<div dir="ltr"><div>Hi Armin,</div><div>Essentially the scene graph is a one-for-one representation of my DOM. Each individual object can be edited, or its attributes changed. </div><div>The DOM can be a small number of geometrically "complex" objects - this causes no performance problems as the geometry "leafs" are large geometrically, or the DOM might have a large number of simple objects.</div><div><br></div><div>A KD tree would be useful for removing "not visible" nodes, but in general they are all visible.</div><div><br></div><div>In "theory" the whole scene graph geometry was flattened to one set of vertex, colors and normals for maximum efficiency - of course, updates to the scene graph would require this structure to be partially or fully rebuilt.</div><div><br></div><div>That's a bit of overkill for me, as I "know" the parent Group node in the scene graph that I want to make more efficient. Typically the objects under this node have the same attributes. </div><div><br></div><div>I could flatten my nodes "manually", but flattening the scene graph seems a typical "use-case" that OSG users would want to do.</div><div><br></div><div>I have done some tests with osg::Optimizer with the MERGE_GEOMETRY option after collecting all the osg::Geometry nodes into a temporary group - this does not do exactly what I want, as it only collects the osg::PrimitiveSets. Not merging the sets themselves.</div><div>Weirdly calling "optimize" also causes my scene graph to stop drawing for some unknown and very frustrating reason.<br></div><div><br></div><div>There is a lot of code in the OSG GLES plugin code that looks promising, but it's quite undocumented and I am having to guess about it's functionality.</div><div><br></div><div><br></div>Andrew<br><br>On Sunday, March 1, 2020 at 6:14:07 PM UTC-8, Armin Samii wrote:<blockquote class="gmail_quote" style="margin: 0;margin-left: 0.8ex;border-left: 1px #ccc solid;padding-left: 1ex;"><div dir="ltr">Iterating over the 5000 children would be pretty slow - what if you could discard some of these children without even looking at them? A hierarchy of sorts, where you can ignore large swaths of those children, would help...<div>Consider, for example, using a k-d tree: <a href="http://www.openscenegraph.org/index.php/documentation/user-guides/107-kdtrees" target="_blank" rel="nofollow" onmousedown="this.href='http://www.google.com/url?q\x3dhttp%3A%2F%2Fwww.openscenegraph.org%2Findex.php%2Fdocumentation%2Fuser-guides%2F107-kdtrees\x26sa\x3dD\x26sntz\x3d1\x26usg\x3dAFQjCNFLyCE1N4jHHrYgWDYPTuuAXyH6rg';return true;" onclick="this.href='http://www.google.com/url?q\x3dhttp%3A%2F%2Fwww.openscenegraph.org%2Findex.php%2Fdocumentation%2Fuser-guides%2F107-kdtrees\x26sa\x3dD\x26sntz\x3d1\x26usg\x3dAFQjCNFLyCE1N4jHHrYgWDYPTuuAXyH6rg';return true;">http://www.<wbr>openscenegraph.org/index.php/<wbr>documentation/user-guides/107-<wbr>kdtrees</a></div><div><br></div><div>Or you can do this on your own, if you like, by grouping nearby nodes into their own osg::Group. Depends what your underlying data looks like.</div><div><br></div><div><br></div><div><br></div><div>I would not recommend combining the geometry into a single drawable unless you expect all of them to be visible at once, and that each piece of geometry is fairly small.</div></div><br><div class="gmail_quote"><div dir="ltr">On Sun, Mar 1, 2020 at 9:07 AM AndrewC <<a href="javascript:" target="_blank" gdf-obfuscated-mailto="QvuHNctmCwAJ" rel="nofollow" onmousedown="this.href='javascript:';return true;" onclick="this.href='javascript:';return true;">ad...@a-cunningham.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div>Hi,<br></div><div>I was wondering what the best practices are for dealing with a complex scene graph where a single osg::Group might have , say, 5000 children where each child is fairly simple osg::Geom geometry. Clearly, this is inefficient and draws slowly.<br></div><div>So obviously, compiling/collecting the geometry into one drawable would be much more efficient. osgUtil::Optimizer does not seem to do this for me, or am I missing something?</div><div><br></div><div>Andrew<br></div></div>
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