RE: [osg-users] osgEphemeris Culling

Wed, 07 Jun 2006 10:16:39 -0700

David,

 

You are correct!  The EphemerisModel is not being culled—it is just not drawn on the screen.  This confuses me because I thought culling a node and not drawing it were not the same.  Apparently, I am incorrect.  Can someone explain why please?

 

You mentioned that the EphemerisModel may be at a depth larger than 1.  I’m not exactly sure what you mean (I have very little graphics programming experience).  Would you mind elaborating a little more on what you meant, and also the possible solutions?

 

Sorry, I’m pretty new to graphics programming and OSG.  I appreciate your help.

 

Andrew

 

From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of David Spilling
Sent: Wednesday, June 07, 2006 5:39 AM
To: osg users
Subject: Re: [osg-users] osgEphemeris Culling

 

Andrew,

When you say "culled", do you mean that it just doesn't appear on screen, or are you actually testing to see if OSG is culling it?

If the first, then it might be that your projection matrix puts the EphemerisModel at a depth larger than 1, hence it is not displayed. Options might be to allow OSG to compute your near/far values itself, or, if this isn't good enough, look at techniques similar to DepthPartitionNode (which is what I ended up doing).

Hope that helps,

David

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