ogreopcode.dox

opcode是功能强大

 @mainpage Index

 @section intro_sec OgreOpcode 0.1

  Welcome to OgreOpcode, version 0.1!

 @section menu_sec Usage

 - @ref collide_initialization
 - @ref collide_handling_collisions

 @section collide_initialization Initialization and Setup

 - @ref collide_create_manager
 - @ref collide_define_classes
 - @ref collide_define_types
 - @ref collide_create_context
 - @ref collide_app_objects

 @subsection collide_create_manager Create Collision Manager

 The collision manager must be created prior to using the collision
 detection system.

 @code
     new CollisionManager(mSceneMgr);
 @endcode


 @subsection collide_define_classes Define Collision Classes

 A collision class doesn't need to correspond to an @c EntityType (or game
 object type).  The class is really like a category type for determining
 collision relationships.  So let's say we have @c "vehicle", @c "powerup"
 and @c "bullet" classes.

 @code
     CollisionManager::getSingletonPtr()->beginCollClasses();
     CollisionManager::getSingletonPtr()->addCollClass("vehicle");
     CollisionManager::getSingletonPtr()->addCollClass("powerup");
     CollisionManager::getSingletonPtr()->addCollClass("bullet");
     CollisionManager::getSingletonPtr()->andCollClasses();
 @endcode


 @subsection collide_define_types Define Collision Types

 Collision types define what happens when two classes collide.  They tell
 the collision system whether or not it should report a collision and
 the amount of work that it should do in determining whether or not
 a collision occurred.

 Collision types are one of:

     - COLLTYPE_IGNORE: Don't report collisions.
     - COLLTYPE_QUICK: Do fast %sphere vs. %sphere checks.
     - COLLTYPE_CONTACT: Report the first contact.
     - COLLTYPE_EXACT: Report all contacts.

 So using the example from the previous section, vehicles could bounce
 off each other and requires exact hit, powerups can be picked up by
 being around the right place, and bullets require exact.  Powerups
 ignore other powerups and bullets.  Bullets ignore other bullets.

 @code
     CollisionManager::getSingletonPtr()->beginCollTypes()
     CollisionManager::getSingletonPtr()->addCollType("vehicle", "vehicle", COLLTYPE_EXACT);
     CollisionManager::getSingletonPtr()->addCollType("vehicle", "powerup", COLLTYPE_QUICK);
     CollisionManager::getSingletonPtr()->addCollType("vehicle", "bullet", COLLTYPE_EXACT);
     CollisionManager::getSingletonPtr()->addCollType("powerup", "powerup", COLLTYPE_IGNORE);
     CollisionManager::getSingletonPtr()->addCollType("powerup", "bullet", COLLTYPE_IGNORE);
     CollisionManager::getSingletonPtr()->addCollType("bullet", "bullet", COLLTYPE_IGNORE);
     CollisionManager::getSingletonPtr()->endCollTypes()
 @endcode


 @subsection collide_create_context Create a Collision Context

 A collision context is a space within which collisions occur.  It is used
 to minimize the set of objects that any given object can collide with (since
 it can only collide with those in the same context).  The default collision
 context can be obtained by:

 @code
     CollisionContext *collideContext;
     ...
     collideContext = CollisionManager::getSingletonPtr()->getDefaultContext();
 @endcode

 @subsection collide_app_objects Setting Up Application Objects

 Once you have the collision system initialized and ready to go, it is
 now time to add in your application's objects.

 To do this, you need to do the following things:

    - Create a CollisionShape
    - Load the collision geometry
    - Create a CollisionObject
    - Add the collision object to the CollisionContext

 @code
     Entity* ogreCar = mSceneMgr->createEntity("Car", "car.mesh");
     ...
     CollisionShape *collideShape = CollisionManager::getSingletonPtr()->newShape("fancycar");
     collideShape->load(ogreCar);
     collideObject = collideContext->newObject();
     collideObject->setCollClass(CollisionManager::getSingletonPtr()->queryCollClass("vehicle"));
     collideObject->setShape(collideShape);
     collideContext->addObject(collideObject);
 @endcode

 @section collide_handling_collisions Handling and Responding to Collisions

 Call CollisionContext::collide() in your game loop to compute contacts
 between collision objects in context.

 @code
     bool frameStarted(const FrameEvent& evt)
     {
        ...
        collideContext->collide();
        ...
     }
 @endcode

 You can retrieve the number of collisions and description of a contact
 between two CollideObjects with the given CollisionObject by calling
 CollisionContext::getCollissions():

 @code
     CollisionPair **collisionReport;

     int num_collide = collideContext->getCollissions(collideObject, collisionReport);
     if (num_collide)
     {
         CollisionObject* col1 = collisionReport->col1;
         CollisionObject* col2 = collisionReport->col2;
     }
 @endcode

 CollisionPair contains the information of collision like pointer to
 CollisionObject, the object which is collided, time stamp, contact point and so on.

 You can also retrieve the collision info from CollisionObject::GetCollissions():

 @code
     CollisionObject* collideObject = myEntity->getCollideObject();

     CollisionPair *collisionPair;

     int num_collide = collideObject->getNumCollissions();
     if (collideObject && num_collide)
     {
         collideObject->getCollissions (collisionPair);

         // other process
         ...
     }
 @endcode