I looked first, then did a search of my whole hard drive, IntersectTest.java was
no where to be found. PickTest was the closest directory and the Picking done
here are PickRotateBehavior, PickTranslateBehavior, and PickZoomBehavior, none
of which appear to define the picked coordinate.
My attempt to use Intersect came from the Java3D tutorial which again didn't go
into detail on identifying the coordinate of the actual Intersection point.
Mauro Fabozzi wrote:
> See how "Intersect" works looking for the example IntersectTest.java into
> the PickingTest directory (see the demo directory generated by the Java3d
> 1.2 setup program).
>
> By, Mauro.
>
> ----- Original Message -----
> From: <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Sent: Monday, May 29, 2000 1:30 PM
> Subject: Re: [JAVA3D] PickRay and point of intersection
>
> I had a similar problem, and used the same method you have below. The
> algorithm
> is correct if you assume the intersect distance is placed in dist[0],
> however
> this may not be the case. The documentation on Intersect doesn't define what
> dist[0] does(why is it an array?), or what value is placed back in it if an
> intersect returns true. The value of dist[0] is changed, but I have not been
> able to make sense out of the values placed in it.
>
> In my case I had to write my own ray-triangle intersector to get results I
> could trust.
>
> Yu Kui Zhou wrote:
>
> > Given Intersect.rayAndTriangle(myRay, coords, 3, dist)) = true,
> > I wnat to find the point of intersection - interPoint. I tried
> > the following code to do the job
> >
> > file://dist[0]-the distance between the origin of the
> > file://myRay and the point of intersection.
> >
> > Point3d interPoint = new Point3d();
> > Vector3d di = new Vector3d();
> > myRay.get(interPoint, di);//(origin,direction vector)
> > di.normalize();//normalising the direction vector
> > di.scale(dist[0]); file://di = dist[0]*di
> > interPoint.add(di);//interPoint=di+interPoint
> >
> > The result derived however was wrong. I really have no idea why
> > is that. I appreciate if you can help.
> >
> > Zhou
> >
> > Email: [EMAIL PROTECTED]
> > fax +61-2-6249 0506
> >
> >
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