Re: multiple perflys

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Jim Helman (jimh++at++surreal)
Fri, 14 Oct 94 15:43:54 -0700

Running multiple copies of a performer app on the same gfx pipe is a
bad idea. In FREE_RUN, it shouldn't be any worse than any other GL
app, but the graphics context switches between rendering contexts
alone makes it a bad idea performance-wise.

> one approach seems to be to have the four databases loaded with one
> performer app and switch between one of the four scene graphs with
> each frame, rendering the database at 40 Hz while effectively
> rendering each user's view at 10 Hz (there is no need for synchronization)

No need to switch databases. Parent them all under the pfScene and
just give each child of the pfScene a different DRAW mask, e.g.
0x1, 0x2, 0x4, 0x8, with pfNodeTravMask(). Then assign each
channel the corresponding draw mask with pfChanTravMask(). Set the
eyepoint independently for each pfChannel, and everything will work
swimmingly.

rgds,

-jim helman

jimh++at++surreal.asd.sgi.com
415/390-1151

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