Hi Toni,
Antonio Bleile wrote:
> Hi,
>
> I'd like to query some occlusions with OpenSG... I don't know
> if there's any support for this in OpenSG. I'd like to render
> a set of points and query their visibility using some OpenGL
> query extension. I know how to do that in OpenGL, but I
> don't know if I can map that somehow into OpenSG. Here's
> a typical loop:
>
> Gluint queries[N];
> GLuint pixelCount;
> glGenOcclusionQueriesNV(N, queries);
>
>
> for (i = 0; i < N; i++) {
> glBeginOcclusionQueryNV(queries[i]);
> // render point i
> glEndOcclusionQueryNV();
> }
>
> // evaluate visibility...
>
> Any hints?
A query for each point? That sounds fairly expensive. In that form there
is not support directly in OpenSG. You could use the OpenSG extension
handling methods if you wanted to, but other than that I don't see what
we could do to help. On the other hand, running through a bunch of
points doesn't seem that hard, your code up there is pretty much it,
unless I missed something. ;) You can use it with a PassiveWindow before
calling swap, and it should work just fine.
Yours
Dirk
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