Brad, I'll look over your implementation. Thanks for sharing this...:)
-Shayne -----Original Message----- From: osg-users-boun...@lists.openscenegraph.org [mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Christiansen, Brad Sent: Thursday, February 11, 2010 2:35 AM To: OpenSceneGraph Users Subject: Re: [osg-users] 2D rendering priority... Hi, We used this approach for rendering a 2D scene using the painters algorithm (i.e. render back to front according to our own order definition). I have included the most relevent code snippets. No comments on their quality please ; ). 1) Added a 'user data' object (which contains the rendering priority) to each of our leaves. 2) As required, we run a 'RenderPriorityVisitor' over the scene to set the correct priorities into our user data objects. 3) Create a custom render bin and setup your 2D graph to use it: e.g. root2DstateSet->setRenderBinDetails(0, RenderBin2D::BIN_NAME, osg::StateSet::OVERRIDE_RENDERBIN_DETAILS); We use OVERRIDE_RENDERBIN_DETAILS as some of the objects bellow the root of our 2D scene are also rendered in 3D, in which case they may already have different bin details set (e.g transparent bin). The key bit of the custom bin is setting the sort callback. This callback sorts the leaves based on the priority set in the 'user data' object. Hopefully this all makes sence. I implemented this code ~7 years ago so there may be a neater way to do this now, but it is still working well against the latest OSG releases. Cheers, Brad Code snippets: ---- Custom Render Bin /** Automatically registers the bin prototype. */ static osgUtil::RegisterRenderBinProxy s_registerBin(RenderBin2D::BIN_NAME,new RenderBin2D()); RenderBin2D() { //extends RenderBin setSortCallback(new SortCallback2D()); } ---- SortCallback2D void SortCallback2D::sortImplementation(osgUtil::RenderBin* renderBin) { renderBin->copyLeavesFromStateGraphListToRenderLeafList(); std::sort(renderBin->getRenderLeafList().begin(),renderBin->getRenderLea fList().end(),RenderPrioritySortFunctor()); } --- RenderPrioritySortFunctor int RenderPrioritySortFunctor::getRenderOrder(const osgUtil::RenderLeaf* leaf) const { const osg::Referenced* ud = leaf->getDrawable()->getUserData(); if(ud) { const DrawableData* data = dynamic_cast<const DrawableData*>(ud); return data->getRenderOrder(); } return 0; } bool RenderPrioritySortFunctor::operator() (const osg::Node* lhs,const osg::Node* rhs) const { int leftOrder = getRenderOrder(lhs); int rightOrder = getRenderOrder(rhs); if(m_sortMode == SORT_ASCENDING) { return leftOrder < rightOrder; } else { //sort descending return leftOrder > rightOrder; } } -----Original Message----- From: osg-users-boun...@lists.openscenegraph.org [mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Tueller,Shayne R Civ USAF AFMC 519 SMXS/MXDEC Sent: Wednesday, 10 February 2010 11:49 PM To: OpenSceneGraph Users Subject: Re: [osg-users] 2D rendering priority... Brad, Please elaborate...:) I have not played with RenderBin so any code snippets/examples would be appreciated. Thanks, -Shayne -----Original Message----- From: osg-users-boun...@lists.openscenegraph.org [mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Christiansen, Brad Sent: Wednesday, February 10, 2010 12:06 AM To: OpenSceneGraph Users Subject: Re: [osg-users] 2D rendering priority... Hi, I use a RenderBin / NodeMask combination to exactly this and it works well. I can elaborate more if you wish. Cheers, Brad -----Original Message----- From: osg-users-boun...@lists.openscenegraph.org [mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Tueller,Shayne R Civ USAF AFMC 519 SMXS/MXDEC Sent: Wednesday, 10 February 2010 8:18 AM To: OpenSceneGraph Users Subject: Re: [osg-users] 2D rendering priority... Paul, Thanks for the reply. We can have up to 57 levels of priority where each level could have 100-200 simple geometries (i.e. circles, squares, simple line primitives, etc.). It's very rare that all levels are on simultaneously but those that are on, need to stack in priority relative to every other level/group that is on. Realistically, we'll have around 10-15 levels being rendered at the same time. Hopefully this quantity/complexity won't present a problem. I really didn't have any reservations per se about using the RenderBin and NodeMask mechanisms. I suspected that I needed to use them but I wanted to ping the group just to make sure I was on the right track. When using OSG, it's always good to have a reality check before proceeding...:) -Shayne -----Original Message----- From: osg-users-boun...@lists.openscenegraph.org [mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Paul Martz Sent: Tuesday, February 09, 2010 4:07 PM To: OpenSceneGraph Users Subject: Re: [osg-users] 2D rendering priority... Tueller, Shayne R Civ USAF AFMC 519 SMXS/MXDEC wrote: > I have a need to render a bunch of 2D geometry groups that have > different priorities for display (one group rendered on top of the > other according to their priority). I also need to have the ability to > turn the rendering off and on for some of the groups while maintaining > rendering priority. How many different groups do you have, and what is the total data size of all the groups? > I wanted some input or ideas on what might be the best way to handle > this in OSG. So far I've looked at the RenderBin mechanism for > possible priority rendering and the setNodeMask for turning rendering on and off. > I'm not sure this is the most elegant way to accomplish what I need to do. In addition to setting the RenderBin, you'd need to disable depth test to get the painter's algorithm to work properly, of course. The RenderBin and NodeMask mechanisms seem like they're designed for just the tasks you describe. Can you elaborate on why you have reservations about their suitability? -Paul _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.or g DISCLAIMER:------------------------------------------------------------- ---- ---------- This e-mail transmission and any documents, files and previous e-mail messages attached to it are private and confidential. 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