Hi Jung Lee,
Jung Lee wrote:
> Hello great OpenSG users,
>
> I have two simple questions on data exchange in the cluster mode of OpenSG.
>
> Q1: When running an OpenSG application on a linux cluster, what data are
> exchanged between nodes in the cluster? are they graphics primitives, kind
> of message, thread data, parts of scenegraph or anything else?
>
OpenSG synchronizes anything that is derived from FieldContainer. That
basically includes the whole scenegraph and everything that hangs from
it as well as Windows, Viewports, Cameras etc. You can also create your
own classes, as long as they are derived from FieldContainer (created
using fcdEdit or fcd2code resp.) they will be sent across the cluster.
This is the basic mechanism.
It then is used by the cluster servers to open up local windows and draw
the part of the screen that they're assigned to. That is just one way of
using it though. the cluster synchronisation is more general.
> Q2: Also, I was wondering how OpenSG processes several input events. For
> example, If a user gives a mouse event (through GLUT?) in a head
> workstation, how is it sent to each node in cluster?
>
It isn't. The only thing that is sent are the effects on the scenegraph.
There is only application running oin teh master node that processes
user input and simulation. Whatever it does to the scenegraph is
synchronized, and only that.
If you want input distribution you can check out VRJuggler, that's how
they do cluster sync. There are pros and cons to both approaches, but
that's a different discussion.
Hope it helps
Dirk
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