Search found 34 matches

by biscuit122
04 Dec 2018, 01:51
Forum: General questions
Topic: Can Vrep subscribe 'std_msgs/Float64' type rostopic?
Replies: 2
Views: 654

Can Vrep subscribe 'std_msgs/Float64' type rostopic?

I used Rosinterface to subscribe 'std_msgs/Float64' type rostopic from ROS. But it is always said that is wrong like this: Error: [string -unknown location]:?: ros_callback__std_msgs__Float64: simCallScriptFunctionEx: error (L2_3_callback) Error: [string -unknown location]:?: ros_callback__std_msgs_...
by biscuit122
28 Nov 2018, 01:21
Forum: General questions
Topic: Why does dummies not follow their parent object's motion?
Replies: 6
Views: 1339

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: 1789

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: 1789

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: 1789

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: 1498

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: 1498

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
11 Sep 2018, 13:11
Forum: General questions
Topic: Why does funtion sim.getJointForce have nil value at the first execution?
Replies: 1
Views: 709

Why does funtion sim.getJointForce have nil value at the first execution?

Hi, I have found that sim.getJointForce outputs a nil value at its first loop. Why does it appear?
I am looking forward to your answer. Thanks
by biscuit122
07 Sep 2018, 11:19
Forum: General questions
Topic: How to get the intrinsic velocity of a prismatic joint?
Replies: 0
Views: 1343

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
01 Sep 2018, 14:51
Forum: General questions
Topic: The API function and joint dynamic properties of force control and position control for a primastic joint
Replies: 6
Views: 1476

Re: The API function and joint dynamic properties of force control and position control for a primastic joint

To set a negative force, you'll have to set a negative target velocity ( sim.setJointTargetVelocity ). But you should keep the same amplitude of that target velocity. Cheers Thanks for your help and time. In your words, it means that a force controller needs setting target velocity and force for a ...