Hi Christain,
On Tue, Mar 10, 2009 at 2:25 PM, Christian Sam wrote:
> as far as i understand every Drawable object in the scenegraph does have a
> "_boundingBox" data member.
>
> * does the user have to manually initalize this boundingBox (with a call like
> "myDrawableOject.computeBound()"), or has it already been set by osg to
> nodes' geometry extent (xmin, xmax, ymin, ymax, zmin, zmax)?
The BoundingBox is computed automatically when the dirtyBound flag is
set, if you modify the geometry then you should call
drawable->dirtyBound() to force an update.
> * if the user wants to query, if a ceratin vec3 position lies inside a
> Drawable object, can this be done with something like:
> "myDrawableObject.getBound().contains(osg::Vec3f(...))"?
Yes, this is what the contains(Vec3) method is for ;-)
> * if the user has a non-rectangluar polygon (e.g. an area in form of
> pentagram), will the above also work? if not, can you give me a hint how to
> implement an adequate contains()-query?
Well there isn't a BoundingBox::contains(anyShape) method so the
answer has to be no. You'll need to build your own test.
Robert.
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