Curious about GLSL shaders for various effects

I’ve heard about the magic of GLSL shaders for a while, but now I’d like to start learning about how to use them. I think I understand the basics of the process thanks to this-helpful-article-for-Processing, but I’m not sure I’m ready to take the leap to writing shaders from scratch.

I’m really interested in shaders that do visual effects on existing geometry like blurring, glowing and color effects. In other words, I want to use oF to build geometry (like primitives like cubes and spheres) on the screen that are further augmented by shaders to look nicer. I know shaders can be used to do much more, but I figured this might be a good place to start.

I know there are several GLSL sandboxes out there (like the heroku.com sandbox), but I am having trouble separating out the shaders that only add visual effects, rather than generate shapes and forms as well.

This is probably aiming a bit high, but I’d love to find some shaders that let me approximate the wonderful effects shown in Robert Hodgin’s work (see http://www.flickr.com/photos/flight404/sets/72157622679279798/) and Memo Akten’s work (see http://www.memo.tv/amoeba-dance/).

Does anyone have any resources or tips for me to find some visual effect shaders?

Hello,

Have you seen this?

http://www.openframeworks.cc/tutorials/graphics/shaders.html

The tutorial code isn’t in the latest release (afaik), but you can find it on github. I’ve been tinkering with them myself. :slight_smile:

I’d also recommend checking out shadertoy.com, though do be aware that those are WebGL and will need a little tweaking to work in OF.