Hi Kim, Thanks for the short explainations. Well first the openscenegraph motionmodel or manipluators, manager aren't working. it would be good to get similar behaviour like in application-viewer example. this would be important for integration into existing applications.
I do now better understand that we need to implement own geometries for water effetc. would it be not much easier that we can append a geometry (osg file, ive file ,... ) which should be used to attach the water shaders. Say for limit we attache a xy plane with shaped borders, this would be very usefull for many terrain visualisation applications, even for osgEarth this could be once an option for the ocean. of course we have fast unlimited ocean effects but once we have a lake this would not help, right? or could it be an option to cut the lake from the terrain, then we can define the height of the ocean. i will read the papers again, and i hope i can work out some strategy and new ideas which way we should - can go for further osg integration improvments. regards adrian 2009/6/19 Kim C Bale <k.b...@hull.ac.uk> > Hi Adrien, > > I'm having a slight problem understanding your questions, so I'll do my > best and ask some back... > > >Would it be possible to add a ocean geometry and attach the ocean effect, > shader. if yes how should it be look like, just a >plane? more complex > geometry? My idea would be to add a lake surface, and two rivers with > different waves, and so on. > > Do you mean you would like to add you own method of generating the water > geometry for lakes and rivers? > > If so, I've tried to accommodate for additional type of geometry by > providing the OceanTechnique base class. > > Basically osgOcean is comprised of two main parts. > > OceanTechnique: Which generates and animates the ocean geometry and manages > any level of detail algorithms that are required. It uses osg::Geode as a > base class and therefore drawables for the geometry. A class derived from > this should provide a water shader. Animation is provided by adding a > cull/update callback. > > OceanScene: Which manages the various pre and post render passes required > for the effects. This also includes controlling the different types of > fogging and lighting that are applied based on whether the main camera view > is above or below the water surface. > > If you want to create your own water geometry class you'll have to inherit > from OceanTechnique and then add this class to OceanScene as done with > FFTOceanSurface in the example application. OceanScene will only work with > one OceanTechnique so you'll have to create a new instance of OceanScene if > you wish to use multiple OceanTechniques. The geometry can be as complicated > or as simple as you like. If you apply the current water shader to a quad it > still looks alright and maybe be suitable for some applications. > > These two papers provide very good explanations of generating water > geometry (the first is used in FFTOceanSurface): > > http://graphics.ucsd.edu/courses/rendering/2005/jdewall/tessendorf.pdf > > http://citeseer.ist.psu.edu/cache/papers/cs/26265/http:zSzzSzwww.cs.sunysb.eduzSz~ash > zSzwaterCGF.pdf/ > > The tricky part is the shaders. osgOcean provides a very long list of > uniforms which you can make use of if you wish in custom shaders. Some must > be applied locally to the OceanTechnique (see: > FFTOceanSurface::initStateSet() ), and those related to the multipass > rendering are inherited from the statesets within OceanScene (see: void > OceanScene::init()). > > The shader implementation used in FFTOceanSurface can be found in the > resources directory (water.frag/water.vert). > > If you want to use this shader for your own technique you'll have to apply > it within your OceanTechnique and add the uniforms found in: > FFTOceanSurface::initStateSet(). > > Your best bet is to look at the FFTOceanSurface class and see how it's > implemented. It's not as complicated as it looks, 80% of it is to do with > generating the vertex array and primitives for the geomipmapping routine > which you may not need. > > >we don't need only an unfinite ocean > > You can disable infinite ocean effect using: > FFTOceanSurface::enableEndlessOcean(false,true); > > >Next problem i got is that the default motion models are not working > > Do you mean the ocean waves aren't moving? > > > I hope that answers your questions, otherwise I've just gone off on a very > lengthy tangent :) > > > Kim. > > > > From: osg-users-boun...@lists.openscenegraph.org [mailto: > osg-users-boun...@lists.openscenegraph.org] On Behalf Of Adrian Egli > OpenSceneGraph (3D) > Sent: 19 June 2009 06:22 > To: OpenSceneGraph Users > Subject: [osg-users] osgOcean : Integration into existing Database > /Application > > Hi all > > i am wondering how i can integrate the osgOcean effect into existing > application, database. Would it be possible to add a ocean geometry and > attach the ocean effect, shader. if yes how should it be look like, just a > plane? more complex geometry? My idea would be to add a lake surface, and > two rivers with different waves, and so on. finally we don't need only an > unfinite ocean. Next problem i got is that the default motion models are not > working, i played arround with osgviewer example, and osgOcean example. Well > how should we use both ideas together in a terrain database (currently > existing, but without the nice water effect) > > /regards adrian > > -- > ******************************************** > Adrian Egli > > > ***************************************************************************************** > To view the terms under which this email is distributed, please go to > http://www.hull.ac.uk/legal/email_disclaimer.html > > ***************************************************************************************** > _______________________________________________ > osg-users mailing list > osg-users@lists.openscenegraph.org > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > > -- ******************************************** Adrian Egli
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