Inquire the LocalToVWorld transform for the Shape3D, inquire your Points and
then transform them to VWorld coords.
Doug Gehringer
Sun Microsystems
> From: "Decker, Scott D" <[EMAIL PROTECTED]>
>
> Okay, I have a picking question
>
> I have a mesh that is composed of triangle strip arrays
> I need to find out which triangle area the user picks on
>
> I first do an intersection test with the shape3D
> PickObject.pickClosest(xpos,ypos,PickObject.USE_GEOMETRY);
>
> this returns a scenegraphpath (sgp)
>
> I also generate a PickRay with the branch root, canvas and the xpos, ypos
>
> Via the Shape3D I get it's TriangleStripArray
> then I get the number of triangles and loop like this
> for(i = 0; i < (vertex_counts/3); i++)
> {
> tri_strip.getCoordinate(first_vertex,tri[0]);
> tri_strip.getCoordinate(first_vertex + 1,tri[1]);
> tri_strip.getCoordinate(first_vertex + 2,tri[2]);
>
> first_vertex = first_vertex + 2;
>
> hit = Intersect.rayAndTriangle(pickRay,tri,0,dist);
>
> if (hit)
> System.out.println("hit a triangle");
>
>
>
> }
>
> I am going triangle by triangle right now
> The thing I am thinking about though, is that these triangle vertices are the
> original, non-transform vertices
> so, technically when I try the Intersect.rayAndTriangle pick, it is using the
> original vertices, but my view is all transformed to look at the data.
>
> So, to get those vertices transformed right, what must I do to get the
> transform?
> Can I use the transform from the SceneGraphPath to transform each vertice?
> Or, do I have to use some other Transform?
>
> Or, is there a better way to pick individual triangles?
>
> Thanks
> Scott
>
> Scott Decker
> Research Scientist
> Pacific Northwest National Labs
> [EMAIL PROTECTED]
>
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