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BONK -- Ouch!
Spherical Collision Detection and Response in 3D
Issue: 2.4 (March/April 2004)
Author: Lars Jensen
Author Bio: Lars Jensen started programming before many of you started breathing...and he'll still be at it after you're all dust! Bwahahahaaa-a-a-a...
Article Description: No description available.
Article Length (in bytes): 26,765
Starting Page Number: 23
RBD Number: 2412
Resource File(s):
2412.sit Updated: Monday, March 15, 2004 at 1:03 AM
Related Web Link(s):
http://www.gamedev.net/reference/list.asp?categoryid=45#99
http://www.gamedev.net/reference/articles/article1234.asp
http://www.wheatchex.com/projects/collisions
http://www.quesa.org/
http://mathworld.wolfram.com/QuadraticEquation.html
http://mathworld.wolfram.com/VietasFormulas.html
Known Limitations: None
Excerpt of article text...
Collision detection (figuring out whether objects come in contact with one another) and its sibling, collision response (figuring out what to do about it) are rich, complex topics in computer simulations of the physical world. There are many such simulations: computer-aided design tools, movie special effects, even screen savers... and, of course, games.
In Issue 2.2 (Oct/Nov 2003) of REALbasic Developer, Thomas Reed's article Collision Detection and Response showed how to simulate a round ball bouncing off a flat surface. In this article, we'll cover a related topic: how to simulate collisions among spheres moving in a 3D environment, and how to make them react in a fairly realistic way. Even if your objects aren't actually spherical, the collision detection technique code can serve as a quick initial test, after which you can investigate potential collisions in more detail.
We'll look at a few fast, general routines to handle this situation, along with their derivations, and a general framework in which to make them run. You can skip the math and physics if you like, but you'll need to know vector arithmetic to use the code.
...End of Excerpt. Please purchase the magazine to read the full article.
Article copyrighted by REALbasic Developer magazine. All rights reserved.
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