Re: Projection matrix from two points

[Doug Lindholm <lind@xxxxxxxx>]

Java 3D comes with the javax.vecmath package which has lots of matrix 
manipulation methods.

http://java.sun.com/products/java-media/3D/forDevelopers/J3D_1_3_API/j3dapi/index.html

Doug

Bill Hibbard wrote:
> Hi Jeff,
>
>
> > We're playing around with flythroughs in the IDV and I am trying to figure
> > out (I am particularly brain dead trying to think in 3D) how to
> > create a projection matrix from two points, (x1,y1,z1) (x2,y2,z2)
> > such that the camera position is at the first point and the point of view
> > is towards the second point.
> >
> > Any ideas?
>
>
> Yeah, this stuff is a mess. Check out the article at:
>
>   http://www.makegames.com/3drotation/
>
> If you scroll down to "The Problem", there is an example
> of building a matrix if you are standing at the point
> (-1, 0, 1) and facing the point (-2, 0, 2). Note VisAD
> includes some simple matrix manipulation methods in
> visad/java3d/MouseBehaviorJ3D.java that may be useful.
>
> Please let us know if this continues to be a problem.
>
> Good luck,
> Bill

--
*----------------------------------------------------------------------*
| Doug Lindholm, Software Engineer          |  E-mail: lind@xxxxxxxx   |
| Unidata Program Center                    |   Phone: 303-497-8659    |
| UCAR Office of Programs                   |                          |
| P.O. Box 3000                             |     There's no place     |
| Boulder, Colorado 80307-3000              |        like $HOME        |
*----------------------------------------------------------------------*