Continued working on the model interactions today. I decided to first work on the moving of the model. First I did some simple movement of subviews with the use of UIGestureRecognizer. It has quite a lot of similarities to UITouch.
With that done, I then moved on to try out the same interaction, but with the 3D model. I realized that I was able to do a glTranslatef on the model, however, the model does not seem to appear properly. Then I realized that I would have to do some translation of the coordinates. The UIGestureRecognizer uses the Window coordinate, while OpenGL ES uses the Normalized Device coordinate for model translation. Here are some pictures to illustrate the differences:
Therefore, I proceeded on to work on the coordinates translation. Still have yet to work things out properly. The problem now lies in the part where the model crosses x = 0 and y = 0. There's definitely something wrong with the formula that I have come up with. Gonna have to do more thinking, debugging and researching.
I tried to workaround by making use of UIAnimations. However, while doing that, I came to realize that the rendering method is already making use of UIAnimation.
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