On Tue, 21 May 2002, Daniel Selman wrote:

> Noah,
>
> Lots of info! Some questions for you.
>
> 1. What is your front and back clip distance set to? How big are your maps?

FrontClipping distance: 5000.0 meters
BackClipping distance: (default for SimpleUniverse) 0.1 meters
The maps used in the images is: 4200m x 2000m (Max Elev. is 200m)

> 2. Have you updated you video driver?

I believe I have the most up to date driver for my development
hardware.  Additionally I've tried on multiple machines, one with ATI
hardware (a laptop), another with a GeForce4.  The results are the
same.  I've even tried using different version of Java3D.

> 3. Why apply a TextureAttributes to the Map, when it is not transparent?

I apply TransparencyAttributes to the Map (even when its not
transparent) because I can't seem to get the MapOverlay to show up at all
without doing so.  Both objects seem to require have a
TransparencyAttribute Object in order for the MapOverlay to show
up.  Perhaps this is a clue?

> The fact that the MapOverlap is not rendered looks like a depth sorting
> issue, which would possibly point to a depth buffer precision problem. Have
> you experimented with varying the Z-offset or using a PolygonAttributes
> offset?

I have put the MapOverlay and the Map in an ordered group.
Using the settings discussed in the previous e-mail, there appeared to be
no change regardless of render order.

I haven't player with the Z-offset using the PolygonAttributes yet.  I
play with both of these things more and get back to you.


> How about an OrderedGroup? Do you know that you cannot render
> overlayed transparent objects with any certainty without using the
> transparency depth sorting feature (1.3)?
>

I am unable to see either the Map or the MapOverlay in Java 1.3 by
default.  I haven't looked into this further yet.

> 4. Have you tried this on other machines / video cards / OSes?
>

I haven't tried different OS's but I have tried different Machines, and
different Video Cards, and different version of Java 1.2.1 including the
_03 and _04 versions for both OpenGL and DirectX.

> Sincerely,
>
> Daniel Selman
>
> Author - "Java 3D Programming"
> http://www.manning.com/selman
>

Noah Ternullo

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