OpenSceneGraph Forum

[Brian R Hill]

Folks,

Can primitivesets be shared between geometrys similarly to vertexes,
colors, and texcoords?

Brian



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[Robert Osfield]

HI Brian,

On Mon, Oct 27, 2008 at 7:25 PM, Brian R Hill <> wrote:

Quote:

Can primitivesets be shared between geometrys similarly to vertexes, colors, and texcoords?

I have never tried this, but it should work just fine.

Robert.


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[Brian R Hill]

Robert,

It does work when adding them during runtime, but the .ive/.osg
reader/writer don't support sharing them. They always write out full
definitions and expect to read in full definitions. For my current use
(creating sequences from osgCal/cal3d models) the prim overhead isn't too
bad, at least not yet. I'll come back to the .ive/.osg plugins after I
finish what I'm currently doing.

Brian

wrote: -----

To: "OpenSceneGraph Users" <>
From: "Robert Osfield" <>
Sent by:
Date: 10/28/2008 05:12AM
Subject: Re: Sharing PrimitiveSets between Geometrys

HI Brian,

On Mon, Oct 27, 2008 at 7:25 PM, Brian R Hill <> wrote:

Quote:

Can primitivesets be shared between geometrys similarly to vertexes, colors, and texcoords?

I have never tried this, but it should work just fine.

Robert.





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[Robert Osfield]

Hi Brian,

On Tue, Oct 28, 2008 at 12:55 PM, Brian R Hill <> wrote:

Quote:

It does work when adding them during runtime, but the .ive/.osg reader/writer don't support sharing them. They always write out full definitions and expect to read in full definitions. For my current use (creating sequences from osgCal/cal3d models) the prim overhead isn't too bad, at least not yet. I'll come back to the .ive/.osg plugins after I finish what I'm currently doing.

Sharing of vertex arrays and primitives set will need to be added to
.ive to enable you to do this, it shouldn't be too hard to do.

Robert.


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[Bill Prendergast]

Quote:

Quote: Can primitivesets be shared between geometrys similarly to vertexes, colors, and texcoords?

Quote:

I have never tried this, but it should work just fine.

Slightly off-topic, but I recently made a visitor that looks for
duplicated texture coordinates (unit 1 uses same TC's as unit 0)
and deleted the duplicate array and shared unit 0 TC's with unit 1.

Treat this as anecdotal for now until I can poke into it a little
more, but this appeared to crash the Tri-Strip Optimizer if I tried
to share TC's before optimization.

Running the same visitor after optimization was OK and I could share
TC arrays with no problems.

- Bill




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