Question

Is there a way to identify which object is calling the draw method.

Creation:

joint.model = [[Box alloc] init];

The calling code:

    [joint.model draw];

The draw method (within Box class):

-(void)draw
{   
        glBindVertexArrayOES(_boxVAO);
        glDrawArrays(GL_TRIANGLES, 0, 7055*3);
}

How can i receive the joint object in my draw method?

If more class info is necessary i can attach, but i did not assume since theres not much more.

Answer 1

The model object needs to have a pointer back to joint in order to use it in the -draw method. So you need to either modify the Box class to have a pointer to whatever type joint is, or if Box is defined by a framework you’re using, you need to subclass it. So you could do either:

@class Box {
   Model* model; // Or whatever type model is.
}

Or if that’s not an option, you could do this:

@class BetterBox : Box {
    Model* model; // Or whatever type model is.
}

And make sure that model.joint is created like this:

model.joint = [[BetterBox alloc] init]; // or [[Box alloc] init] if you modified the Box class
[model.joint setModel:model];

Then in your draw method, you can simply access model like this:

- (void)draw
{
    [model someMethod];
    //... etc. ...
}