dyn4j Forum

Sorry to revive the old topic again.. This is due to floating point precision and the iterative nature of the collision resolution solver. Changing the restitution to 0.98 makes the last circle act as if it has a restitution of 1.0. IMHO his seems to be incorrect explanation, since it is gravity rat...

It is very difficult to reproduce it on demand since the culprit for the bug is floating point precision. what i got in debug>> simplex.get(simplex.size() - 1).dot(d) returns double value of order 10e-16 while we are comparing it with 0.0, thats why it gets stuck. BTW the test case (stucks in approx...

The very similar problem consumed almost half of my day. Finally I got the source for the problem (the stuck in loop) in org.dyn4j.collision.narrowphase.Gjk class in this function protected boolean detect(MinkowskiSum ms, List<Vector2> simplex, Vector2 d) { // check for a zero direction vector if (d...

Thanks William .. I am trying to create a body which is allowed to move vertically or horizontally (predefined directions) . For example if body can move in vertical direction only, no effect of forces/impulses should be experienced in horizontal direction, BTW body is free to rotate about center. C...

What should be that best way to restrict motion of body in particular direction only, I am thinking of two possible solutions.. 1. Create new joint (kind of prismatic joint with upper limit set to infinite, other end remains fixed on ground) 2. Create new MassType having infinite mass in direction p...

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I am very glad to share SimPHY : the physics simulator based on dyn4j with you , all the members of dyn4j forum. I was working on the projects since late 2013, and now I have something to show. http://simphy.com/wp-content/uploads/2017/01/simphy5.5_screenshot-1030x473.png The main aim for the projec...

Posting after a big time lapse.. While performing stability checks for Physics simulator [SimPHY], I thought of simulating snake's motion by adding multiple bodies using revolute joint supported by pair of damped springs. The result was amazing, joints behaved very much like vertebrates and setting ...

Hi Willam, I went through few tests for the new Link Shape and the results are extremely satisfactory. Actually this is exactly what I did, when I tried implementing edge shape (except one bug in my implementation that was measure cause of jerk). I couldn't create any jerk condition so far using 3.2...

I will test tomorrow and send feedback