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Mirrored object flipped in SDK

S

Sinister

Messages
5
Country
hungary
Hello!

I've recently started modelling and airport building in SDK and it's kind of a new thing to me. I've faced with many problems but this one is something I couldn't solve on my own.

blender.png
msfs.png


In blender if I mirror an object, everything seems to be right. But in SDK when I import the whole model, this mirrored object flips (maybe) on all axis. On X and Z for sure.
What I don't understand is that the roof is made of two objects as well, one of them was flipped, and it's still working without any issue. The white object however is flipped. It was a cube which I edited the edges in edit mode and then mirrored on X axis.

I'm using Blender 4.1 and Microsoft Flight Simulator glTF Extension for Blender.

Thank you for helping!
 
Save the .blend file of the object, and zip it. Then attach that to a post.
 
A few problems.
First, Select all in Object mode, then CTRL-A and apply all transforms. This gets rid of scaling and rotational problems. This is a common thing between Blender and MSFS. Always apply transforms.
Second, In Edit mode, Select all. Then under the Mesh tab | Normals | Recalculate Outside. This fixes any normal problems caused by mirroring, or transforming (as above).
Untitled.png


In Object mode again, you might want to Select all again, move the objects to 0,0,0 (world center). Not really needed, but it is neater when placing objects in the sim. Also, it's usual to Select all the objects and Join them. Again, not necessary, but neater.

The big problems are applying the transforms and recalculating the outside normals.
The export settings are also not quite what you want. For one thing, MSFS doesn't support Tangents... this is what I usually use:
Settings.png


You would tick Vertex Colors if you used them. Almost no one does.
 
Thank you so much! I've rebuilt the roof section succesfully by making sure applying all transform and checking if outsides are calculated well.
Thank you for your kind help and advices!
 
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