HI WRT your OGL read, I suspect you are doing this in a process with NO OGL context, OSG 2.x is multi-threaded by default unlike 1.x, so you can only do OGL calls in the Draw process with say a draw callback ( see examples and mailing list archive on the subject)
Also See the examples in 2.4/5 for render to textures -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Roberts, Gareth Sent: Monday, July 21, 2008 5:42 AM To: OpenSceneGraph Users Subject: Re: [osg-users] Render to Texture I used this code... const int TEX_WIDTH = 512; const int TEX_HEIGHT = 512; osg::ref_ptr<osg::Texture2D> texture (new osg::Texture2D()); texture->setTextureSize (TEX_WIDTH, TEX_HEIGHT); osg::Image* image = new osg::Image; image->allocateImage(TEX_WIDTH, TEX_HEIGHT, 1, GL_RGBA, GL_UNSIGNED_BYTE); texture->setImage(0, image); osg::ref_ptr<osg::Image> zim = texture->getImage(); unsigned char* imptr = zim->data(); With OSG 1.0 and was able to readback the image via the pointer imptr. The same code fails with OSG 2.0 and 2.4 I have also used an openGL read with osg 1.0, this also fails with osg 2. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Sent: 16 July 2008 14:48 To: OpenSceneGraph Users Subject: Re: [osg-users] Render to Texture *** WARNING *** This mail has originated outside your organization, either from an external partner or the Global Internet. Keep this in mind if you answer this message. I'm not sure what is going on but I switched to dumping a "png" file and still see the banding (see attached)... Are you sure the PNG plugin can handle dumping an RGBA GL_FLOAT image? All I did was add a osgDB::writeImageFile(*_image, "somefilename.png") at the end of the GL_FLOAT/RGBA if statement in MyCameraPostDrawCallback::operator() in the osgprerender.cpp example and then ran this example using "--image cow.osg". Paul P. ----- Original Message ---- From: J.P. Delport <[EMAIL PROTECTED]> To: OpenSceneGraph Users <osg-users@lists.openscenegraph.org> Sent: Tuesday, July 15, 2008 8:11:14 AM Subject: Re: [osg-users] Render to Texture Hi, make sure the image writer can handle your image format. Bands usually mean an alignment error in the data the writer expects. E.g. expects binary input data to be RGB, but the data is RGBA. .jpg does not support alpha I think. Try .png jp [EMAIL PROTECTED] wrote: > I'm attempting to render to a texture and then dump the rendered > texture to a file (every frame), but I'm having trouble. > I've attempted to use the osgprerender example (using the --image >option), and replaced the MyCameraPostDrawCallback::operator() to have >a > osgDB::writeImageFile(*_image, fileName); where fileName is a >".tif" file (or .jpg file). > When I look at the .tif file using the Linux "display" program, I get >some funny banded image. What am I doing wrong? > Is there a more efficient way to get access to the rendered image? > Must I allocate an "image" array to the texture to access the image? > Paul P. > > > > _______________________________________________ > osg-users mailing list > osg-users@lists.openscenegraph.org > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph. > org -- This message is subject to the CSIR's copyright terms and conditions, e-mail legal notice, and implemented Open Document Format (ODF) standard. The full disclaimer details can be found at http://www.csir.co.za/disclaimer.html. 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 osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ******************************************************************** This email and any attachments are confidential to the intended recipient and may also be privileged. If you are not the intended recipient please delete it from your system and notify the sender. You should not copy it or use it for any purpose nor disclose or distribute its contents to any other person. MBDA UK Limited, a company registered in England and Wales, registration number 3144919 whose registered office is at Six Hills Way, Stevenage, Hertfordshire, SG1 2DA, England. ******************************************************************** ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________ _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
