More GriddedNDSet Questions

[Kenneth Evans]

>> If you're ready to compile VisAD from its source.

 

I thought I was and have done that before.  There are two problems:

 

1. I am on Windows and when I extracted the new visad_src.jar, there seems
to be no Makefile.WinNT in the visad directory.

 

2. I recall it didn't make the visad.jar before.  The way I am set up now,
it would be easy to replace the JAR file but not easy to set the build path.
(The reason is that it is set up as an Eclipse plug-in.)  So how do I make
the JAR.

 

The third problem is that I am leaving for Germany and France on Friday (and
would like to have this working).  Consequently, my time is limited for the
trial and error approach.

 

I can also do Cygwin builds, but I recall that didn't work before.

 

Thanks for any help,

 

        -Ken

  _____  

From: owner-visad at unidata.ucar.edu [mailto:owner-visad at unidata.ucar.edu] On
Behalf Of Bill Hibbard
Sent: Sunday, April 15, 2007 3:17 PM
To: Kenneth Evans, Jr.; Visad
Subject: RE: More GriddedNDSet Questions

 

Ken,

All the evidence you present says that the system is using
texture mapping with your Linear2DSet and not using texture
mapping with your Gridded2DDoubleSet (the slowness is
consistent with not using texture mapping). If you're ready to
compile VisAD from its source, you could uncomment the
print statements for the computation of the isTextureMap
and curvedTexture flags, in the ShadowFunctionOrSetType.java
file in the visad package. Uncomment two sets of print
statements, between (at least in the old version of source
on my home machine) lines 453-477 and lines 713-733.
It would be a good idea to eliminate all displayed data
except the Field of interest, so you don't confuse with the
print output of other data.

Feel free to send the results to the list, and we'll try to
figure out what's happening.

Good luck,
Bill

----- Original Message -----
From: "Kenneth Evans, Jr." 
To: Visad 
Subject: RE: More GriddedNDSet Questions
Date: Sat, 14 Apr 2007 12:01:57 -0500




Bill,

 

I am attaching a picture of what I get with the Gridded2DDouble set.  They
are triangles and don't extend beyond the plot range, whereas with the
Linear2D set, they are pixels and extend .5 pixel beyond the plot boundary
(presumably TextureMaps).  Moreover, the display is verrry slow in the
Gridded2DDouble case.  The lines of code that are different in the two cases
are:

 

    // Create the domain set

    if(xVals2D == null && yVals2D == null) {

      // Define a linear domain set with the indices

      domainSet = new Linear2DSet(xMin, xMax, nX, yMin, yMax, nY);

      System.out.println("Linear2DSet");

    } else {

      xVals1D = new double[1][nX * nY];

      yVals1D = new double[1][nX * nY];

      xVals1D[0] = VUtils.convert2DArrayTo1DArray(xVals2D, nY, nX);

      yVals1D[0] = VUtils.convert2DArrayTo1DArray(yVals2D, nY, nX);

      domainSet = new Gridded2DDoubleSet(domainType, new double[][] {

        xVals1D[0], yVals1D[0]}, nX, nY);

      System.out.println("Gridded2DDoubleSet");

    }

 

This is from a generic 2D plot class.  If you give it x and y values it uses
the Gridded2DDoubleSet, otherwise the Linear2DSet.  I can send the whole
file, if necessary.  The domainTypes are defined:

 

    // Define types

    xType = RealType.getRealType(xLabel, null, null);

    yType = RealType.getRealType(yLabel, null, null);

    RealType[] domainTypes = new RealType[2];

    domainTypes[0] = xType;

    domainTypes[1] = yType;

    domainType = new RealTupleType(domainTypes);

 

The fact that it is slow is more important to me than that is using
triangles.

 

gmc.getTextureEnable returns true in both cases.  I don't explicitly set it.

 

The VisAD version is the Jan 07 version.

 

Thanks,

 

            -Ken

 

  _____  

From: owner-visad at unidata.ucar.edu [mailto:owner-visad at unidata.ucar.edu] On
Behalf Of Bill Hibbard
Sent: Monday, April 09, 2007 5:46 PM
To: Kenneth Evans, Jr.; Visad
Subject: RE: More GriddedNDSet Questions

 

Hi Ken,

Pairs of triangles indicate that the system is not using curved
texture maps. I don't understand why it would use square
texture maps with your LinearSet and not use curved texture
maps with your GriddedSet, unless (according to my reading
of the code in VisAD) you are making transparent surfaces.
I doubt that sending an image will help.

Good luck,
Bill

     What I see is pairs of triangles when I zoom in.  That is probably what
a curved texture map looks like?  I can send an image if that would help,
but I don't think I am seeing anything unusual.  It's just it is different
when using a Gridded2DSet than when using a Linear2DSet, even though the
grid data is equivalent.



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