Implement Inventory with 3d Objects

How do I implement the inventory where I would have 3d models inside of each inventory slot. Something like this, but imagine that those are little 3d models:

 

You could use a render texture (https://docs.unity3d.com/Manual/class-RenderTexture.html) with the "Raw Image" UGUI component.

 

Do you mean render the image, save it and then paste into the Raw Image Texture slot?

 

No, you would continue to render to that render texture at runtime as well. That way you could apply a rotation or something to the item, for example.

 

Ok. But what if I have a 100 items? That means I need to spawn somewhere in my scene 100 cameras with 100 objects in front of them, right?