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Rotating objects in OpenGL 4.6 can be challenging, especially when the object isn’t centered at the origin. Typically, transformations like translation, scaling, and rotation are applied relative to the origin point (0, 0, 0). However, when an object is positioned elsewhere, rotating it directly can produce unexpected results.

To rotate an object that’s not centered at the origin, the solution involves a sequence of transformations:

Translate the object to the origin.
Apply the desired rotation.
Translate the object back to its original position.
Using the GLM library, a common method is demonstrated through the function RotateObjectNotAtOrigin(). The steps include translating the object to the origin with a negative vector, applying the rotation around a specified axis, and translating it back. This ensures the object rotates around its own axis rather than the global origin, giving more control over the transformation.

The key challenge lies in the order of matrix operations, as OpenGL applies transformations in reverse order. Additionally, care must be taken with translation vectors to ensure accuracy.

By mastering these steps, developers can achieve precise rotations for objects positioned anywhere in the scene. This technique is crucial for game development, 3D simulations, and applications requiring dynamic object manipulation.

If you’re looking to dive deeper, the article also includes links to the OpenGL Transformation Guide and GLM Documentation for further learning