Re: [osg-users] Simple way to determine if a point is inside a geometry
Hi Gordon, Thanks for your reply, I'm going to give that a go. First check - see if its in the bounding sphere of the PAT Second check - go for the bounding boxes of the drawables. I guess I'll need to inverse transform my point by the PAT's matrix first? Anyway good to know it's not too difficult, Thank you, Andrew -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=15633#15633 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Simple way to determine if a point is inside a geometry
FYI Bounding::sphere and bounding box both have ::contains( const vec3 vec ), both return true if the given point is within their volume __ Gordon Tomlinson gor...@gordontomlinson.com IM: gordon3db...@3dscenegraph.com www.vis-sim.com www.gordontomlinson.com __ -Original Message- From: osg-users-boun...@lists.openscenegraph.org [mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Andrew Thompson Sent: Thursday, July 30, 2009 5:10 AM To: osg-users@lists.openscenegraph.org Subject: Re: [osg-users] Simple way to determine if a point is inside a geometry Hi Gordon, Thanks for your reply, I'm going to give that a go. First check - see if its in the bounding sphere of the PAT Second check - go for the bounding boxes of the drawables. I guess I'll need to inverse transform my point by the PAT's matrix first? Anyway good to know it's not too difficult, Thank you, Andrew -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=15633#15633 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Simple way to determine if a point is inside a geometry
Yep, will do, its a great start though, thanks -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=15658#15658 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] Simple way to determine if a point is inside a geometry
Hi there, Given a single object in my scene graph defined by the hierachy PositionAttitudeTransform (x1) | Geode (x1) | Geometry (x1) | Drawables (x Many) Is there a simple way to determine if a point location is inside the geometry, taking into account transforms applied by the PAT? I am reluctant to use the intersect visitor, as the scene is very cluttered and I will likely get lots of intersections, and this may be time-consuming to determine whether the intersection was with my geometry object. Any ideas? Thank you! Andrew -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=15610#15610 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Simple way to determine if a point is inside a geometry
One way might be something along the lines of 1) use the boudingspehere of PAT to see if you point is with in the bounding sphere if its not then stop/bail ( you will have to transform the sphere by the pat transforms etc) 2) Iterate over each drawables boundling box ( transfromed by applying the Pat matrix ) and test the to see, if the point is inside the bounding box, do what you need to do 3) get to this point , your not inside so bail You could also trnasform the point into the PATs reference frame as well There are helper functions/methods for these tests etc. Gordon Product Manager 3d __ Gordon Tomlinson Email : gtomlinson @ overwatch.textron.com __ -Original Message- From: osg-users-boun...@lists.openscenegraph.org [mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Andrew Thompson Sent: Wednesday, July 29, 2009 11:54 AM To: osg-users@lists.openscenegraph.org Subject: [osg-users] Simple way to determine if a point is inside a geometry Hi there, Given a single object in my scene graph defined by the hierachy PositionAttitudeTransform (x1) | Geode (x1) | Geometry (x1) | Drawables (x Many) Is there a simple way to determine if a point location is inside the geometry, taking into account transforms applied by the PAT? I am reluctant to use the intersect visitor, as the scene is very cluttered and I will likely get lots of intersections, and this may be time-consuming to determine whether the intersection was with my geometry object. Any ideas? Thank you! Andrew -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=15610#15610 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.or g ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
