From: Lawrence Bertoldi (lberto++at++bert.clubfed.sgi.com)
Date: 01/12/2000 11:44:48
PS:
You might have to turn off the sort order for the opaque bin as well;
the pfChannel manpage has more details
See Ya,
Lawrence Eugene Bertoldi Technical Consultant
vnet 238-8949 Silicon Graphics
phone 301-572-8949 Silver Spring MD.
email lberto++at++clubfed.sgi.com
~;-}>
On Wed, 12 Jan 2000, Stephen Maher wrote:
> Yair,
>
> I have a followup problem .. how do you force render order?
>
> I want to force children B and C of pfGroup A to be rendered in the
> order they're defined in the scene graph (i.e., B, then C). B is
> the result of a pfdLoadFile; C is dynamic geometry. The order of
> rendering between B and C is dependent, understandibly, on what file
> is loaded under B and how Performer sorts the resulting state and
> geosets. But I need B to render before C (because I force
> translucency in C (which is in front of B) using GL_CONSTANT_ALPHA_EXT
> in C's pre draw callback).
>
> I tried adding DRAW callbacks to B, C, and A to turn off sorting, but that
> didn't work.
>
> So then I tried pfChanTravMode(... (PFCULL_VIEW | PFCULL_GSET) ..) for the
> channel to turn off sorting for the whole channel, but that didn't work
> either.
>
> Only after I stripped all the geostate's from all the geosets under B did
> B render before C. Yuck.
>
> I guess the next step is a custom bin, but shouldn't the above steps
> achieve what I want?
>
> Thanks,
> Steve
>
>
> On Tue, Jan 11, 2000 at 05:42:57PM -0800, Yair Kurzion wrote:
> > >
> > > Yair Kurzion wrote:
> > > >
> > > > Hello Steve !
> > > >
> > > > Say you put a DRAW callback on a node A, and node A has children B, C, D, E.
> > > > Performer will make sure that this callback is called before drawing ANY of the
> > > > children of this node.
> > >
> > > The pre draw is called before all children the post draw is called after
> > > all children.
> > >
> > > >..... If Performer decided to draw some children interleaved
> > > > with other geometry (e.g. B, C, g1, D, E where g1 is some other geometry), it
> > > > will call the draw callback multiple times - once for each time its starts
> > > > drawing some children of A (In the example, the DRAW callback gets called
> > > > before drawing B and before drawing D).
> > >
> > > I'm confused, draw callbacks turn sorting off bellow the node so how
> > > could the above scenario happen?
> >
> > Performer state sorting is local to a pfBin. When different GeoSets and up in
> > different bins, they will be sorted within their bins. State sorting will
> > indeed avoid sorting across a DRAW callback inside a pfBin.
> >
> > -yair
> >
> >
> > --
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> > \__ \__ \__
>
> --
> stephen.maher++at++gsfc.nasa.gov (301) 286-3368 fax:(301) 286-1776
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