I have not tried at all the cuda code path. My primary goal was to use VPB on a linux server without any graphics card. You can try to enable cuda acceleration in the code maybe. You can set commpressor.enableCudaAcceleration(true); in TextureUtils.cpp. Just by curiosity, it can be interesting to see if it really improves the performance.
Fabien -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Christiansen, Brad Sent: lundi 11 octobre 2010 10:08 To: OpenSceneGraph Users Subject: Re: [osg-users] New nvtt based compression in VPB Thanks for the answer. I literally just opened up the project to try and track down the issue. I am glad I check my email first! I will apply the patch you submit to my local repository and test it as soon as its available. Have you managed to get the cuda code path working with nvtt? I saw no difference in performance when I rebuilt with cuda support so I am guessing it wasn't being used. Cheers, Brad -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Fabien Lavignotte Sent: Monday, 11 October 2010 4:02 PM To: OpenSceneGraph Users Subject: Re: [osg-users] New nvtt based compression in VPB Hi Brad, I just check the code, in fact it does not work when using --terrain, only with --polygonal. I am submitting a fix to Robert. Cheers, Fabien -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Christiansen, Brad Sent: dimanche 10 octobre 2010 07:02 To: OpenSceneGraph Users Subject: [osg-users] New nvtt based compression in VPB Hi, I have just completed a build of VPB using the new nvtt code path. Everything thing seems to have compiled and linked ok and VPB still works. The issue I am seeing is that the resulting textures arnt compressed. Some processing is definitely being done as using --RGBA-compressed or -compressed-dxt5 results in my test build taking 4 times longer than using --RGBA. The resulting dds images are not compressed at all though. Using RGBA-compressed result in RGBA images and DXT5 results in RGB images (determined using nvtt nvddsinfo). I will try and track down what is going on but it seems very odd. Has anyone had success with this new code path? I am running: Windows 7 64 bit VS 2009 SP1 64 bit builds OSG, VPB and nvtt (and gdal) were all compiled from source using the latest versions. Cheers, Brad DISCLAIMER:------------------------------------------------------------- -------------- This e-mail transmission and any documents, files and previous e-mail messages attached to it are private and confidential. They may contain proprietary or copyright material or information that is subject to legal professional privilege. They are for the use of the intended recipient only. Any unauthorised viewing, use, disclosure, copying, alteration, storage or distribution of, or reliance on, this message is strictly prohibited. No part may be reproduced, adapted or transmitted without the written permission of the owner. 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