Hi Gianni
Hi All,
I have a surface where a user can pick points. As suggested I used a Geode with
Geometry built with osg::PrimitiveSet::POINTS and verteices. Then I used
PointSprite to show an image on each point (but I think this is not really
important).
Now I need to drag points with the mouse. First of all I have to handle the mouse
move event to understand on which point the mouse is over. And now the problem.
Given the mouse is over one of the previously picked points, how can I get which
is the exact point of the Geometry from a osgUtil::PolytopeIntersector? The
Intersection object contains a nodePath that at least refers to the Geometry node,
not the single vertex/point. So I guess I have to loop over the actual picked
points coordinates (i.e. geometry->getVertexArray()) and calculate the distance
from the intersection.localIntersectionPoint. Is that right or is there a better
way to implement it?
The LineSegIntersector will retrieve the primitive index and the vertex
indices. There's some example in the OSG 3 Cookbook for this. This will
save you the trouble iterating. I guess there is something similar for
the polytope intersector, which at least will narrow down the number of
vertices to check on your end. I've implemented some "level"-terrain
tool where I used some of this stuff. Unfortunately I don't have the
source code here, so I could check on this later if you need some more info
Cheers
Sebastian
Cheers,
Gianni
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=61962#61962
_______________________________________________
osg-users mailing list
osg-users@lists.openscenegraph.org
http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
_______________________________________________
osg-users mailing list
osg-users@lists.openscenegraph.org
http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
