[osg-users] Best way to cull object hidden by a mountain

[Chris Hanson]

I might be able to help you with this. Is your source something you can
share, possibly off-list?

On Wed, Jun 22, 2016 at 9:55 AM, Valerian Merkling <niarkoleptik at gmail.com>
wrote:

> Hi,
>
> I'm working with OpenSceneGraph 3.4.0 on a kind of GIS app.
>
> I'm rendering the ground using textured HeightField square. My scene graph
> is cut in two part, a group node with all the textured HeightFields, and
> another containing all my 3D objects (sorted in a quadtree).
>
> I've got a lot of thoses textured heightfield squares, they come in
> different resolution, and will be soon put into a nice QuadTree with LOD.
>
> I would like to use Occlusion Culling to avoid to render object hidden
> behind those Heightfield.
>
> As far as I know there is both OccluderNode and OcclusionQueryNode which
> can be used for culling.
>
> I tried to use OccluderNode but I can't convert HeightField to
> ConvexPlanarOccluder.
>
> Then I tried OcclusionQueryNode (root -> occlusionQueryNode -> QuadTree ->
> objects) but it seems to be too powerful : everything is culled, even the
> heightField part which is not inside the occlusionQueryNode ... :(
>
> I came to realize that I barely understand how to use OcclusionQueryNode
> and OccluderNode, so I would like to have your advice : Is it a good idea
> to use one of thoses ? And how can I use them properly ?
>
> Thank you!
>
> Cheers,
> valerian
>
> ------------------
> Read this topic online here:
> http://forum.openscenegraph.org/viewtopic.php?p=67739#67739
>
>
>
>
>
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>



-- 
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