Integration

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Runge-Kutta (last update 4.December 2007 0:34)
More stable and more complicated integrator:)
If you are having stability issues with your simulation, give it a try.
Verlet integrator (last update 3.December 2007 23:59)
Mr. Verlet developed this integrator to use it for molecular simulations, but it can be very well used for spring-mass systems. It is easy to use and has good results (at least if you don't care about accurancy).
It's most important feature is stability IMHO.
Symplectic integrator (last update 1.March 2008 9:28)
I have no idea what's it about but some prefer using this over other integrators.



What the hack is this all about? (last update 4.December 2007 0:58)
What does the integrator do?
Original: http://www.gamedev.net/community/forums/topic.asp?topic_id=303496&whichpage=1&#1938504
Overview of integrators (last update 16.December 2007 0:2)
The title says it all.
Original: http://www.gamedev.net/community/forums/topic.asp?topic_id=428502
Simple Integration Algorithms (last update 4.December 2007 1:1)
Detailed description and comparison of most used integrators.
Original: http://www.fho-emden.de/~hoffmann/integ03082002.pdf
Mirror:    integ03082002.pdf
Differential Equations Basics (last update 5.December 2007 10:28)
One part from the Siggraph '97 course by Baraff and Witkins.
Shows how to derive Euler and midpoint(aka Runge-Kutta) integrations. However, you need to know more about calculus to be able to get it clearly.
Original: http://www.cs.cmu.edu/~baraff/sigcourse/notesb.pdf
Mirror:    notesb.pdf
Semi-implicit Euler compared to Verlet, and "Euler-Verlet" (last update 4.December 2007 0:51)
The title says it all.
Original: http://www.gamedev.net/community/forums/topic.asp?topic_id=311098
Explicit Euler, RK2, and RK4 examples (last update 4.December 2007 0:58)
And a little comparison to Verlet.
Original: http://www.gamedev.net/community/forums/topic.asp?topic_id=351999&whichpage=1&#2307815