Re: [JAVA3D] Ortho example?

[Julian Scheid]

Hi Edgar,

I use the following code in my current app to project the XY plane
orthogonally onto the viewport.

void setupOrthoView(Canvas3D canvas) {
        // ortho-view parameters
        Point2d   shift=new Point(0.,0.);       // viewport shift along the X and Y
axis
        Dimension size=new Dimension(500,300);  // viewport width and height
                                                            // (=viewport scaling 
along the X and Y axis)
        // calculate view transformation
        Transform3D proj=new Transform3D();

proj.ortho(shift.x,shift.x+size.width,shift.y+size.height,shift.y,-200.,200.
);
                // ( because top and bottom are swapped, coordinates
                //    will start in the top left corner [y-down] in this view )

        // set view transformation
        View view=canvas.getView();
        view.setCompatibilityModeEnable(true); // seems necessary for setting
projection matrices
        view.setLeftProjection(proj);
        view.setRightProjection(proj);
}

in this example,
- all points (0.,0., ?)     will be projected into the top left pixel of the
viewport.
- all points (499.,299., ?) will be projected into the bottom right pixel of
the viewport.

(as long as they are in the visible Z-range -200 to +200)

Good luck,

-- Julian


-----Original Message-----
From: Discussion list for Java 3D API
[mailto:[EMAIL PROTECTED]]On Behalf Of Edgar Delgado Barbosa
Sent: Tuesday, February 08, 2000 1:13 PM
To: [EMAIL PROTECTED]
Subject: [JAVA3D] Ortho example?


I need some ortho view example.
I'm trying to code something with ortho method, but with no success.
Also found some kind of bug: an inconsistent transform matrix.

Thanks
Edgar

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