Thanks Robert, I found a (maybe temporary) solution with DrawArrays. I already submitted changes to PrimitiveSet to make DrawElements* more flexible about how much they draw. I think it's good functionality to have in any case. If it doesn't interest you I'll try deriving from DrawElementsUShort and see if I can get better performance than my DrawArrays solution. -- Terry Welsh www.reallyslick.com
> Hi Terry, > > On 17 July 2013 01:20, Terry Welsh <[email protected]> wrote: > > > I'm updating some old code and getting rid of deprecated Geometry > > features. With DrawArrays I could change the number of vertices drawn > with > > setCount(). As far as I can tell, there is no equivalent call when using > > DrawElementsUShort. Am I missing something? Is there a recommended > solution > > for only drawing part of your geometry and not all of it? > > > > osg::DrawElement*() doesn't have support for varying the number of it's > elements set to OpenGL, it just passes the whole array on. > > There are three routes you could possible take: > > 1) Have multiple DrawElements objects that target specific parts of the > overall mesh that you want to render and just add/remove these as required. > > 2) Change the original draw so that it duplicates the vertex data and then > just uses DrawArrays as before. > > 3) Subclass from osg::DrawElementsUShort to override the way it calls > OpenGL so that it passes a custom set size rather than the > std::vector::size() used in the default implementation. > > Robert > >
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