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]
=====================================================================
To subscribe/unsubscribe, send mail to [EMAIL PROTECTED]
Java 3D Home Page: http://java.sun.com/products/java-media/3D/
