Search found 9 matches

by ardabbour
Mon Sep 03, 2018 11:35 am
Forum: PyBullet Support and Feedback
Topic: How to disable collisions?
Replies: 4
Views: 2810

Re: How to disable collisions?

You can use visual shapes without collision shapes. For example, your URDF code can be: <?xml version="1.0"?> <robot name="cube"> <link name="base_link"> <collision> <geometry> <box size="0 0 0"/> </geometry> </collision> <inertial> <mass value="0"/> <inertia ixx="0" ixy="0" ixz="0" iyy="0" iyz="0" ...
by ardabbour
Sun Apr 29, 2018 10:21 am
Forum: PyBullet Support and Feedback
Topic: pybullet collision masks
Replies: 2
Views: 1719

Re: pybullet collision masks

I am not exactly sure what you mean, but you can identify different visual shapes and collision shapes in your URDF file.
by ardabbour
Fri Jan 26, 2018 4:36 pm
Forum: PyBullet Support and Feedback
Topic: Collision Resolution
Replies: 2
Views: 1594

Re: Collision Resolution

I am completely stumped here, I looked around HopperBulletEnv, and its dependencies, but couldn't find anywhere how in those environments constraints were defined to allow motion in 2D. import time import pybullet as p p.connect(p.GUI) SURFACE = p.loadURDF("surface.urdf", useFixedBase=True) c = 0.51...
by ardabbour
Tue Jan 23, 2018 9:41 am
Forum: PyBullet Support and Feedback
Topic: Collision Resolution
Replies: 2
Views: 1594

Collision Resolution

An automatic collision resolution takes place when we step the simulation and 2 or more objects are in collision. Can we confine this resolution to 2D? That is, if 2 objects are in collision, they should be moved out of each other by applying forces to 2 axes out of 3. Is there such a way to do this...
by ardabbour
Tue Jan 23, 2018 9:39 am
Forum: PyBullet Support and Feedback
Topic: Hollow shapes
Replies: 5
Views: 3328

Re: Hollow shapes

Thank you very much, this worked perfectly!
by ardabbour
Thu Dec 14, 2017 11:01 am
Forum: PyBullet Support and Feedback
Topic: sw2urdf export x.urdf can not be loaded to pybullet
Replies: 2
Views: 1382

Re: sw2urdf export x.urdf can not be loaded to pybullet

When you export using the sw2urdf tool, you can't just move or copy the URDF file alone without its folder. You should give the path of URDF in the folder exported by the tool. So, if you move the entire folder exported by the sw2urdf tool to your root directory, you should be able to use something ...
by ardabbour
Thu Dec 14, 2017 10:52 am
Forum: PyBullet Support and Feedback
Topic: Hollow shapes
Replies: 5
Views: 3328

Hollow shapes

Hello, I'm trying to detect collision between shapes that can be placed within each other. I created a hollow shape and its filling in SolidWorks, then exported them to URDF format using the popular ROS addon for this job. The STL file used for the mesh is correct and representative of the hollownes...
by ardabbour
Mon Oct 09, 2017 6:07 pm
Forum: General Bullet Physics Support and Feedback
Topic: Bullet Physics Equations
Replies: 3
Views: 2018

Re: Bullet Physics Equations

Thank you very much! I'm trying to do just that but in Python, do you know if that is possible? Also, I'm trying to find the governing equations. When two objects are created in collision, and they push each other out, how is the resulting force calculated? Is it modeled as an (most probably) elasti...
by ardabbour
Fri Oct 06, 2017 8:47 am
Forum: General Bullet Physics Support and Feedback
Topic: Bullet Physics Equations
Replies: 3
Views: 2018

Bullet Physics Equations

Hello, Where can I find the physics equations implemented by the Bullet Physics Engine? Specifically, I am looking for the equations that govern the collisions in a pybullet simulation. If two objects are created in collision (sharing some or all the same mesh points), they push each other out. 1) W...