Look into a tank

Unity Engine
1

Hi,

I modelled an industrial tank in blender for an VR App. I want to look INTO the tank.
When imported to Unity if I look Into the tank, I see the sky…how can I fix it.
Here the 3d model
18962b46246e4a8db18d3e99cc6bba3b

and here what i see in unity

2

The backside of the mesh object is culled. This can be solved by 2-side shader, but naturally you should instead continue to model the inside of the tank because there are many oddities to render both the frontside and backside of a mesh object in real-time which should be avoided in most cases.

1 Like
3

Thanks for your`quick reply. I am very newbie so I understand “half” what you said. If I understand it right, I could use 2-side shaders, but I shouldn’t.
Unfortuantely I don’t understand very good what you mean with
“but naturally you should instead continue to model the inside of the tank…”.

Does it mean I need to change my model? I apologize if my questions are a bit “silly”. If you dont mind, could you explain a little further what you mean?

Thank you in advance :slight_smile:

4

In Unity polygons are single-sided, meaning you can only see them when the camera is looking at the front of them, they are invisible from the back.

You’ve made the outside of your tank, now you need to make the inside it.

2 Likes
5

Just to add - this is not exclusive to Unity - this is true for all 3D applications.

Look up polygon normal direction in the blender documentation. That should help you understand better.

Create a simple cylinder, invert the polygons so the ‘inside’ of the cylinder displays rather than the outside, attach the cylinder to the existing model - weld the vertices so the new cylinder with inverted polygons is now considered the inside of the existing model. Or you can just extrude the existing edges and recreate the cylinder shape - but most artists use the tools available - and standard primitive mesh shapes are there to help us.

1 Like