Hi Paul, Thanks for the explanations. Right now I get two way to to what I want :-)
Thanks a lot, Regards, Vincent. 2009/1/11 Paul Martz <[email protected]> > The Depth class is simply a wrapper around OpenGL depth controls, all of > which are explained in the OpenGL blue book > > The bin name controls render order of Drawable within a render bin (as > opposed to the bin number, which controls relative processing order of the > bins themselves). OSG defines two bin name: "RenderBin", which sorts by > state, then front to back, and "DepthSortedBin" which sorts in back to front > order. (I might be wrong on the specifics; check the code.) > > To solve your issue, you simply need to do three things: > 1. Disable the depth test (or set it to GL_ALWAYS). > 2. Call setRenderBinDetails and pass in a very large bin number. > 3. Don't draw anything after it, which means no other Drawables in this bin > that might overdraw what you want to show up, no nested post-render cameras, > and no fancy bin nesting. > > Paul Martz > *Skew Matrix Software LLC* > http://www.skew-matrix.com > +1 303 859 9466 > > > ------------------------------ > *From:* [email protected] [mailto: > [email protected]] *On Behalf Of *Vincent > Bourdier > *Sent:* Friday, January 09, 2009 2:58 AM > *To:* OpenSceneGraph Users > *Subject:* Re: [osg-users] Depth, CULL, renderBin : what and when ? > > Hi, > > Thanks for your explanations. > > If anyone can explain me the Depth class and the binName string , I would > be very grateful. > > For now, I've tried this : > > *void setNodeAlwaysRendered(osg::Node* n) > { > if(!n) return; > > osg::ref_ptr<osg::StateSet> state = n->getOrCreateStateSet(); > > //no scene graph culling > n->setCullingActive(false); > > //set depht test off > state->setMode(GL_DEPTH_TEST, osg::StateAttribute::OFF); > > //last rendered > state->setRenderBinDetails(INT_MAX, "RenderBin"); > }* > > But nothing changed... I apply it on a PAT, and on a geode ... but the node > it still culled by the other one... I use HUDs in the scene, but the scene > graph is not attached to them... so I don't think it can explain that. > > Is there some properties to check on the View ? compositeViewer ? camera ? > > Can I apply that on every king of node ? is there a mean to force children > inherit the state ? is it necessary ? > > Thanks for you help. > > Regards, > Vincent. > > 2009/1/9 Serge Lages <[email protected]> > >> Hi Vincent, >> >> I'll try to answer to your questions... >> >> On Fri, Jan 9, 2009 at 9:55 AM, Vincent Bourdier < >> [email protected]> wrote: >> >>> Hi, >>> >>> I need some explanations about the ways OSG allow to modify the render. >>> >>> I am working on a function, to apply to a node, to set it always rendered >>> over the other nodes. In other words, If I apply this on an osgText, I would >>> be able to read the text whatever my camera position can be (of course if >>> text is in the frustum). >>> >>> I make some search and I found a lot of things: >>> >>> * node->setCullingActive() : disable/enable the culling on a node. I am >>> I good, disabling this on a node is not sufficient, after that we need to >>> tell the node when to be rendered, isn't it ? >>> >> >> You don't necessarily need to disable the culling to be sure to see your >> node. The culling is applied depending on the view frustum or the distance >> (small feature culling). And you're right, it's not sufficient to disable >> it. >> >> >>> >>> * state->setMode(GL_DEPTH_TEST, OFF) : same thing ? what is the >>> difference with the first one ? just OSG/OpenGl distinction ? >>> >> >> This one disable depth tests with the other nodes, which means that when >> you'll render your node, OpenGL will not check if your object is behind >> another one, it will render your node on top of everything rendered so far. >> >> It's a first step to be sure to see your node, so don't forget to set the >> GL_DEPTH_TEST to off. >> >> >>> >>> * state->setRenderbinDetails(binNum, binName) : num < 0 will be first >>> rendered, num >0 will be the last ? what is the binName ? I saw >>> "LastRenderBin" or "RenderBin" ... is there some keyword or it is just a >>> name ? what is this word function ? >>> >> >> RenderBins allows you to control the rendering order of your node, I must >> admit that it's a complex topic I don't still fully understand. But what you >> need to know is that if you set something like that : >> >> state->setRenderbinDetails(INT_MAX, "RenderBin") ; >> >> You'll be pretty sure to have your object rendered last. In combination >> with the GL_DEPTH_TEST, you've got your reciepe to get an object always >> rendered. >> >> But be aware to not have an other osg::Camera rendering after the one >> where your object is attached. In this case, be sure that you render your >> object with the last osg::Camera rendered in your scene. >> >> Hope this helps ! >> >> -- >> Serge Lages >> http://www.tharsis-software.com >> >> _______________________________________________ >> osg-users mailing list >> [email protected] >> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >> >> > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > >
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