Search found 31 matches

by Wilsonator
09 Feb 2016, 02:01
Forum: General questions
Topic: Dynamic Simulation Masses
Replies: 1
Views: 1273

Dynamic Simulation Masses

I have a question about the design consideration as follows: Design consideration 7 Keep masses similar and not too light. When linking two shapes with a dynamically enabled joint or a dynamically enabled force sensor, make sure the two shape's masses are not too different (m1<10*m2 and m2<10*m1), o...
by Wilsonator
05 Jan 2016, 19:57
Forum: General questions
Topic: Smaller physics timestep
Replies: 1
Views: 2208

Smaller physics timestep

Is is possible to reduce the physics engine time steps below 1e-4? I am running a simulation with time steps on the order of 1e-4 and I was trying to set the physics engine time step to 1e-5, but the setting would not stick and corrects to 1e-4.

Is this the hard lower limit in vrep?
by Wilsonator
04 Jan 2016, 18:54
Forum: General questions
Topic: Simulation time synced video recording
Replies: 3
Views: 3166

Re: Simulation time synced video recording

Depending on current computational load, the simulation rendering for me tends to drift between 35fps to 20fps. Is there any way to adjust for this in the video recording? I am currently running a simulation with a low time step that will take ~300s real time to simulation 1s simulation time. For a ...
by Wilsonator
29 Dec 2015, 00:48
Forum: General questions
Topic: Simulation time synced video recording
Replies: 3
Views: 3166

Simulation time synced video recording

I am having trouble recording a video that is synced with simulation time. To clarify, I have a simulation that is running much slower than real time. So lets say 1000s of program run time, equal 10s of simulation time (e.g. 1/100 of real time). I want to record a video of this simulation for say 10...
by Wilsonator
14 Dec 2015, 19:03
Forum: General questions
Topic: how to get vrep run
Replies: 13
Views: 6047

Re: how to get vrep run

Maybe I am missing something... But is there a reason you aren't using the pre-compiled binary provided here http://www.coppeliarobotics.com/downloads.html . Just click on the windows icon, should avoid most of your issues. Sounds like your last question would be best solved from the Remote API. See...
by Wilsonator
01 Oct 2015, 22:27
Forum: Bug reports
Topic: Joint Velocity time delay
Replies: 1
Views: 2914

Joint Velocity time delay

I noticed today that during simulation, there is a difference between graph data reported by "Joint: Velocity" and an derivative data transform of "Joint: Position". Theoretically these should be identical. What I see is that the derivative transform of "Joint: Position"...
by Wilsonator
29 Sep 2015, 18:51
Forum: General questions
Topic: Damping link with two spherical joints
Replies: 1
Views: 2064

Damping link with two spherical joints

So I have a link in my robot that is connected by two spherical joints (see below). In reality there is some friction that prevents a build-up of inertia when the link is in operation. In simulation since spherical joints can only be passive these links build up energy until they are spinning about ...
by Wilsonator
29 Sep 2015, 01:45
Forum: Feature requests
Topic: Closing of a link of chains
Replies: 0
Views: 4472

Closing of a link of chains

As per my question in this forum post ( http://forum.coppeliarobotics.com/viewtopic.php?f=9&t=4325 ), I found it pretty involved just to snap a geometric constraint together to close a link. I would be nice if a feature for snapping together the closing link (pair of dummy links) of two open cha...
by Wilsonator
29 Sep 2015, 00:45
Forum: General questions
Topic: How do I close a link of chains while building model?
Replies: 4
Views: 4239

Re: How do I close a link of chains while building model?

Thanks for the response. Still pretty involved just to snap together a geometrically constraint set of links, but more intuitive than undo.
by Wilsonator
25 Sep 2015, 22:39
Forum: General questions
Topic: How do I close a link of chains while building model?
Replies: 4
Views: 4239

Re: How do I close a link of chains while building model?

Update so far on my solution. When I run the simulator with dynamics off and GCS on, I get the joints to conincide properly. When I stop the simulation they revert to their previous un-linked states. However, if I go edit>undo (or cntrl-z) they will revert to the simulation orientation where they ha...