Search found 29 matches

by biscuit122
04 Dec 2018, 01:59
Forum: General questions
Topic: Why does dummies not follow their parent object's motion?
Replies: 6
Views: 3370

Re: Why does dummies not follow their parent object's motion?

Hello, in the hexapod example, IK works exactly as with any other dynamically enabled and IK controlled robot: the target dummy is moved to a desired position/orientation, and the tip dummy will follow. Cheers Yeah, I know that. But in the moving process, dummy 'hexa_base' is set to move relative t...
by biscuit122
28 Nov 2018, 01:21
Forum: General questions
Topic: Why does dummies not follow their parent object's motion?
Replies: 6
Views: 3370

Why does dummies not follow their parent object's motion?

In general, dummies will follow their parent objects to move, even though they have been set kinematic constraints with corresponding end-effector dummies. But in hexapod.ttm mobile robot tutorial, all of dummies (such as 'hexa_base', 'hexa_footTarget0', hexa_footTarget1', ..., 'hexa_footTarget5') u...
by biscuit122
21 Nov 2018, 03:25
Forum: General questions
Topic: install Vortex on Vrep in Linux
Replies: 4
Views: 3122

Re: install Vortex on Vrep in Linux

coppelia wrote: 20 Nov 2018, 07:09 Well, what I said is: ask the people from CM Labs. That's their software (Vortex) and their website.

Cheers
That's fine. Thanks a lot.
by biscuit122
19 Nov 2018, 18:27
Forum: General questions
Topic: install Vortex on Vrep in Linux
Replies: 4
Views: 3122

Re: install Vortex on Vrep in Linux

coppelia wrote: 19 Nov 2018, 07:59 Hello,

they used to have the linux version as download also available. Can you check with them directly?

Cheers
Fine. But I have not find the linux version of Vortex on website https://www.cm-labs.com/downloads/. Could you please help me? Thank you so much.
by biscuit122
17 Nov 2018, 20:55
Forum: General questions
Topic: install Vortex on Vrep in Linux
Replies: 4
Views: 3122

install Vortex on Vrep in Linux

Hi, I would like to use Vortex physical engine on Vrep in Linux. But I found no Linux version on cm-lab website. Do you know how to solve this problem? Thank you in advance.
by biscuit122
07 Nov 2018, 20:37
Forum: General questions
Topic: Can force/torque control of joint achieve positive and negative motion during one control loop?
Replies: 2
Views: 2273

Re: Can force/torque control of joint achieve positive and negative motion during one control loop?

Hello, you can only set the amplitude of the force/torque. The sign is set via the joint target velocity. So set following: sim.setJointForce(handle,math.abs(f)) if f~=0 then sim.setJointTargetVelocity(handle,math.abs(vel)*f/math.abs(f)) end Cheers Thanks for your brilliant tutorial, which helps me...
by biscuit122
05 Nov 2018, 02:46
Forum: General questions
Topic: Can force/torque control of joint achieve positive and negative motion during one control loop?
Replies: 2
Views: 2273

Can force/torque control of joint achieve positive and negative motion during one control loop?

In this tutorial, I set a sin function to define a joint force control. But it only move in one direction, so if I do not change target velocity, do you have method to move joint in two direction during one control loop? https://github.com/feig122/force_test
by biscuit122
07 Sep 2018, 11:19
Forum: General questions
Topic: How to get the intrinsic velocity of a prismatic joint?
Replies: 0
Views: 12433

How to get the intrinsic velocity of a prismatic joint?

Hi, I have got the current position of a prismatic joint using sim.getJointPosition . But I have not found any other functions in lua to acquire current velocity of a prismatic joint. Could you please tell me? Thanks for your help in advance. In addtion, I would like to change Control properties in ...
by biscuit122
12 May 2018, 03:19
Forum: General questions
Topic: dynamic simulation problem of Stewart parallel mechanism
Replies: 2
Views: 1636

Re: dynamic simulation problem of Stewart parallel mechanism

Your stewart platform seems to be quite nice. I don't see any obvious problem. However, make sure of following: The platform has a dimension of almost 1 meter in height. Is that intended? If yes, remember that if you want to move it fast, this can generate tremendous forces in the joints. Most engi...
by biscuit122
10 May 2018, 02:55
Forum: General questions
Topic: The measurement of force sensors in Stewart platform
Replies: 4
Views: 1887

Re: The measurement of force sensors in Stewart platform

It is not directly computed by V-REP, but by the used physics engine (i.e. Bullet, ODE, Vortex or Newton). It also of course depends on your mass/inertia settings. Can you post your scene? Cheers Thank you so much. I have post my scence in this problem http://forum.coppeliarobotics.com/viewtopic.ph...