Likewise, for the nodes to talk back to the master, they too need to save files with unique
names so that the master knows which node is talking back to it. These returned commands,
or acknowledgments, are known as ???ack??? files, and like the job files, the ack files have a number
to say which node sent it; thus, node 1 returns commands to the ack1 file, node 2 returns
commands to the ack2 file, and so on. Figure 15.16 presents a diagram of the process.
Figure 15.16 Diagram of ScreamerNet command-passing technique.
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Chapter 15 Advanced Cameras and Rendering 615
We know that the master and nodes need to be able to find the command folder in order
to ???talk??? to each other, but the command folder only stores instructions on which scenes
and frames to render; it doesn??™t actually pass any scene data to the nodes. So like the command
folder, the render nodes also need to know the location of the scene??™s content.
The Content Folder
This is where the content folder comes into play. It stores all the objects and images used
to make up the scene, as well as the scene file itself. Like the command folder, all the nodes
must be able to see this folder so that when told to render a frame from a certain scene,
they know where on the network to look for it.
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