Perlin noise has all kinds of applications, from realistic looking texutres to fire effects to flow fields. It’s a useful tool to have in the belt. If you’ve never heard of perlin noise here’s the wikipedia article and here’s a … Continue reading →
Writing an Image Processing Filter In this post we’re going to cover the basics of how to write an image processing filter using glsl. We’ll be producing a variant of an existing filter. Here’s a look at our final project: … Continue reading →
My latest attempt is to extend the Cocos2d particle system to include a variety of things, multiple particle sprites, animated sprites, flow fields, and eventually a boids algorithm implementation. Today I have a work in progress class that’s by no means ready for any kind of production. I though I’d share it anyway. In it’s current form, it’s a class that uses a Texture Packer plist and spritesheet to import an animation into a particle system structure. It also uses a flow field to apply different velocities based on position. I’m trying to put together some environmental effects for a […]
This post is going to be all about openGL. I don’t explain it from a beginner’s perspective, so if you are new the the openGL API, it may not be easy to follow. I have listed what I think are the best resources in the bottom paragraph. If you’re new, definitely read those, especially Jeff Lamarche’s stuff. I haven’t written anything here for a little while. The main reason is that my attention has turned toward learning openGL and I haven’t gotten to the point that I have anything worth showing off for a little bit. I remember telling a […]
Most of my development work is centered around educational games. I am co-founder of Third Rail Games, LLC. A while back I wanted to modify the particle system in Cocos2D so that it would put out streams of letters in a given sequence instead of the one sprite. Here’s what I ended up with: Here’s the code. I’ll explain the simple modification required to create a particle system that puts out a string of letters, and you’ll see that the same logic could be used to create a particle system that pulls from a sprite sheet. Here’s the code from […]
My very first idea for an iphone app was something that would allow me to navigate the language used in tweets. I wanted to create an app that pulled twitter data, based on a search phrase, parse the words in that request, pull out represent those words by frequency or importance, and present that visually to the user. Then, the user could pick from the resulting words and start the whole process again. Well I eventually was able to create that application, it’s called TweetViz and it’s available on the store. It just uses a word frequency count to display […]
Using Core Graphics to create a CIImage A few months ago I heard about this great app called Composite. This app lets you draw to the canvas using the video feed input as paint. It’s really quite cool and when … Continue reading →
I’ve been working with Core Image for iOS as part of a book project that I am involved in. I’m really excited about what Core Image can do and I’m eager to see what apps use this capability. However, I … Continue reading →
