Search found 249 matches

by Spankenstein
Sat Jan 04, 2014 12:52 am
Forum: Questions and Help
Topic: Object only follows the same path from second iteration?
Replies: 9
Views: 2710

Re: Object only follows the same path from second iteration?

That's a good deal of information which will come in handy for discussion during my viva. As it is only 3 weeks away I won't go diving into the engine's source code. However, I can make it deterministic using a sphere and an immediate reset so that will work out just fine for one of my demonstration...
by Spankenstein
Fri Jan 03, 2014 8:57 pm
Forum: Questions and Help
Topic: Object only follows the same path from second iteration?
Replies: 9
Views: 2710

Re: Object only follows the same path from second iteration?

Technically, recreating the entire Space and readding everything is the brute force approach, but trying to deal with every single piece of bookkeeping in the engine would be more work than it's worth. That's frustrating. To fully eliminate this sort of problem, the space should basically be recons...
by Spankenstein
Fri Jan 03, 2014 7:10 pm
Forum: Questions and Help
Topic: Object only follows the same path from second iteration?
Replies: 9
Views: 2710

Re: Object only follows the same path from second iteration?

Replacing the sphere with a capsule demonstrates non-repeatable iterations: public class IterationProblemDemo : StandardDemo { Capsule capsule; Vector3 ballStartingPosition = new Vector3(0.1f, 11.5f, 0f); public IterationProblemDemo(DemosGame game) : base(game) { BEPUphysics.Settings.CollisionDetect...
by Spankenstein
Fri Jan 03, 2014 7:04 pm
Forum: Questions and Help
Topic: Object only follows the same path from second iteration?
Replies: 9
Views: 2710

Re: Object only follows the same path from second iteration?

So far so good. Will need to delve further: public class IterationProblemDemo : StandardDemo { Sphere ball; Vector3 ballStartingPosition = new Vector3(0.1f, 10.5f, 0f); public IterationProblemDemo(DemosGame game) : base(game) { BEPUphysics.Settings.CollisionDetectionSettings.DefaultMargin = 0.04f; B...
by Spankenstein
Fri Jan 03, 2014 6:04 pm
Forum: Questions and Help
Topic: Object only follows the same path from second iteration?
Replies: 9
Views: 2710

Re: Object only follows the same path from second iteration?

Sure. I'll get something together over the weekend and post it here.
by Spankenstein
Fri Jan 03, 2014 2:17 pm
Forum: Questions and Help
Topic: Object only follows the same path from second iteration?
Replies: 9
Views: 2710

Object only follows the same path from second iteration?

I have created a scenario that drops a yellow ball from a specific location. The ball will reset to that same location once it comes into contact with a green box. On the first iteration the yellow ball follows a path that is different to all the subsequent iterations, which all follow the same path...
by Spankenstein
Wed Jan 01, 2014 7:26 pm
Forum: Questions and Help
Topic: Simulation speed fluctuates between iterations
Replies: 7
Views: 2050

Re: Simulation speed fluctuates between iterations

I'll take that on board and delve further. I can't download the demo I created to highlight problems as the attachment is no longer available: http://www.bepu-games.com/forum/viewtopic.php?f=4&t=1839 Is it stored anywhere on the server? It would save a great deal of time to be able to get a hold of ...
by Spankenstein
Wed Jan 01, 2014 6:58 pm
Forum: Questions and Help
Topic: Simulation speed fluctuates between iterations
Replies: 7
Views: 2050

Re: Simulation speed fluctuates between iterations

The dt never fluctuates either so something else is causing the issue. I have the value for 'dt' printed to the screen each frame and it reads "dt = 0.016667" at all times. It remains the same even when the physics simulation slows down slightly. It is odd because the simulation slows down after a f...
by Spankenstein
Wed Jan 01, 2014 5:58 pm
Forum: Questions and Help
Topic: Simulation speed fluctuates between iterations
Replies: 7
Views: 2050

Re: Simulation speed fluctuates between iterations

I'm using: space.Update((float)gameTime.ElapsedGameTime.TotalSeconds); Using: space.Update() makes the problem worse. How can I ensure that the dt (gameTime.ElapsedGameTime.TotalSeconds) matches the elapsed real time so the fluctuations do not occur? The FPS is constant at 60. What does BEPU use to ...
by Spankenstein
Wed Jan 01, 2014 4:07 pm
Forum: Questions and Help
Topic: Simulation speed fluctuates between iterations
Replies: 7
Views: 2050

Simulation speed fluctuates between iterations

I have an 'Entity' that falls from one point to another in a simulation under the force of gravity (0, -10, 0). If the window in which the simulation runs loses focus then the object will move much faster than if the window has focus. If the object is reset to its original position and orientation o...
by Spankenstein
Wed Nov 06, 2013 7:37 pm
Forum: Questions and Help
Topic: Making the transition from XNA to dependency free
Replies: 2
Views: 1592

Re: Making the transition from XNA to dependency free

Excellent stuff, thank you Norbo. It all works perfectly now :)

Asides from the abundance of MathConverter.Convert methods it was a relatively painless transition!
by Spankenstein
Wed Nov 06, 2013 2:47 pm
Forum: Questions and Help
Topic: Making the transition from XNA to dependency free
Replies: 2
Views: 1592

Making the transition from XNA to dependency free

I've encountered a couple of issues in the transition from XNA to dependency free BEPU. - TriangleMesh.GetVerticesAndIndicesFromModel(Model model, out Vector3[] vertices, out int[] indices) no longer exists. - Assembly generation -- Referenced assembly 'BEPUphysics.dll' targets a different processor...
by Spankenstein
Tue Nov 05, 2013 10:10 pm
Forum: Questions and Help
Topic: Determinism?
Replies: 8
Views: 3875

Re: Determinism?

Excellent. I believe it is worth doing in this case.

Thanks again. :)
by Spankenstein
Tue Nov 05, 2013 8:32 pm
Forum: Questions and Help
Topic: Determinism?
Replies: 8
Views: 3875

Re: Determinism?

Thanks for the advice Norbo, I'll use casting for the time being.

Is there anything wrong with setting the PermutationIndex to 1 each time the solver starts? I have a loop that remains deterministic when doing this but does not if I only set it during initialisation.
by Spankenstein
Tue Nov 05, 2013 8:04 pm
Forum: Questions and Help
Topic: Determinism?
Replies: 8
Views: 3875

Re: Determinism?

One time at initialization. From then on, it will increment itself each frame deterministically. The default value is 0, how does specifically setting it to 0 during initialisation ensure a deterministic simulation? Using the dependency free version will require determining the source of all instan...