Hi Antoine, On 21 September 2017 at 18:55, Antoine Rennuit <[email protected]> wrote:
> Now for the suggestion to use a custom technique, are you thinking about > using GL_SELCT with glRenderMode() and the glInitNames() / glPushName() > functions? If so, do you know any example code implementing this? > Using GL to do picking is possible but I generally wouldn't recommend it as it requires a round trip to the graphics hardware so you have a large overhead associated with the operation. When I'm thinking of a custom approach I'm thinking of a user implementing something like a intersection scheme that uses a hierarchy of osg::Plane to break the volume into half spaces. So you end up with a graph of osg::Plane rather than a single osg::Plane list like you have in a osg::Polytope. Another approach would be to create a graph of Polytope to break up your volume. FYI, osg::Polytope was originally written for view frustum culling and has been expanded to be used elsewhere, in your case you it sounds like you are pushing a bit beyond the tradeoff in design it's adopted - it's built around performing view frustum culling as quick as possible. Robert.
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