FixBlenderImportRotation wiki scipt x mirror issue

Question

Hello, i found this cool editor script to fix blender's rotation at import. But soon i noticed it is mirroring x axis which is also cause of flipped normals (he is fixing them at line 63).

So i put x*-1 in this line:

  vertices[index] = new Vector3(vertices[index].x *-1, vertices[index].z , vertices[index].y );

And commented out code that is flipping normals.

It works, but i'm not sure if i'm doing it right and i don't know why is rotation at line 31 needed. Shouldn't be swapping axis sufficient?

Thanks for your answers

Answer 1

Best Answer

Answer by Harrier · Jul 18, 2016 at 06:24 PM

Partially figured out, unity front is z+ and blender front is y-, code posted in question rotated front to back.

Solution:

 vertices[index] = new Vector3(vertices[index].x , vertices[index].z , -vertices[index].y );

But still i have no idea why rotation is needed.

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meat5000 ♦ · Aug 14, 2016 at 07:38 AM 0

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Its not just one axis pointing a different way but a left-hand vs a right-hand system.

https://www.evl.uic.edu/ralph/508S98/coordinates.html

Answer 2

Answer by meat5000 · Jul 18, 2016 at 11:29 AM

This always worked for me:

http://forum.unity3d.com/threads/blender-unity-rotation-fix.181870/

Remember to apply loc, rot, scale and you could also try the Built-in rotation fix, that was probably derived from Mirgars fix.

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Harrier · Jul 18, 2016 at 12:32 PM 0

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Does this solution cause issues with LookAt?

Quote from FixBlenderImportRotation wiki:

Instead of all the objects in the object to be rotated by x-90 degrees, the mesh data is properly rotated, meaning transform.forward is the real forward axis, and lookAt actually works!

FixBlenderImportRotation wiki scipt x mirror issue

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