Use shared memory to send the scene info into SORT instead of using IO

[JiayinCao]

IO operation is relatively slow comparing with shared memory. It may take me some time because it needs serialisation the whole scene information before starting it.

[JiayinCao]

Since it only takes a little more than 1 second to transfer information through IO, the priority is pretty low.

However serialisation is also necessary before performing rendering task across multiple machines instead of one through network.

[JiayinCao]

Instead of using shared memory to transfer the scene information, using socket would be a more flexible way and easy to extend to support cross machine rendering.

Lower the priority of this task.