"The sandboxie" type of game. Help

Unity Engine
1

Hello,
I am trying to create game ( Just basic stuff) like game named Sandboxie. http://www.thesandboxgame.com/
I got basic dirt spawning and dropping on the ground. But the problem is : There is spaces between pixels (Dirt ) , and i dont want it, soo what should i do? Make grid or what, i dont know. The second problem is rigidbody. If i create over 100 rigidbody (Dirt pixels), then i get fps drop. How dirt should drop without rigidbody?What should i do.

This is my project : http://youtu.be/MmzXxLJo-r8

I dont want those little gaps : 0:15 sec.
I dont want to get that bounciness : 0:32 sec.

Thanks

2

Are you using rigidbodies?
If so you might end up having huge performance problems when many objects are in the scene.

I suggest you look into two dimensional arrays and go from there.