Does it get smoothened or something? I don’t want this to happen, is there any way to keep it raw and original?
I tried changing the import settings, rendering, etc. I couldn’t find a solution.
Yes I can tell the edges are being softened/smoothed in Unity. I don’t use Blender or Unity yet so not sure how satisfactory these solutions mentioned in the links are but check them out and see if there is nice a convenient solution among the suggestions.
To get true sharp edges (flat surfaces), use the Edge Split modifier in Blender. You can either mark what edges you want to split manually, or set a threshold angle to try it automatically. That will separate the polygons out and render like you want.
Unity isn’t “doing” anything with your model, it’s just using more typical game rendering. To get a better preview in Blender of what you’re really going to get, always hit the Smooth button.
Are you sure you applied the edge split modifier in your exported model? If you’re exporting to FBX, the default is to not automatically apply modifiers. That should definitely work (I’ve done it plenty of times).