Re: [visad] Strange rendering depending on axis range

Dear Ghansham,

Thank you for your response. The reason why I turned off the texture mapping is 
because when we visualize real mass spectrometry data in MZmine, the texture 
mapping does not work. I am not sure if this is due to the nature of the data 
or if it also some sort of bug.

Please check the attached screenshots from MZmine displaying a 1000x1000 
resolution mass spectrometry data set. One screenshot is with texture mapping 
off, the other one with texture mapping on (but shows almost nothing).

Best regards,

Tomas


________________________________________
From: visad-bounces@xxxxxxxxxxxxxxxx [visad-bounces@xxxxxxxxxxxxxxxx] on behalf 
of Ghansham Sangar [ghansham@xxxxxxxxxxxxxxx]
Sent: Sunday, May 20, 2012 4:01 PM
To: visad@xxxxxxxxxxxxxxxx
Subject: Re: [visad] Strange rendering depending on axis range

Hello Tomas,

Its really nice to hear that you are trying to use VisAD in new domains.
Well I just wanted to know if the VisadTest.java file why you are
disabling texture in
the GraphicsModeControl by doing this:
graphicsModeControl.setTextureEnable(false);
Is there any special motive/reason behind that?

I tried to display it as texture for the stated xMin, xMax values shown
in the snapshots that are sent with the mail.
The result is coming same as expected. You can just try at you end by doing:
graphicsModeControl.setTextureEnable(true);
Actually under the hood, if you disable texture, it uses geometry to
render the data.
But if you enable the texture it use Texture to display the data.


regards
Ghansham


On 05/19/2012 12:03 PM, visad-request@xxxxxxxxxxxxxxxx wrote:
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>     1. Strange rendering depending on axis range (Tomas Pluskal)
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> Message: 1
> Date: Sat, 19 May 2012 06:33:22 +0000
> From: Tomas Pluskal<pluskal@xxxxxxx>
> To: "visad@xxxxxxxxxxxxxxxx"<visad@xxxxxxxxxxxxxxxx>
> Subject: [visad] Strange rendering depending on axis range
> Message-ID:
>       <629163A7A829BF4FAA87AC64D7EC2C3F1A7837EC@xxxxxxxxxxxxxxxxxxxxxx>
> Content-Type: text/plain; charset="iso-8859-2"
>
> Dear VisAD developers,
>
> We are using VisAD for the visualization of mass spectrometry data as part of 
> the MZmine 2 framework (http://mzmine.sourceforge.net/).
>
> I found that sometimes the visualization is affected by the range of the 
> axes. When visualizing a narrow range of data, the plot shows some strange 
> artefacts such as lines.  After a bit of debugging, I managed to write a 
> short Java program that demonstrates the issue (attached as VisadTest.java)
>
> The program creates a simple Linear2DSet of 1000 x 1000 dimension. The Z 
> values are set to zero for the whole domain, therefore the visualization only 
> shows a flat plane. The strange thing is that depending on the range of the X 
> axis, the visualization is different (note that the resolution of the 
> Linear2DSet stays constant).
>
> The range of the X axis is defined in the program here:
>       double xMin = 100;
>       double xMax = 100.007;
>
> I have attached screenshots demonstrating the VisAD behavior as I change the 
> range of the X axis from 100-100.5 to 100-100.0005. Finer ranges show some 
> strange patterns instead of solid color. Is this behavior normal? I believe 
> the visualization should be exactly the same except the X axis label. Is this 
> a bug of VisAD?
>
> Best regards,
>
> Tomas
>
> PS: I am using the latest VisAD (Thu Mar 22 13:01:31 CDT 2012  Rev:5952), 
> running Java 1.6.0_31 on Mac OS X 10.7.4.
>
>
> ===============================================
> Tom?? Pluskal
> G0 Cell Unit, Okinawa Institute of Science and Technology Graduate University
> 1919-1 Tancha, Onna-son, Okinawa 904-0495, Japan
> TEL: +81-98-966-8684
> Fax: +81-98-966-2890
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