When I create something in blender and than I export it to unity as an fbx, it is rotated -90 degrees on the x axis to keep it correct rotation but can I export it with (0,0,0) rotation by default ? So it will be correctly rotated and its rotation would be (0,0,0).
There is a script around for this: http://wiki.unity3d.com/index.php/FixBlenderImportRotation
If you don't want to use scripts, here is another workflow:
- Select every object that will be exported, but no child-objects of these, even if they will be exported too
- Rotate them by -90 degrees in the x-axis
- Apply the rotation of every object that will be exported (the child-objects included)
- Select the objects from (1) again and rotate them back by 90 degrees in the x-axis
Make sure that the pivot point for each rotation is the same (e.g. individual origins), so that the objects will end up in their original position and make sure that you apply the rotation of every object in one action, or else the rotation of the child-objects changes again.