The ARGoS Forum

Hi,

I added a footbot and an eyebot in my arena with dynamics2d physics engine. But in dynamics2d eyebot is not working. So when I change physics engine from dynamics2d to pointmass3d, then footbot does not work.

Can I add both physics engine, if yes then how and if not then which physics engine should I use for both of them?

Thanks

Hi Jaffar,

In the physics_engines section of the .argos file, you can add multiple physics engines. Just put a dynamics2d engine and a pointmass3d engine there.

Then, initialize the position of your robots to have a zero z for the foot-bots (so they get caught by the dynamics2d) and a value > 0 for the eye-bots (even 0.01 is enough) to be caught by the pointmass3d engine.

Cheers,
Carlo

Hi Carlo,

I tried following the instructions you gave to Jaffar. I added both the dynamics2d engine and pointmass3d engine to the physics engine section. I have a single footbot with position="1,1,0" and a single eyebot with position="0.5,0.5,0.5". I get this error:

[FATAL] Failed to initialize the space.
[FATAL] Multiple engines can house "body_0", but a movable entity and can only be added to a single engine. Conflicting engines: 0xbf99449c

Have I done something incorrectly? Also, I read in one of your papers that it's possible to partition the arena into prisms where each prism is assigned to a different engine. Is there any sample code showing how to do this?

Thanks,
Mostafa

Hi Mostafa,

Could you please attach the file you're using, so I can reproduce the problem?

I'll add an example on how to use multiple engines in the next few days.

Cheers,
Carlo

Hi Carlo,

This is my configuration file. I attached it as a .txt file because the forum won't let me attach a .argos file.

Cheers,
Mostafa

Hi,

I am almost at the end of a long stretch to meet a deadline I also have a new release of ARGoS ready by the end of the week that will address the issue you found. Sorry for the long wait!

Cheers,
Carlo

Hi Carlo

That's great to hear!

I will upgrade after the release and let you know if I encounter any issues.

Thanks!
Mostafa

Hi Jaffar,

I finally made a new release of ARGoS (3.0.0-beta36) that addresses the issues you encountered. Try to launch your experiment now, and it should work.

As soon as my deadlines allow me, I'll make a couple of examples to show nifty tricks you can do when playing with several physics engines.

Cheers,
Carlo