[ODE] ODE tests and ubstable numerical situations

[Bartosz Dobrzycki]

<>Hello!

My name is Bartosz Dobrzycki and I am a student of computational physics 
at University of Wroclaw (Poland).
During my studies I have been particularly interested in real time 
computer simulations and numerical methods.
I use ODE for game developing.
I found the article: "Product Review of Physics Engines, Part One: The 
Stress Tests (Gamasutra, September 13, 2000).
Here is the link:
http://www.gamasutra.com/features/20000913/lander_01.htm <> 
In my opinion, the article is really interesting and very useful - it 
shows methods of testing physical engines!
So I decided to create a series of tests for ODE  and compare the 
results with the engines tested in the article.
I have been using ODE for about 8 months - during that time I found some 
problematic numerical situations -
it gave me the ideas to create my own tests: Rope Simulation, Cloth 
Simulation, The Trebuchet Test, RagDoll Test,
Tunneling of the Fast Moving Objects.  I'm going to simulate the 
SoftBody model with ODE as well.
My goal is to find out, what you can do with ODE? What kind of real time 
simulations (games) you are able to create -
is it possible to create the simulation of a Trebuchet with all the 
mechanisms (the complex mechanical structures?). What kind of numerical 
situations should we avoid?  In my opinion it will be very useful for 
all the users of ODE to answer to that questions. When my work will be 
completed, I'm going to put all the codes (C++, OpenGL) to my 
website:http://panoramix.ift.uni.wroc.pl/~dobrzyck/ 
<http://panoramix.ift.uni.wroc.pl/%7Edobrzyck/> 

I'm also planning to create polish version of ODE Users'Manual.
Here is my question - if you found some unstable numerical situations 
using ODE
(for example - when you drop relatively big and heavy box on a 
relatively small and light box, the second one will be jittering)
please let me know - I will write the simulation in order to test that.
If you have any ideas for new test, please let me know!
My e-mail: bartosz_dobrzycki at o2.pl

Greetings and have fun using ODE!
Bartosz Dobrzycki




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