.getHeight());

// process the image
pf.process(tex);

// draw processed image
pf.getTexture().draw(0,0);

See also example, API Documentation

Reference

• Convolution Pyramids, Farbman et al., 2011
• Rendu

Developed at Frank-Ratchye STUDIO for Creative Inquiry at Carnegie Mellon University.

ofxpoissonfill's Issues

does it work for non power of two texture sizes?

Thanks for this great addon!
I've noticed it sometimes cause an offset of the original image if using arbitrary texture sizes, like 1920x1080
and using power of two textures, like 512 x 512 the effect mantains the alignment with the original scene.
is it possible to use different texture values?
Thank you

Branching in the Shader

Hi there! Thanks for making this addon. I was working on porting it to SparkAR but I noticed there is quite a lot of branching in the shader, especially with the G and h1 functions. Apologies for the unsolicited issues, but I wonder if you might increase performance by using arrays instead of the branching if statements.

  float h1[5] = {0.1507, 0.6836, 1.0334, 0.6836, 0.1507};
  float G[3] = {0.0312, 0.7753, 0.0312};

And then later on, you can also simplify this calculation be only calculating the weight once:

float weight = h1[dx + 2] * h1[dy + 2];
acc += col * weight;

The last parts of each section of the shader could remove the check for if acc.a == 0.0 to also read something like:

float mask = step(0.00001, acc.a);
fragColor= vec4(acc.rgb / acc.a, 1.0) * mask + acc * (1.0-mask);

poisson disc

Thanks for making this add-on.
Can it be used to do poisson disc sampling? i.e. get a point cloud instead of manipulating a texture?

Like here:
https://www.jasondavies.com/poisson-disc/