next »

[dprakash]

I have created a sphere(triangle strip array) in my application and i am using Picking Library to pick it.I have made my class work like PickingLibraryTest class.
But my picking results are null.

After debugging i have found that in method pickAll(List<? super GroupNode> groups, View view, Ray3f pickRay, int button, AllPickListener l, Object userObject) of Picking Library.....


       
        SortableList<PickResult> intersecting = getPickCandidates(groups, view, pickRay, button);


       
        if (intersecting.size() > 0)
        {
            if (!isGeometryIgnored()) {
                intersecting = checkGeomIntersections(intersecting, pickRay, false);
            }
            intersecting.sort();
           
           

here getPickCandidates returns correct result but checkGeomIntersections sets the intersecting objects to 0.

So if i comment out checkGeomIntersections my picking works smooth.

Actually i cant understand how this method sets intersecting objects to 0.

[Marvin Fröhlich]

I don't have time to investigate this today. But checkGeomIntersections() takes all so called "pick candidates", which's bounds intersect the pick ray, and does a real triangles-pickray intersection test. The bounds test is only a cheap preselction, but it is not accurate. So if checkGeomIntersections() returns no result, your sphere is not actually picked (but the bounds are). I suppose, with "sets to 0" you mean, that the returned list is empty.

Well, I guess, your mouse is actually over the sphere. So it is a bug, that it is not picked. But is the geometry picked in the PickingLibraryTest?`(You should not use picking like in the PLTest, but better like in the ScheduledPickingTest)

btw. You can also eliminate the geom-pickray test by invoking

Code:

PickingLibrary.setGeometryIgnored( true );

Marvin