How to add texture to the model from the inside of the ball, the ball from the inside to observe the texture model

Hello. How to get 3d model child object, the child object is added to make the texture, looks like you do not provide a method

Hello, how quickly load large obj model, I need a long time to load on the phone show up, the effect I want to achieve is on the phone you can rotate the camera to achieve the object rotation. Thank you