Category Archives: Collision Detection

2D polygonal collision-detection and internal edges

Posted on October 31, 2012 by Paul Firth

Hi and welcome back to my blog! I wanted to share something I’ve recently discovered about the heinous problem of internal edges in 2D polygonal collision detection. It’s not a full-solution, but maybe it will give some other programmers an … Continue reading →

Posted in Collision Detection, Geometry, Polygons, Technical | Tagged , , , | 11 Comments

The physics of rolling

Posted on April 2, 2012 by Paul Firth

Hello and welcome back to my blog! This time I’m going to talk about the physics behind simulating a rolling circle, Super Monkey Ball style but in 2d. The key The key to making this work is understanding how we … Continue reading →

Posted in AS3, Circles, Collision Detection, Geometry, Physics, Technical | Tagged , , , , , | 10 Comments

How to make a 2d platform game – part 2 collision detection

Posted on December 14, 2011 by Paul Firth

Hello and welcome back to my blog! In this series of articles, I’m talking about the technology behind a platform game. If you missed part 1 you can check it out here. The language is actionscript 3.0, but the techniques … Continue reading →

Posted in AS3, Collision Detection, Platform game, Technical | Tagged , , , , , , , , , | 26 Comments

How to make Angry Birds – part 2

Posted on June 7, 2011 by Paul Firth

Hello and welcome back to my blog! This is the 2nd part of my series on how to make a game like Angry Birds by Rovio – and its been a while coming… You can read the first part here. … Continue reading →

Posted in AS3, Collision Detection, Graphics, Making angry birds, Physics, Technical | Tagged , , , , , | 137 Comments

Collision detection for dummies

Posted on April 20, 2011 by Paul Firth

Hello and welcome back to my blog! This article is a kind of companion article to Physics engines for dummies and talks about the act of actually detecting a collision between two shapes. This article assumes the reader has a … Continue reading →

Posted in AS3, Collision Detection, Geometry, Physics, Technical | Tagged , , , , , , | 93 Comments

Physics engines for dummies

Posted on April 6, 2011 by Paul Firth

Hello and welcome back to my blog! This time i’m going to talk about the basic components that make up a physics engine and how to put them together; this tutorial is aimed at programmers who have a basic grasp … Continue reading →

Posted in AS3, Beginner, Collision Detection, Geometry, Graphics, Physics, Technical | Tagged , , , , , , , | 160 Comments

Speculative Contacts – a continuous collision engine approach

Posted on March 25, 2011 by Paul Firth

Hello and welcome back to my blog… Today i’m going to talk about a continuous collision detection technique called Speculative Contacts which has been employed in games such as Little Big Planet PS3 and PSP versions. First of all we need to answer … Continue reading →

Posted in Collision Detection, Physics, Silverlight, Technical | Tagged , , , | 95 Comments