Real-Time Physics Simulation Forum

Thanks -- i've been reading the thread (and papers) with great interest. Sadly I've only taken one year of linear algebra so I'm not entirely confident about my understanding.. I'm especially interested in the equivalent row-by-row/SCAAT version (as opposed to the big-matrix approach) since it seem...

Hi! I agree with Erin, this is very useful stuff, especially for sanity-checking! Thanks for all the efforts! I have a few comments: * Collision benchmark: it seems that only 3 engines are represented in the graphs? * For the Materials benchmark: Is it possible to plot the 'physically correct' anal...

The main benefit of this paper is that it shows you how to properly extend Jakobsen's method to any sort of constraint (provided it's described as a function of particle positions). Personally I struggled for a long time with getting angle constraints to be stable, and the solver presented by Mulle...

There is a paper on a variation of Featherstone's method using Kalman Filtering that you might find useful. Kalman Filtering, Smoothing, and Recursive Robot Arm Forward and Inverse Dynamics, Guillermo Rodriguez, IEEE Journal of Robotics and Automation, vol RA-3, no 6, December 1987. You can find a ...

In my spare time i have been investigating the solution of constraints at positional level by using the Extended Kalman Filter. Some results are exposed below. If you are not familiar with the basics of Kalman Filtering you are strongly adviced to read the references at the bottom of this post first...

it doesn't seem to work, i just see an empty "graph". Am i missing something? Hi Antonio, Can you tell me which graph you were trying to create and which browser you are using? Thanks. im using IE7 and i tried different graphs and none of them works. i will try with my comp at home. cheer...

aboeing wrote: And some of the result data can be graphed here:
http://www.adrianboeing.com/pal/pal_bench_graph.html

it doesn't seem to work, i just see an empty "graph". Am i missing something?

cheers,
Antonio

Capcom replacing Havok: http://www.developmag.com/news/28512/Capcom-looking-to-expand-in-house-engine I would like to hear the justification on this. Anybody? there is an interesting related article at page 17 of this month's Develop that can be downloaded from: http://www.developmag.com/print-edit...

I'm working (on and off) on a more accurate physics model for Bullet. Right now, the dynamics + friction parts are finished. I need to work on the joints and then clean up the code a bit before releasing it. We've been using our methods to model many robots and it's quite stable and accurate. any l...

deformation, fracture, clothes, hair, physics based animaton, 3d fluids/gases Very true, but do you think you can have everything simultaneously in one game? On current hardware you might consider specializing on one of them (the one that supports your game the best) and concentrate on this. i thin...

But what do you think how a physic engine 2.0 should look like? What will be the differences? Not only from a mathematical/technical side, but also what kind of physics does the player want to see in next-gen games. deformation, fracture, clothes, hair, physics based animaton, 3d fluids/gases? anyt...

When we numerically integrate in Featherstone we dont seem to have many choices as the swept motion is much more complicated as it is function of a link's ancestor joints. Further when we step back in time, we would need to step back the entire hierarchy. Not quite sure what kind of approximations ...

Average physics engine with although Havok may not be an ideal Physics engine are we sure it is average? i mean if we take the list of the available physics engines known to the public and we order them based on some quality criteria, are we sure that Havok is in the middle of the list? i would not...

Hi, a long post to explain clearly what is my problem... I optimize controlers for robots with optimization algos, I use physics engine to simulate a given candidate controler. I have some pretty results with totally artificial robots. By artificial robots, I mean I didn't care too much about size,...

Right now, Bullet doesn't provide an inverse kinematics (IK) system. However, further down the line, a reduced coordinate system based on Featherstone, and IK for dynamic controlled characters is planned. Hope this helps, Erwin regarding Featherstone, wouldn't it cause problems for a possible integ...