Problems with rotation and scale importing blender object to unity? Replicate unity cube?

Question

I am having real problems and am very new to blender/unity. Right now I have a script that resizes and creates variable longer blocks from a basic cube in unity. I won't show the script as that might not be relevant but this is the result when the script is run to give you an idea -

The original prefab is the default unity cube but the script scales it, etc.

I am trying to replace this cube prefab with an altered cube (a cube with the top right and left edges cut off) to create variably-sized platforms such as this -

I am very new to 3D and so started by just created a simple modified cube in blender -

When I drag this cube into unity it shows up well however when I plug it into my script it elongates the cube in the wrong direction, etc. I know the rotation is off, so I tried to fix that first by rotating the object in blender (this did nothing) and then creating an empty Gameobject and rotating the object there as Unity says, but nothing is working.

In addition to rotation I think the scale of the blender cube is much bigger than unity cube. Furthermore I do not know how to add colliders or other components to my blender object if I just import it- seems I have to drag it into an empty first or the options are all grayed out. Mostly I think I just don't know how to properly import from blender to unity despite tutorials.

This is what happens when I run my script as opposed to original picture -

Clearly a lot is going wrong here. I just want to replicate the default unity cube in blender and modify it so when I bring it back to unity I can use it in my script. How can I do this? What am I doing wrong?

Answer 1

Yes, Blenders scale is different, if you are using FBX (which i would recommend for Unity likes it), there is an export options called: Apply Transform (Experimental!). This works for me, otherwise, scale your final mesh down to compensate (Unity's scale is 100x smaller, so it makes the cube's scale 100x100x100, you can also adjust the mesh import scale in Unity, instead of compensating in Blender).

In Blender, if you make any changes to the rotation in object mode, you need to apply that rotation (CTRL - A) before it exports it. Also, the reason the rotation is wrong is due to Unity using the Y axis as its up axis, and for Blender this is Z. You can compensate by making the up axis of your mesh the Y axis in blender. See posts like this for more info: http://answers.unity3d.com/questions/174832/stopping-the-270-degree-fbx-default-rotation-on-im.html

If you are still experiencing issues something is going wrong in Unity, and you should post the issue in the Unity section, with your script included. And good luck and have fun learning!