[osg-users] bounding box collisions (without osgbullet)

[Julien Valentin]

Hi Sebastian

If you have  few dynamic objects, an update callback with an inner intersectvisitor can do the trick ...
In other case you may have to reimplement the wheel (like a AABB sweeping broaphase) , so osgBullet seams the best fit 
And to finish, if you have massive dynamics:
-bullet3 have a GPU experimental Broadphase 
-you could implement your own GPU collision stuff (as most SPH implementation does)

PS: if osgBullet annoys you because of its dependencies with osgWorks, i have removed all of them on my git:
https://github.com/mp3butcher/osgbullet


Trajce Nikolov NICK wrote:
> Hi Sebastian,
> 
> it is for simulation, i have a moving entity and a terrain (with buildings etc). Now I am not after triangle level intersection, but after Entity BBox collision with the terrain (enough is true false). I was thinking to do it really very simple by having LOS rays from the entity center to the corners of the BBox. The entity can move in any direction
> 
> 
> On Mon, Mar 13, 2017 at 9:41 PM, Sebastian Messerschmidt < ()> wrote:
> 
> >   Hi Nick, 
> > 
> > basically this is not an easy task. What exactly do you expect as a collision result? 
> > I've implemented a triangle-box collision with MTD (minimal transform distance = vector describing how to push the box to get it exactly away from the colliding triangle). OSG has all the math facilities to do this, but I guess you'll save a lot of headache using pyhsics etc. for dynamics. So maybe try to explain the problem you're trying to solve a bit more in detail.
> > 
> > Cheers
> > Sebastian 
> > 
> > 
> > >  no one on this?
> > > 
> > > On Sun, Mar 12, 2017 at 9:53 PM, Trajce Nikolov NICK < ()> wrote:
> > > 
> > > >  Hi community, 
> > > > 
> > > > what would be the best way to implement bbox collision with terrain, from what is already in OSG (no bullet etc)?
> > > > 
> > > > 
> > > > thanks a bunch as always,
> > > > Nick 
> > > > 
> > > > -- 
> > > > trajce nikolov nick
> > > > 
> > > > 
> > > > 
> > > > 
> > >  
> > > 
> > > 
> > > 
> > > -- 
> > > trajce nikolov nick
> > > 
> > > 
> > > 
> > > 
> > > 
> > > 
> > > 
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> -- 
> trajce nikolov nick
> 
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