More GriddedNDSet Questions

[Bill Hibbard]

 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.



  --

  [IMAGE]

  << Gridded2DSet.Triangles.png >>
-------------- next part --------------
An embedded and charset-unspecified text was scrubbed...
Name: not available
Url: http://mailman.unidata.ucar.edu/mailing_lists/archives/visad/attachments/20070415/0b98c2a7/attachment.ksh