Access Objects in a Scene

#1 You can use the following commands:

- "t2dSceneGraph::getSceneObjectCount()"
- "t2dSceneGraph::getSceneObjectList()"

The first command gives you an object count and the second one simply retrieves a complete list of objects. You can access this list using the standard "getWord()" call.


There is an additional (and more useful) command in the next release:

- "t2dSceneGraph::getSceneObject(index)"

This new command lets you access objects in the scene by their logical scene-index one at a time.

Hope this helps,

- Melv.

#2 Eric,

If you want this call now then you can add the following code and recompile:

To the "t2dSceneGraph.h" file (next to the "getSceneObjectList()" call):

inline t2dSceneObject* getSceneObject( const U32 objectIndex );

To the "t2dSceneGraph.cc" file:

//-----------------------------------------------------------------------------
// Get Scene Object.
//-----------------------------------------------------------------------------
ConsoleMethod(t2dSceneGraph, getSceneObject, S32, 2, 2, "Gets the selected Scene Object.")
{
    // Fetch Object Index.
    const U32 objectIndex = dAtoi(argv[2]);

    // Fetch Scene Object.
    const t2dSceneObject* pSceneObject = object->getSceneObject( objectIndex );
    // Check Object.
    if ( pSceneObject != NULL )
    {
        // No error so return object id.
        return pSceneObject->getId();
    }
    else
    {
        // Error so warn.
        Con::warnf("t2dSceneGraph::getSceneObject() - Cannot retrieve specified object index (%d)!", objectIndex);
        // Return no object.
        return 0;
    }
}
// Get Scene Object.
t2dSceneObject* t2dSceneGraph::getSceneObject( const U32 objectIndex )
{
   // No objects if scene is empty!
   if ( getSceneObjectCount() == 0 )
      return NULL;

   // Reset object index.
   U32 objectCount = 0;

   // Fetch First Object.
   t2dSceneObject* pSceneObject2D = getProcessHead()->getProcessNext();

   // Process Objects until all actioned.
   while ( pSceneObject2D != getProcessHead() )
   {
       // Is this our object?
       if ( objectIndex == objectCount )
       {
           // Yes, so return object.
           return pSceneObject2D;
       }

        // Fetch Next Object.
        pSceneObject2D = pSceneObject2D->getProcessNext();

        // Increase Object Count.
        objectCount++;
   };

   // Return Error.
   return NULL;
}

Hope this helps,

- Melv.

#3 Excellent! Exactly what I needed... I'll throw that new code in there now so I'll be set for the next update.

Thanks again...

#4 @Eric: I got a notification of your post but it's not here so I assume you deleted it? I'll reply anyway.

Quote:Looks like I need the getProcessHead() method also...

Yeah, sorry about that. Here are some of the missing commands:-

To the "t2dSceneGraph.h" file (next to the "getSceneTime()" call):

inline t2dSceneObject* getProcessHead( void ) const         { return mpProcessHead; };

To the "t2dSceneObject.h" file (next to the "getProcessMount()" call):

t2dSceneObject* getProcessNext( void ) const            { return mpNextProcess; };
t2dSceneObject* getProcessPrevious( void ) const        { return mpPreviousProcess; };

Or you can simply refer directly to "mpProcessHead" and "mpNextProcess" if you wish.

Sorry for the confusion,

- Melv.

#5 Yea, I found the mpProcessHead and mpNextProcess stuff from the other methods, so I was able to get it working. One other change to make though also.

This:

ConsoleMethod(t2dSceneGraph, getSceneObject, S32, 2, 2, "Gets the selected Scene Object.")

Should be:

ConsoleMethod(t2dSceneGraph, getSceneObject, S32, 3, 3, "Gets the selected Scene Object.")

Other than those changes, it worked perfectly. Thanks again...

#6 Yes, thanks for pointing that out!

- Melv.