Hi Bruno,
There is simply no geometry in the scenegraph to intersect (or strictly
speaking there is only one drawable)
Instancing takes away the load from the CPU to the GPU,which on the
OSG-side means to put the instanced geometries into one drawable
containing the instancing information.
You could use two scenes representing the rendered scene using the
instances and another using multiple drawables for intersection
determination. If it is rather static, KD-Trees will help with
performance on the intersection-set.
Apart from this, you could overwrite the intersections of DrawArrays
with some method that takes instances into account, but that might get
tricky as there are many different ways to realize instancing. I'd go
with two scenes, using different node-masks for the intersection and the
"draw"-scene, as it is the easiest approach.
Cheers
Sebastian
Hi, Oliveira,
there maybe many reasons that why no intersection. I cannot give you
advise without more information. u can check about examples within OSG
source code, e.g. "osgintersection".
--
Cheers,
---
TianZJ
At 2017-01-03 17:55:02, "Bruno Oliveira"
<[email protected]
<mailto:[email protected]>> wrote:
Hi TianZJ, Thanks for the quick answer.
I checked the intersector, but intersector->getIntersections()
returns no intersections at all.
2017-01-03 9:32 GMT+00:00 tianzjyh <[email protected]
<mailto:[email protected]>>:
Hi, Oliveira,
You can check the intersections of your intersector(e.g.
LineSegmentIntersector::Intersection), and you will find they
contain an "osg::NodePath", which means the whole path of the
node(e.g. matrix transform nodes upon the drawable instance).
--
Cheers,
---
TianZJ
At 2017-01-03 16:58:16, "Bruno Oliveira"
<[email protected]
<mailto:[email protected]>> wrote:
Hello,
I'm implementing a draw instanced optimized scene. This is
for drawing a set of polygons.
Previously I was creating a drawable for each polygon, but
now I am using draw instancing. With one drawable per
polygon I can easily use osg intersectors for computing
scene intersections. But how can I perform scene
intersections with draw instanced objects and get, for
instance, intersected instance IDs?
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