I have an Imported 3D model. However, the z axis of it point vertically instead of horizontal. I have tried a solution to put this model in an empty object but It seem doesn’t work. Is there any solution on how to swap between y and z axis or fix it?
The real way to fix it is with a 3rd-party DCC tool such as Blender.
You can also try and check the Bake Axis Conversion option in the Model Importer and see if it helps:
A third option is to make a prefab out of the model, where it has an empty game object for a parent, which is oriented correctly. You would then refer to the parent game object instead of the model’s game object when needed.
See also: Change pivot point of gameobject - Questions & Answers - Unity Discussions