There is an example called "collision" that comes with osgBullet. Take a look at the two objects that are created. The box on the left is created with CF_STATIC_OBJECT because it never moves. The box on the right is created with CF_KINEMATIC_OBJECT, and can be moved with ctrl-leftmouse. When you drag the kinematic object into the static object, the collision information is displayed on the console.
I hope this helps. On Sun, Nov 17, 2013 at 10:42 AM, Mots G <[email protected]> wrote: > Hi Paul, > I'm confused between static and dynamic objects. Does dynamic object mean > the rigid body dynamic object and the dynamic world? I thought dynamic > objects were only needed if I had to get inertia and motion states > properties to the objects. In my case I only need to test if the 3D models > collide among themselves so their movement(translations etc) could be > restricted. > > Therefore I was under the impression only the collision library > (osgbCollision) would suffice my purpose. However I'm still missing on > something and unable to get it work. > > Thanks > Mots > > > On Fri, Nov 15, 2013 at 12:32 AM, Paul Martz <[email protected]> wrote: > >> My guess is that you've somehow created the collision shapes as static >> instead of dynamic. Bullet uses the static classification for objects that >> never move. If you have two objects that never move, Bullet will assume >> they never collide. >> >> Although I've done quite a bit of work in the past with Bullet and >> osgBullet, I would not consider myself a Bullet expert. This is really just >> a guess. Since the warning comes from Bullet, the Bullet forum might be a >> better place. osgBullet also has its own discussion group. >> >> >> On Thu, Nov 14, 2013 at 7:56 AM, Mots G <[email protected]> wrote: >> >>> Hi all, >>> I'm trying to use osgBullets in my application for collision detection. >>> The library comes with a sample example for detection between two >>> box-geodes. >>> I've modified it to use a cessna and a cow model and obtained a >>> 'btCollisionObject' by calling: >>> >>> *osgbCollision::btCompoundShapeFromOSGGeodes(cess_model,COMPOUND_SHAPE_PROXYTYPE >>> )* >>> >>> However, the collision detection does not happen and I'm unable to >>> figure out what's going wrong. >>> I also get a warning "warning btCollisionDispatcher::needsCollision: >>> static-static collision". >>> >>> Sorry for the noob question but I'm trying to get this feature in my app >>> and using the bullet/osgBullet library for the first time. Also I'm not >>> sure if this question belongs here or to another forum. >>> Inconvenience regretted. >>> >>> Best regards, >>> Mots >>> >>> _______________________________________________ >>> osg-users mailing list >>> [email protected] >>> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >>> >>> >> >> >> -- >> Paul Martz >> Skew Matrix Software LLC >> >> _______________________________________________ >> osg-users mailing list >> [email protected] >> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >> >> > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > > -- Paul Martz Skew Matrix Software LLC
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