How to know the orientation of an object?

OpenGL OpenGL: Basic Coding
1

Hi,

My game is a 3D-puzzle and i want to know when someone wins the game. In order to do this, i must know the orientation of all my cubes and compare it to final positions. Is someone has an idea?

2

Don’t you keep track of the orientation yourself? If you don’t, you should be. Not only for drawing everything correctly, but for using that information to see if someone won.

3

Hi,

The problem is that keeping orientation with angles isn’t working. In fact, making a rotation on x and then on y is not the same as making a rotation on y and then on x. So how to determine the real orientation?

4

Mantain orientation using model view matrix of OpenGL after a lof of rotations is confuse. Is better let fixed world coordinates system and yourself apply the transformation over the vertex of the mesh using a Rotation Matrix or anything else.