Hi, I am using version 2.9.5. I haven't had a chance to try 2.9.6 yet but I am using a fairly recent version.
As I said in a previous message, the RenderStage for the RTT camera has the correct viewport setup (in both its camera and in its member variable) after the cull traversal. After establishing this I wasn't sure what else to try. I am happy with my work around for now though. Cheers, Brad -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Robert Osfield Sent: Friday, 15 January 2010 4:55 PM To: OpenSceneGraph Users Subject: Re: [osg-users] Viewport inheritance and RTT Hi Brad, I've read this thread and a bit suprised that the RTT Camera's Viewport wasn't being used. Which version of the OSG are you working with? I wonder if this is a bug in a older version of the OSG or something still lurking in the OSG. The way that the viewports are intended to be inherited is from above such that if the RTT Camera doesn't have it's own viewport then it should inherit this from it's the nearest camera in it's parental chain. If the RTT Camera does define it's own viewport then this should be used and there shouldn't be a need to provide one via a StateSet. This is working from memory though... this is how it should work, hopefully the code should be doing this as well ;-) Cheers, Robert. On Fri, Jan 15, 2010 at 6:11 AM, Christiansen, Brad <[email protected]> wrote: > Hi, > > For the record, I have found a workaround for the issue. > > To fix the problem, I did the following the RTT Camera: > > ss = rttCamera->getOrCreateStateSet(); > osg::Viewport* vp = new osg::Viewport(0,0,textureSize,textureSize); > ss->setAttributeAndModes(vp, osg::StateAttribute::OVERRIDE & > osg::StateAttribute::ON); > > > It was my understanding that this would have the same effect as just > setting on the viewport on the camera. However, this works, but just > setting the viewport doesn't. > > Cheers, > > Brad > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of > Christiansen, Brad > Sent: Friday, 15 January 2010 8:55 AM > To: OpenSceneGraph Users > Subject: Re: [osg-users] Viewport inheritance and RTT > > Hi, > > Thanks for your answer. > > In relation to your comment: > >> I'm still not sure why you want to use a slave? I remember something > you >> said about shadows, but don't understand why shadows should differ >> between slave/not slave. Pre-render should work fine with just an RTT >> camera placed somewhere in the graph and in this case you can set >> everything manually. > > I am using an RTT camera placed somewhere in the graph and I am setting > everything manually. As far as I can tell I am using a very simple, > basic case for RTT (it doesn't actually involve shadows). This is why I > am so stuck on what can be going wrong. > > I will modify one of the examples to match what I am doing so I can > examine the issue in a very simple setup and go from there. I am really > stuck on what to do to try and fix this. Thanks again for your help. > > Cheers, > > Brad > > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of J.P. > Delport > Sent: Thursday, 14 January 2010 4:11 PM > To: OpenSceneGraph Users > Subject: Re: [osg-users] Viewport inheritance and RTT > > Hi, > > Christiansen, Brad wrote: >> Hi, >> >> Just 'resubmitting' my issue with a more simple question to see if >> anyone has any ideas. >> >> What are the rules with viewport inheritance? >> - My understanding is: >> If a camera has a viewport set, this is used when rendering the > cameras >> sub-graph. If it is not set, it uses the parent cameras viewport. >> >> - What I am seeing: >> My pre-render camera (rendering to a texture) has a viewport set but > its >> sub-graph is being rendered using its parent cameras viewport. I have >> double checked that the viewport is set during the cull traversal. The >> pre-render cameras viewport is placed on the stack, and set on the >> RenderStage used to render the camera, yet it is still rendered using >> the parents viewport. >> >> - My question/s: >> What could cause this to occur? i.e. when is a local viewport ignored >> and 'overridden' by a parents viewport. >> >> What should I look at to debug this? I am not sure what to check after >> seeing the Renderstage apparently setup correctly. > > sorry, I can't answer all your questions. > > I don't think this goes as deep as renderstage. Have a look at View and > Viewer and check the handling of slaves. Check where addSlave adds the > View and then check where the list of views is used. > >> >> I am completely stumped now and this is proving a bit of a > show-stopper >> for me. Any suggestions on what to look at would be greatly > appreciated. > > I'm still not sure why you want to use a slave? I remember something you > > said about shadows, but don't understand why shadows should differ > between slave/not slave. Pre-render should work fine with just an RTT > camera placed somewhere in the graph and in this case you can set > everything manually. > > jp > >> >> >> Cheers, >> >> Brad >> >> -----Original Message----- >> From: [email protected] >> [mailto:[email protected]] On Behalf Of >> Christiansen, Brad >> Sent: Tuesday, 12 January 2010 10:59 AM >> To: OpenSceneGraph Users >> Subject: [osg-users] Viewport inheritance and RTT >> >> Hi, >> >> I have a scene setup with a texture attached to a camera which is > setup >> for pre-rendering. >> In my scene I set the viewport for the RTT camera to the dimensions of >> the texture. Despite having done this, the viewport for the RTT camera >> is being inherited from the main scenes camera, i.e. if the viewport > of >> the main camera is (0,0,8000,600) then only this section of the > texture >> is rendered, despite the viewport for the rtt camera being >> (0,0,1024,1024). >> >> I have stepped through the CullVistor with a debugger and have found >> that the viewport does seem to be setup correctly by the cull visitor. >> >> By the time I get to this section of the CullVisitor: >> >> switch(camera.getRenderOrder()) >> { >> case osg::Camera::PRE_RENDER: >> //In the following line the viewport for the camera and the rtts is >> correct >> >> > getCurrentRenderBin()->getStage()->addPreRenderStage(rtts.get(),camera.g >> etRenderOrderNum()); >> break; >> default: >> >> > getCurrentRenderBin()->getStage()->addPostRenderStage(rtts.get(),camera. >> getRenderOrderNum()); >> break; >> } >> >> the viewport seems to have been setup correctly. Both the rtts's >> viewport and the cameras viewport is (0,0,1024,1024), but when it is >> rendered this is not the viewport that is used. >> >> I am not quite sure where to go from here. Does anyone have any >> suggestions on what I may have done wrong or what area I should debug >> next? >> >> I am using version 2.9.5 of OSG. >> >> 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. 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