Rhino3d to Unity 3d export error

I exported as fbx format from Rhino to unity.All the models are broken.It was already heavy in size.What i found as solution is Copy and paste the model and do a flip which I did but the model size increased heavily.Any Plugin to export Rhino to Unity.

The unity view is given below
https://cdn1.imggmi.com/uploads/2019/2/14/8d3a68516b65cd833ae6f4e88dca4336-full.png

The view from Rhino is...
https://cdn1.imggmi.com/uploads/2019/2/15/04921777b1bd765774b5b60067667b89-full.png

 

Hi,
I can see no image in the provided links.
Some people use the Moi app as an intermediate step.
The workflow is the following: Create a model in Rhino, Copy-Paste in Moi and export as a mesh from Moi.
Moi seems to have better meshing capabilities than Rhino.
Take a look here.