Hi,
I've a scene with only a handful of Geodes (under 200).
If I wanted to detect which objects were "selected" within a 2D rectangle on
screen (think clicking, holding, dragging out a rectangle over the view) -
would a PolytopeIntersector be a good choice?
Code:
osgUtil::PolytopeIntersector *picker = new osgUtil::PolytopeIntersector(cf,
fmin(downX, lastX),
fmin(downY, lastY),
fmax(downX, lastX),
fmax(downY, lastY));
osgUtil::IntersectionVisitor iv(picker);
view->getCamera()->accept(iv);
if(picker->containsIntersections()) {
// do stuff
}
I ask because I've tried (using the above) - where downX/Y are filled in on
mouse down - and as soon as the selection encompasses a number of geodes it
really slows down, considerably (I'm doing this every time the mouse position
changes, e.g: ::DRAG). I suspect I'm doing something wrong / using the
polytope incorrectly perhaps?
Any pointers?
I'm considering using a nodemask to only examine the few things I need to test
for (ends up being about 12 quads). But wondering if I'm doing things
incorrectly from the outset...
Cheers,
Neil
------------------
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http://forum.openscenegraph.org/viewtopic.php?p=22664#22664
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