I am new in cocos3d but i know cocos2d. i want to create 3d box dynamically. so what i did inside cc3layer is 

```
-(void) initializeControls {

    [self schedule:@selector(create_box:) interval:2 ];

}

-(void)create_box:(id)sender{

    [self unschedule:@selector(mov_cel:)];
    [[testWorld sharedcontescWorld] world_create_box];
}

```

and in cc3world class is 

```
static testWorld *_sharedcontescWorld=nil;

+(testWorld *)sharedcontescWorld{
    @synchronized([testWorld class]){
        if (!_sharedcontescWorld)
            [self alloc];
        return _sharedcontescWorld;
    }return nil;
}
+(id)alloc{
    @synchronized([testWorld class])    {
        _sharedcontescWorld = [super alloc];
        return _sharedcontescWorld;
    }return nil;
}

    -(void) world_create_box{

    int minx=-50;
    int maxx=50;
    float posx=(float)(minx+arc4random()%maxx);

    CC3MeshNode* aNode;
    aNode = [CC3BoxNode nodeWithName: @"Simple box"];
    CC3BoundingBox bBox;
    bBox.minimum = cc3v(-10.0, -10.0, -10.0);
    bBox.maximum = cc3v( 10.0,  10.0,  10.0);
    [aNode populateAsSolidBox: bBox];
    [aNode setLocation:cc3v(posx,0,0)];
    aNode.material = [CC3Material material];
    [self addChild:aNode];
    id move3d=[CC3MoveTo actionWithDuration:1 moveTo:cc3v(posx,0,100)];
    id remove=[CCCallFuncND actionWithTarget:self selector:@selector(removeObj:)];
    [aNode runAction:[CCSequence actions:move3d,remove,nil]];

}

```

but it doesn't work......can anyone help me?