I agree with your comments. I will be the first to admit that I am not a
professional Java3D developer but right off hand I don't know how to access the
depth of the z-buffer at the desired x-y location. It seems to me that without
it you will have to run down the line of sight until you find the first object,
which is what I was trying to explain. The z-buffer data could give you that
easily. Does anyone out there know how to get the data?
Gary
[EMAIL PROTECTED] wrote:
> > Hi,
> > The problem is that the redering process necessarily
> > looses information
> > in the conversion from 3D to 2D and there is no way to go back and
> > explicitly reconstruct it.
>
> Forgive my ignorance, I've never written a line of Java 3D,
>
> All you need is the inverted projection matrix,
> the screen coordinates, and the
> depth value from the z-buffer to reconstruct the world
> coordinates of your object. You'll lose some precision
> depending on your depth range, but for close objects
> you'll get pretty good values. Does java 3D not provide
> access to that information?
>
> Thanks,
>
> Vann
> --
> Vann Hasty
> Real-time rendering
> Evans & Sutherland
>
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