Real-Time Physics Simulation Forum

Re: How to run the "Hello World" PyBullet example

2021-02-20T23:30:22+00:00

I tried to use PyBullet but it is very complicated and I cannot understand haw to use it with OpenGL. The Panda3D Bullet wrapper is only one way that I found. And there is a very great manual: https://docs.panda3d.org/1.10/python/pr ... llet/index I hope I will not have unresolved problems with using the Panda3D Bullet wrapper with Qt and OpenGL.

I use:

the Panda3D Bullet wrapper for Physics
PyQt5 (and PySide2) for creating a window
OpenGL 3.3 for rendering

I created a textured cube with Blender and GIMP. I exported the cube to dae (COLLADA) and imported it to my program with built-in Qt XML parser.

Source:

Statistics: Posted by 8Observer8 — Sat Feb 20, 2021 11:30 pm

Re: How to run the "Hello World" PyBullet example

2021-02-20T18:17:28+00:00

I found a solution. It is possible to use Python wrapper of Panda3D with my custom render in OpenGL.

To install Panda3D you need to write:

pip install Panda3D

main.py

Code:

from panda3d.bullet import BulletWorldfrom panda3d.core import TransformState, Vec3, Quat, Point3from panda3d.bullet import BulletBoxShapefrom panda3d.bullet import BulletRigidBodyNodeworld = BulletWorld()world.setGravity(Vec3(0, 0, -9.81))shape = BulletBoxShape(Vec3(0.5, 0.5, 0.5))node = BulletRigidBodyNode('Box')node.setMass(1.0)p = Point3(1, 0, 0)q = Quat.identQuat()s = Vec3(2, 2, 2)transform = TransformState.make_pos_quat_scale(p, q, s)node.setTransform(transform)node.addShape(shape)world.attachRigidBody(node)for i in range(10):    world.doPhysics(0.016)    print(node.getTransform())

Output:

T:(pos 1 0 0 scale 2)
T:(pos 1 0 -0.002507 scale 2)
T:(pos 1 0 -0.007521 scale 2)
T:(pos 1 0 -0.015042 scale 2)
T:(pos 1 0 -0.02507 scale 2)
T:(pos 1 0 -0.037605 scale 2)
T:(pos 1 0 -0.052647 scale 2)
T:(pos 1 0 -0.070196 scale 2)
T:(pos 1 0 -0.090252 scale 2)
T:(pos 1 0 -0.112815 scale 2)

Statistics: Posted by 8Observer8 — Sat Feb 20, 2021 6:17 pm

Re: How to run the "Hello World" PyBullet example

2021-01-28T14:20:26+00:00

Please, write that it is impossible.

Statistics: Posted by 8Observer8 — Thu Jan 28, 2021 2:20 pm

Re: How to run the "Hello World" PyBullet example

2021-01-28T04:03:58+00:00

I use Bullet from C++. Could I use C++ Bullet library from Python without PyBullet? I really do not understand how to rewrite C++ code with OpenGL to PyBullet and OpenGL.

Statistics: Posted by 8Observer8 — Thu Jan 28, 2021 4:03 am

Re: How to run the "Hello World" PyBullet example

2021-01-28T03:40:39+00:00

What version of PyBullet I must install to run the example above?

Statistics: Posted by 8Observer8 — Thu Jan 28, 2021 3:40 am

How to run the "Hello World" PyBullet example

2021-01-15T18:38:41+00:00

I try to run the first official example: https://github.com/dgym/pybullet/blob/m ... loworld.py

I installed PyBullet like this:

Code:

pip install pybullet

When I try to run the example I get this error message:

Code:

Traceback (most recent call last):File "main.py", line 1, in from bullet.bullet import (ModuleNotFoundError: No module named 'bullet'

I think it is because the example is old (Mar 31, 2012) and PyBullet was updated. The module name is "pybullet". I renamed import like this:

Code:

from pybullet import (    Vector3, Transform,    BoxShape,    DefaultMotionState,    RigidBody,    DiscreteDynamicsWorld)

I have this error message:

Code:

pybullet build time: Nov  3 2020 18:27:37Traceback (most recent call last):File "main.py", line 1, in from pybullet import (ImportError: cannot import name 'Vector3' from 'pybullet'(C:\Users\8Observer8\AppData\Roaming\Python\Python37\site-packages\pybullet.cp37-win32.pyd)

Could you copy the official example above and try it you your machine? How I should to change the example to run it? I want to use PyBullet with OpenGL and PyQt5. I want to have GUI and 3D graphics with Physics in one window. Please, help me to run the simple PyBullet example above.

Statistics: Posted by 8Observer8 — Fri Jan 15, 2021 6:38 pm