GLM-旋转使对象消失

Question

I'm doing the rotation on two objects in OpenGL. one which works:

        Model1 = glm::translate( ... );
        Model1 = glm::scale( ... );
        Model1 = glm::rotate(Model1, 90 , glm::vec3(1,0,0));

and one which doesnt:

        Model2 = glm::translate( ... );
        Model2 = glm::scale( ... );
        Model2 = glm::rotate(Model2, 90 , glm::vec3(0,0,0));

which makes my Object disappear.

I assume this is caused due to multiplication by 0 (or sth similar). Then, how should I represent No rotation?

Is axis-angle a good way of using rotations, or one should store them as quaternions and use a different function or convert back to angle-axis each time Rotation is being applied?

Answer 1

Then, how should I represent No rotation?

By an angle of 0 (instead of 90). Not by degenerating the rotation axis.