CcdPhysicsEnvironment Callback Triggers

[Sheikh Dawood]

Hi,

I'm a junior programmer and trying to use the callback trigger feature in the CcdPhysicsDemo app. After adding a physics object into the m_triggerControllers by using the requestCollisionCallback function, how do I catch a callback collision event in the CcdPhysicsDemo class?

I'm trying to capture this collision event to create my own collision response of one of the objects.

[Erwin Coumans]

You can register your callback function using this interface:

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void CcdPhysicsEnvironment::addTouchCallback(int response_class, PHY_ResponseCallback callback, void *user)

Then for each object that you requested a collision callback, this callback function will be called.

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void CcdPhysicsEnvironment::requestCollisionCallback(PHY_IPhysicsController* ctrl)

For example:

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 static bool newCollisionResponse(void *client_data, void *object1, void *object2, const PHY_CollData *coll_data)
{
//process the collision
    PHY_IPhysicsController* obj1 = static_cast<PHY_IPhysicsController*>(object1);
    PHY_IPhysicsController* obj2 = static_cast<PHY_IPhysicsController*>(object2);

//you can also cast to a CcdPhysicsController if necessary

//...
//coll_data is 0 at the moment, this is reserved for future use


return false;
}

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MyClass* client_data =0;
//optionally this 'client_data' can be some class. Then, in the callback you can jump from a static function into that class, to keep things object oriented.

//register this callback
 physEnv->addTouchCallback(PHY_OBJECT_RESPONSE, newCollisionResponse, client_data);

It's probably best to add a Demo that shows the usage, and add this to the documentation/user manual.
Thanks,
Erwin

[Sheikh Dawood]

Thanks!

It works but I also have to include addSensor() to call requestCollisionCallback()