process 1 

 generate the 3d model of the object by 123d catch

1. get the 123d catch app from app store 

2. sign in with your autodesk account(or create a new one) 

3. follow the trial of the app and take pictures around the object that you want to create the model

 tips: 
a: do not take the picture in a moving situation since background change may confuse the app

b: do not choose the object with great glare surface otherwise the shinning parts may be erased by the app

4. after some time of "thinking some more" and "finalising the model" the result will come out 

 tips: 

it is ashamed to say but actually a good result need many attempts. maybe more than your imaginary(of course, it may be my own situation since i am not a smart guy lol). if the object has smooth surface, most of the time the result maybe like crushed pieces. thus, you need to change the light condition and background and re do it.