model disappears when doing sio2ObjectSoftCopy

So I integrated tutorial 61's example code for sio2ObjectSoftCopy. I'm copying a cube that resides in the .sio2 file and adjusting its x/y before displaying the copy. Most of the time this works fine, but quite often the original cube randomly disappears (and the new one doesn't appear either). I tried sio2ObjectHardCopy and the same behavior occurred.

Here's the relevant code:

Code:


SIO2object *_original = ( SIO2object * )sio2ResourceGet( sio2->_SIO2resource, SIO2_OBJECT, "object/Cube" );

if (_original) {      
   //NSLog ( @"found obj to duplicate %");
   
   static unsigned int i = 0;
   char tmp_name[ SIO2_MAX_CHAR ] = {""};
   sprintf( tmp_name, "%s%d", _original->name, i );
   
   SIO2object *_new = sio2ObjectHardCopy(_original, tmp_name);
   
   _original->_SIO2transform->loc->x = x;
   _original->_SIO2transform->loc->y = y;
   _original->_SIO2transform->loc->z = 0.0f;
   
   sio2TransformCopy( _new->_SIO2transform,
                     _original->_SIO2transform );
      
   sio2TransformBindMatrix( _new->_SIO2transform );

}


Does the pivot point of your model in centered?