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In Blender, the origin of mesh shapes like Cube or Sphere get added with the center of the object at the world origin. But that's not what we usually want for flight simulators. We want the base-center of the object at the world origin. With AI Copilot's help, I made an addon to achieve this for any object... even one that has been moved or rotated or scaled. First, it applies all transforms, then sets the origin to the bounding box base-center. Then it relocates that origin to the world origin. It's attached. Just add the zip file to Blender as any other addon. Select the object in object mode, use the object menu. It is: Apply Transforms & Reset Origin to Bounding Box Base.
If an object has been accidentally rotated, you can then adjust the rotation, and re-apply the addon, until you straighten it out.
If an object has been accidentally rotated, you can then adjust the rotation, and re-apply the addon, until you straighten it out.