Why doesnt seem certain parts of my models

Unity Engine
1

I’ve imported my 3D model to unity but I dont understand why some part of my model are invisible. Does anyone know this problem?
*** I didnt change anything just imported my model to unity 3d scene

7388564--901937--upload_2021-8-4_17-44-0.png
7388564--901937--upload_2021-8-4_17-44-0.png818×615 150 KB
7388564--901934--upload_2021-8-4_17-43-16.png
7388564--901934--upload_2021-8-4_17-43-16.png546×513 48.9 KB

7388564--901934--upload_2021-8-4_17-43-16.png
7388564--901934--upload_2021-8-4_17-43-16.png546×513 48.9 KB
7388564--901937--upload_2021-8-4_17-44-0.png
7388564--901937--upload_2021-8-4_17-44-0.png818×615 150 KB

2

Most likli some of the faces that are not visible in unity have there Normals in the wrong direction.

Make sure you have back face culling enabled in Blender to see what is will look like in unity

3

Actually it didn’t work :confused: All faces are normal and I recognized that nearly all downloaded 3d models have same issues but yesterday I imported my own model and there is no problem, I couldn’t find why. By the way thank you :slight_smile: