How to texture the inside of a sphere (or cylinder or cube)

Questions & Answers
1

I might be extremely dumb but I still don't grasp how I can apply a texture inside a shape in Unity3D. Same, I want to have a collider INSIDE the object AND outside the object. If only I could find how to do this !

Someone answers very laconically on the forum about normal... But no specification.

Imagine a city under a dome. I want to be able to see the dome from inside (I am presently using particles but it is not satisfying) and outside. I would like to have a collider at least inside the dome (to avoid going out of the place).

If it is not possible for a shape to have 2 of these properties simultaneously, no pb, I will use 2 shapes with one slightly smaller for the inside. But how to affect texture and collider INSIDE. I am sure the answer might be very simple.

2

Not sure about the textures - but I know how to have two colliders, one inside and one outside.

Okay, So you have your sphere, already with a sphere collider right? This will be the outer collider, so make it bigger than it already is. Next, create a game empty, and drag this into your sphere (so its a child). Change the position of the empty to 0, 0, 0 in the Inspector, then add a sphere collider to this: Component > Physics > Sphere collider, and make the radius of this smaller (inside collider).

Hope that helps.

3

Yes, it's very simple...just model both the inside and outside.

4

As Eric5h5 said, just model your dome and in whatever software you use apply a Normals modifier and flip the normals.

You could also just use a cubemap for the background image and create a custom mesh for the collisions.