Hi, MRTs are simply not supported in 1.8x, you have to render at least twice, when a blur-factor shall also be outputted... Concerning the GL error: this often happens in combination with foregrounds, but I never have dug deeper into it (though I should have), since it works nonetheless.
Bye Yvonne Am So, 6.06.2010, 17:55, schrieb Carsten Neumann: > Hello Ria, > > On 06.06.2010 05:36, Ria Müller wrote: >> Dirk Reiners schrieb: >>> On 06/05/2010 04:09 PM, Ria Müller wrote: >>>> I try to do a depth of field effect in OpenSG using a two-pass >>>> Post-processing Shader. >>>> On the first pass the scene is rendered, outputting the color, depth and >>>> a blurriness factor (depending on the depth). >>>> On the second pass the image from the first pass is filtered with a >>>> variable-sized filter kernel to simulate the circle of confusion. The >>>> blurriness factor from the first pass controls the size of the filter >>>> kernel. >>>> >>>> For being able to render in the scene to multiple buffers (color in >>>> RGBA8 and blurfactor in RGBA16) at one time I need to use multiple >>>> Render Targets. Unfortunately I'm very new to OpenSG and using 1.8 I >>>> couldn't find any descriptions or examples how to do that. >>>> Up to now I create two diffrent textures and attach them to an >>>> FBOViewport-Object: > > hm, that sounds like the right approach in general. Are you perhaps on > hardware that does not support render targets with different bits per > fragment (you have 32 for the color target and 64 for the blurfactor > target)? > >>> sorry, I don't have the time to look into the details of your code right >>> now. >>> But in general FBO support is much better in OpenSG 2. What you're trying >>> to do >>> is probably pretty simple based on Carsten's Deferred Shading framework, >>> which >>> has to do post-processing anyway. >>> >>> Carsten, can you comment a little bit on this one? > > sorry for the delay, my graphics card decided to quit service yesterday... > >> thank you for your fast answer. >> Unfortunately I need to use OpenSG 1.8 because I use a Stereosystem >> which is based on this version. >> Nevertheless I am interested in Carsten's Deferred Shading framework. >> Maybe I can get some hints from it. > > FWIW, I think a better example in 2.0 is the HDRStage since it has a > pretty similar approach, i.e. render the scene to FBO and run a > post-processing step over it. > >> Does anybody know what the warning " FBO initialize pre OpenGL error: >> invalid operation!" means? > > It reports the OpenGL error "Invalid Operation". What exactly causes > this errors is unfortunately a bit tricky to tell as the place where it > reports the error is *before* initializing an FBO (so the error does not > necessarily have anything to do with the FBO, but is only the place > where it is first caught). > The easiest way to find out what exactly causes the error is to run the > program under an OpenGL debugger. > > Cheers, > Carsten > > ------------------------------------------------------------------------------ > ThinkGeek and WIRED's GeekDad team up for the Ultimate > GeekDad Father's Day Giveaway. ONE MASSIVE PRIZE to the > lucky parental unit. See the prize list and enter to win: > http://p.sf.net/sfu/thinkgeek-promo > _______________________________________________ > Opensg-users mailing list > Opensg-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/opensg-users > --- Yvonne Jung Fraunhofer-IGD | Tel.: ++49-6151-155-290 Fraunhoferstr. 5 | Fax.: ++49-6151-155-196 64283 Darmstadt | email: yvonne.j...@igd.fraunhofer.de Germany | http://www.igd.fhg.de/igd-a4 ------------------------------------------------------------------------------ ThinkGeek and WIRED's GeekDad team up for the Ultimate GeekDad Father's Day Giveaway. ONE MASSIVE PRIZE to the lucky parental unit. See the prize list and enter to win: http://p.sf.net/sfu/thinkgeek-promo _______________________________________________ Opensg-users mailing list Opensg-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/opensg-users
