Collision Callbacks?

How can OgreNewt warn me when two CollisionPrimitives (CollisionBoxes in the case) collide with eachother?
I guess it has something to do with setAutoactiveCallback or some other Callback function.
Is there any example of how to implement this?

Regards in advance,
Daniel

Do you mean with warn, Collision1 will collide with Collision2 in 2 seconds or do you only want to know when a Collision is?

For the first you can use OgreNewt::CollisionTools::CollisionCollideContinue.

For the second you can use OgreNewt::Collision::setCustomForceAndTorqueCallback.

I hope I can help you with this!

Zero

Thanks!
I meant the second option - to warn me when a collision is happening:

By the API I have this:

void setCustomForceAndTorqueCallback (boost::function< void(c *, Body *)> callback, c *instancedClassPointer)

I tried what follows based on the SimpleBuoyancy Demo - the only one I found that uses setCustomForceAndTorqueCallback

My code is as follows (I am using Python-Ogre but I think the code is really straightforward so C/C++ users may understand)

body.setStandardForceCallback() # This line was more of a guess
body.setCustomForceAndTorqueCallback(self.standardForceCallback, "")
...
def standardForceCallback(me):
mass, inertia = me.getMassMatrix()
print "callback"

Anyway I tried some translation:

body::setStandardForceCallback() // This line was more of a guess
body::setCustomForceAndTorqueCallback(standardForceCallback, "")

The function never gets called
What am I doing wrong?
Is there any example of how to use this callback function?

Regards,
Daniel

PS: My father is actually a partner of a company here in Brazil called Compex Tecnologia

Hmm
body.setCustomForceAndTorqueCallback(self.standardForceCallback, "")
What is this "" in your function call?
Can you show the function definition in phyton?


Regards,
Zero

PS: Nice

The definition is actually quite simple

def standardForceCallback(me):
mass, inertia = me.getMassMatrix() #This line does nothing right now.
print "callback"

When the function is called it only prints out "callback", so I can know when it is being called.
But it isn't being called.

The "" is a string with no chars. Apparently it is a required parameter that I don't know of.
If i take it out it gives me an error message.

Hmm the "" may should be the pointer to your class? In C++ I have to pass the pointer to the Class too.

Zero

You are right
If I didn't pass a pointer to my class as a parameter there is no way OgreNewt could find my function.

What has got me no errors is:

body.setCustomForceAndTorqueCallback(self, "forceCallback") #My function is now called "forceCallback"


But I'm still not getting callbacks

Is there a problem if the bodies are controlled by me? I mean, I have a body that is always at the mouse position -
at the intersection when my "camray" collides with a ground object. Then this body interlaces with other bodies already on the ground by my mouse movement,
not by the physics engine. Can this be a problem?

Danaugrs

Do you use to move the body, setbodyPositionOrientation?

Zero

Yes

Can you use the C++ version of OgreNewt with Phyton?
Then download the newest version, I posted them here in the forum!
and then after you call setbodyPositionOrienation call OgreNewt::World::CollisionUpdate().

Zero

The new version looks really cool!
But unfortunately I can't use it with python..
I'm gonna post this same problem on the Python-Ogre forum,
maybe they know something that is python particular..
If you find out what's wrong post it here

Thanks a lot Zero! (or is it Sven? )
Danaugrs

Yes i know what is wrong
You place a body at a place, but you dont update the collision. So the callback cant be called. I hope you understand what I want to tell you
You have to use setForce and the other functions^^ Or you get the new OgreNewt to run and use the CollisionUpdate() function.

I hope you understand what I mean.

Regards,
Zero (No not Sven^^, Bastian!!)

I got it now =D
Python-ogre already comes with a binded version of OgreNewt for python
I can't build it from source (I don't know how ) so I can't use the new version.
I will see if the Python-ogre admin will include the new version of OgreNewt on the next update =D
Thanks Bastian

Cheers,
Danaugrs