Re: Reducing z axis range causes vectors to draw outside of cube.

• To: John Osborne <oz@xxxxxxxxxxxxx>
• Subject: Re: Reducing z axis range causes vectors to draw outside of cube.
• From: Bill Hibbard <billh@xxxxxxxxxxxxx>
• Date: Tue, 4 Mar 2003 13:51:38 -0600 (CST)

Hi John,

This is a mystery, since visad/examples/Test61.java tests this
situation (volume clipped in X, Y and Z by SelectRange) and
it works correctly.

I think your problem may relate to low resolution sampling
along the Z axis. The actual clip isn't to the exact value
passed to setRange(), but is to the nearest sample value.

Good luck,
Bill

On Tue, 4 Mar 2003, John Osborne wrote:

> I support 3D vector (u,v,w components) and volume visualizations from
> scientific data sets. I also allow users to change the range of the axes
> to reduce the density of the data plotted. This works fine for changes
> to the x and y axes but fails for changes to the z axis. Well it doesn't
> exactly fail--the z axis range is reduced correctly but the vectors and
> area of volume that should be clipped by the new axis range are still
> drawn *outside* the axes cube. To set the range of  an axis I do (for
> example):
>
> zMap.setRange(min, max);
> zRangeMap.setRange(min, max);
>
> Where zMap and zRangeMap are Scaler maps:
>
> zMap = new ScalarMap(Z, Display.ZAxis);
> zRangeMap = new ScalarMap(Z, Display.SelectRange);
>
> As I said, the above code works for the x and y axes--data outside the
> axis range are clipped from the 3D display. However, data outside the z
> axis range are NOT clipped from the display.
>
> Perplexed in Seattle,
>
> JO
>
>

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    • From: John Osborne