if you create a single drawable then yes OSG will try to draw them all as this is the granularity of OSG's cull test its tests bounding spheres for speed. If you have multiple drawable's then OSG will draw every triangle of each drawable that is partially in of fully in the frustum The trick you loader needs to do is to create a well balanced quad or oct tree to enable good culling and drawing
Gordon __________________________________________________________ Gordon Tomlinson Product Manager 3D Email : gtomlinson @ overwatch.textron.com __________________________________________________________ (C): (+1) 571-265-2612 (W): (+1) 703-437-7651 "Self defence is not a function of learning tricks but is a function of how quickly and intensely one can arouse one's instinct for survival" - Master Tambo Tetsura ________________________________ From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: Monday, December 01, 2008 2:49 PM To: [email protected] Subject: [osg-users] How to know if polygon is about to be draw onscreen? Thank you, So if I have a really big object (no paging) with 300000 polygons (read using readnodefile()), OSG is going to draw them all??? I'm just trying to reach for the vertex x,y,z, of the polygons in the view frustum. I managed to get the vertex X,Y,Z , but for all the object, not the one in view frustum. For now I have only 1 object in my scene, I switch object base on distance from my surface. thank you Oren David
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