osgOQ is no longer an extension -- OcclusionQueryNode is part of OSG v2.4. However, as currently implemented, it does not return to you a count of the number of visible vertices. OSG, like many rendering doesn't provide direct support to return the number of visible vertices. However, you should be able to use any general algorithms that exist to perform this task. To determine the pixel size of a bounding sphere, you can use the distance and radius along with the combined modelview and projection matrices. OcclusionQueryNode could probably be modified easily to return a count of the number of visible pixels of the bounding box, but it doesn't currently do this, as that was not a design goal. -Paul
_____ From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of a.lagnier Sent: Tuesday, May 27, 2008 10:28 AM To: osg-users@lists.openscenegraph.org Subject: [osg-users] Counting visible vertex Hi all, I want to calculate number of no occlusing vertex. But, I don't know how determinate visibility. Must I use osgOQ extension? I have an other question : how can I access to pixel size of an object on screen? I think I must use Cullstack::pixelSize(boundingsphere). I want it for determinate what LOD is visible (with RangeMode PIXEL_SIZE_ON_SCREEN). Maybe there is an other way to determinate it... Any idea ? Thanks, Aude Créez votre adresse électronique [EMAIL PROTECTED] <http://www.laposte.net> 1 Go d'espace de stockage, anti-spam et anti-virus intégrés.
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