Nicolas Gauvin (nicolas++at++cae.ca)
Mon, 12 Feb 1996 10:55:00 -0500
> If a database function has been specified by pfDBaseFunc, it must call
> pfDBase to carry out default IRIS Performer database processing. pfDBase
> should only be called from within the DBASE callback in the DBASE process
> just like pfCull and pfDraw should only be called in the pfChannel CULL
> and DRAW callbacks (pfChanTravFunc) respectively. If a database function
> has not been specified or is NULL, IRIS Performer automatically calls
> pfDBase from pfFrame.
Now suppose that my DBASE callback function takes more than a frame to complete.
Lets say 20 frames as an example. This could be possible when loading a big terrain tile. This will have the consequence that the pfDBase
function will also be called only every 20 frames instead of every frame.
( I know it is a bit unrealistic to say the my DBASE callback will allways
take 20 frames to complete but lets assume that for this example ).
I would like to know what are the consequences on the "default IRIS Performer
database processing" when this arises. Does this means that minor changes to
the scene graph that may have been made in the APP process will be also delayed until pfDBase is called?
What is the exact role of the pfDBase function beside carrying user
specified pfBuffer requests?
___/ | ___/ Nicolas Gauvin e-mail: nicolas++at++cae.ca
/ / | / Software Developper voice: (514) 341-2000 x2275
/ / | __/ CAE Electronics Ltd. fax: (514) 340-5496
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_____/ _/ _| _____/ Saint-Laurent, Quebec, Canada, H4L-4X4
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