Finally, the pan gesture for translation is completed! The translation for all objects works very well now.
With regards to the problem that I mentioned yesterday, I actually found the cause to it. It has got to do with the object's scale in the scene! Objects with a smaller scale translate lesser while objects with a larger scale translate more, even though with the same translation value. I came to realize that when I went back to take a look at the scenes that I have created. The reason that the cylinders translated so much was because at the point of importing, the cylinders were very small in comparison to the heart model. Hence, I remembered that I actually scaled the cylinders up a lot.
Therefore, we would have to factor in the objects' scale in the scenes as well. Worked that out fairly quickly, and we are done! Hence, for translation, here are the few things that we have taken into consideration for the translation algorithm:
- Camera's Z position
- Object's Z position that is set by us when drawing (glTranslate)
- Object's default scene Z position
- Object's default scene scale
Some improvements have been made to how we pick the objects for translation as well. Previously, every time when the state of the pan gesture is being changed, we would do a check to see which object the user is touching on. Now, we have it changed to such that when the pan gesture has began, we would store the index of the object that the user has selected. This way, we have prevented some issues with collisions.
It is time to start work on labeling next week~
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