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Flatten polygon mean.. all of the vertex's Z axis value is 0 right?Hello,
Did you put a Flatten polygon on the surface?

gon wizard in MCX. I unticked "Group polygons 500m". Instead is use the "Optimize reference point location". BTW when I export ground poly from Blender I use a different method:
I'm trying to use optimize reference point location but not workHi, @yh11216 , I think I had a similar issue. What solved it was in Ground polygon wizard in MCX. I unticked "Group polygons 500m". Instead is use the "Optimize reference point location". BTW when I export ground poly from Blender I use a different method:
1. Export as .x file.
2. Import .x file via MCX.
3. In material Editor reselect all textures and convert to "Dxtbmp".
4. Export as .mdl.
5. Open GP wizard
6. Import the .mdl and convert to .bgl as I wrote at the beginning.

Some objects are not yet have material..! If i give all material, it will be working well?@yh11216 It looks like the error you get when you don't assign a material to a feature or maybe your SDK isn't found properly maybe.
I already do that!!it can also be duplicate vertex.
Left menu "T" in edit mode "delete duplicates"

I't could be the issue. select every feature in edit mode and assign a material to each feature.Some objects are not yet have material..! If i give all material, it will be working well?
Maybe SDK will detected well!I't could be the issue. select every feature in edit mode and assign a material to each feature.
Is your SDK detected by Blender?

Awesome airport!!! Thank you for your help really TTI'm pretty much in the same state in my project as you areFrom the current situation below I manage to export as .x file.
View attachment 44232

Solved now!! Cause of the problem is super long runway!! I tried to split runway and it working XDNo problem and thanks!But did it solve your problem?

Good newsSolved now!! Cause of the problem is super long runway!! I tried to split runway and it working XD