For creating a circular hole into a plane, clip planes indeed will not work. But generally speaking, flipping a clipping plane reverses its effect (boolean negation)
To punch holes in arbitrary geometry at render time, a fragment shader will be a good solution. You can check either object or world coordinates, e.g. distance to a given centerpoint and discard the fragment entirely if the computed distance is below a threshold radius. If you need multiple holes, you need to pass a list of such centerpoints and radii to the shader, e.g. in a Uniform array. Christian 2015-07-23 10:49 GMT+02:00 Werner Modenbach <[email protected]>: > Are you sure? I think this will leed to nothing being displayed. But I > didn't verify it. It is just how I understand clipping. > > > Am 23.07.2015 um 10:35 schrieb Christian Buchner: > > > I think you only need to flip the clipping plane around (reverse the > plane's normal vector) to get the desired effect. > > > 2015-07-22 21:28 GMT+02:00 Erik Hensens <[email protected]>: > >> Hi everyone! >> >> I have a geode that is just a quad rectangular surface and I need to be >> able to put circular holes in it. To better visualize what I'm talking >> about, think about a flat slice of Swiss cheese. >> >> I just discovered the ClipNode node and I figured I could achieve what I >> want by adding clip nodes that were the roughly circular, but ClipNode >> apparently behaves opposite to how I originally thought (I'm new to this). >> >> Is there a way to make ClipNode remove parts of the scene instead or >> keeping only those parts in the clip node region? >> >> Or, is there a better way to achieve this flat slice of Swiss cheese >> shape? Thanks very much in advance! >> >> Thank you! >> >> Cheers, >> Erik >> >> ------------------ >> Read this topic online here: >> http://forum.openscenegraph.org/viewtopic.php?p=64437#64437 >> >> >> >> >> >> _______________________________________________ >> osg-users mailing list >> [email protected] >> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >> > > > > _______________________________________________ > osg-users mailing > [email protected]http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > > > -- > *TEXION Software Solutions, Rotter Bruch 26a, D-52068 Aachen* > Phone: +49 241 475757-0 > Fax: +49 241 475757-29 > Web: http://texion.eu > eMail: [email protected] > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > >
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