Hi,
This is all very nice, but there's an element that makes my problem particular
and harder to solve: all the objects are loaded from a VRML file using a VRML97
loader. All the Shape3D's geometry objects don't have the ALLOW_INTERSECT
capability bit set (and it seems that I can't set it), so none will report a
pick using geometry.
If I were creating the objects and adding them to the universe "manually", all
your solutions would be perfect. Unfortunately... :)
> Great! I had overlooked the Shape3D.intersect method. This is the key!
> Once you have the picked Shape3D just intersect a ray generated from the
> mouse x,y with the shape, which gives you the distance. Use the ray origin
> and vector scaled by this distance. This makes it very easy...
>
> Shape3D pick(Canvas3D canvas, BranchGroup rootBranchGroup, int x, int y,
> Point3d pickedPoint)
> {
> PickObject po = new PickObject(canvas, rootBranchGroup);
> SceneGraphPath sgp = po.pickClosest(x, y, PickObject.USE_GEOMETRY);
> if(sgp!=null) {
> PickRay ray = (PickRay)po.generatePickRay(x,y);
> double distance[] = new double[1];
> Vector3d rayvect = new Vector3d();
> for( int i=sgp.nodeCount()-1 ; i>=0 ; i-- ) {
> if(sgp.getNode(i) instanceof Shape3D) {
> Shape3D pickedShape = (Shape3D)sgp.getNode(i);
> if(pickedShape.intersect(sgp, ray, distance)) {
> ray.get(pickedPoint, rayvect);
> rayvect.scale(distance[0]);
> pickedPoint.add(rayvect);
> return pickedShape;
> }
> }
> }
> }
> return null;
> }
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n:Bilodeau;Guillaume
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org:National Research Council Canada;Visual Information Technology
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email;internet:[EMAIL PROTECTED]
title:Software Engineer
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fn:Guillaume Bilodeau
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