HI J.P, The OverlayNode does use a StateFrustum to cull the overlay texture from being applied behind the projection center, but it only works at the geometry level, so if any of the bounding box of object intersects this frustum then the overaly texture is applied. If you geometry chunks are small enough then it should cull the texture behind the projection. Making two hemispheres won't be fine grained enough to take advantage of this culling.
The other solution is right a shader that disgards the overlay texture when the r texture coordinate is negative, or to use a third texture aligned along the r coordinate to do this for you. Robert. On 5/31/06, J.P. Delport <[EMAIL PROTECTED]> wrote:
Hi, I am using the osgSim::OverlayNode with an earth model attached as the subgraph. I have a local coordinate system with the 0 position at some point on the planet. When I generate an overlay, it appears in the position that I want, but also on the opposite side of the globe. Is there a way to prevent either texture coordinate creation for the far side or to prevent the texture application to the far side? I have though about splitting the globe in two, but the zero position is not fixed in the application. Any pointers appreciated. rgds jp -- This message is subject to the CSIR's copyright, terms and conditions and e-mail legal notice. Views expressed herein do not necessarily represent the views of the CSIR. CSIR E-mail Legal Notice http://mail.csir.co.za/CSIR_eMail_Legal_Notice.html CSIR Copyright, Terms and Conditions http://mail.csir.co.za/CSIR_Copyright.html For electronic copies of the CSIR Copyright, Terms and Conditions and the CSIR Legal Notice send a blank message with REQUEST LEGAL in the subject line to [EMAIL PROTECTED] This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. MailScanner thanks Transtec Computers for their support. _______________________________________________ osg-users mailing list [email protected] http://openscenegraph.net/mailman/listinfo/osg-users http://www.openscenegraph.org/
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