Re: Beginner question

Hi Carsten,

You are right. The default for a topographical type
display is to texture map the colors onto a reduced
resolution surface geometry. The purpose is efficiency.
You can prevent this by:

  dispGMC.setTextureEnable(false);

Good luck,
Bill

On Mon, 10 Jul 2006, Carsten Friedrich wrote:

> Hi,
>
> I'm trying to display a field of data samples (x,y)->z in 3D, pretty much
> like the tutorial section 4. My field is a bit bigger, not unrealistically
> big though: 365 x 100 samples.
>
> When I try to render this, some of the peaks are missing. It seems to me
> like the renderer constructs the surface using only every n-th data point
> from my field and interpolates the rest (although actual values would
> exist). This assumption is supported by the program below which fills the
> field with random data: If every peak was drawn correctly no peak would have
> several colour patches in it.
>
> How can I get every peak drawn? (Btw iso-contour map achieves this, but
> limits me in other respects).
>
> Thanks for your help
>
> Carsten
>
> Sample program (contains some unnecessary code, please ignore that):
>
> /*
>  VisAD Tutorial
>  Copyright (C) 2000 Ugo Taddei
>  */
>
> package tutorial.s4;
>
> // Import needed classes
>
> import java.awt.*;
> import java.rmi.*;
> import java.sql.*;
>
> import javax.swing.*;
>
> import com.dtecht.server.database.*;
>
> import visad.*;
> import visad.java3d.*;
> import visad.util.*;
>
> /**
>  * VisAD Tutorial example 4_01 Like example 4_02 but using a ContourWidget
> We
>  * have the functions altitude = h(latitude, longitude) temperature
>  * f(latitude, longitude)
>  *
>  * represented by the MathType ( (latitude, longitude) -> (altitude,
> temperature ) )
>  * Map the altitude to ZAxis and temperature to RGB Run program with "java
>  * P4_02"
>  */
>
> public class P4_02_1 {
>
>
>       // The ContourWidget
>       public P4_02_1(String[] args) throws RemoteException,
> VisADException,
>                       SQLException {
>
>               RealType day = //RealType.getRealType("day");//
>                       RealType.getRealType("day",SI.meter,null);
>
>               RealType age = RealType.getRealType("age",SI.meter,null);
>
>               RealTupleType domain_tuple = new RealTupleType(day, age);
>
>               RealType stddev
> RealType.getRealType("stddev",SI.meter,null);
>               RealType avg = RealType.getRealType("avg",SI.meter,null);
>
>               RealTupleType range_tuple = new RealTupleType(avg, stddev);
>
>               // Create a FunctionType (domain_tuple -> range_tuple )
>               // Use FunctionType(MathType domain, MathType range)
>
>               FunctionType func_domain_range = new
> FunctionType(domain_tuple, range_tuple);
>
>               int NCOLS = 100;
>               int NROWS = 365;
>
>               float[][] flat_samples = new float[2][NCOLS * NROWS];
>
>               for(int i=0; i< NCOLS*NROWS;i++) {
>                       flat_samples[0][i]= (float) Math.random();
>                       flat_samples[1][i]= flat_samples[0][i];
>               }
>
>               // Create Display and its maps
>
>               // A 2D display
>
>               DisplayImplJ3D display = new DisplayImplJ3D("display1");
>
>               // Get display's graphics mode control and draw scales
>
>               GraphicsModeControl dispGMC = (GraphicsModeControl) display
>                               .getGraphicsModeControl();
>               dispGMC.setScaleEnable(true);
>
>               // Create the ScalarMaps: latitude to YAxis, longitude to
> XAxis and
>               // altitude to ZAxis and temperature to RGB
>               // Use ScalarMap(ScalarType scalar, DisplayRealType
> display_scalar)
>
>               ScalarMap latMap = new ScalarMap(day, Display.YAxis);
>               ScalarMap lonMap = new ScalarMap(age, Display.XAxis);
>
>               // Add maps to display
>
>               display.addMap(latMap);
>               display.addMap(lonMap);
>
>               // altitude to z-axis and temperature to color
>
>               ScalarMap altZMap = new ScalarMap(avg, Display.ZAxis);
>               display.addMap(altZMap);
>
>               ScalarMap tempRGBMap = new ScalarMap(stddev, Display.RGB);
>               display.addMap(tempRGBMap);
>
>
>
>               Set domain_set = new Integer2DSet(domain_tuple, NROWS,
> NCOLS);
>       //      Set domain_set = new Linear2DSet(domain_tuple, 0, 364,
> NROWS, 0, 99, NCOLS);
>               FlatField vals_ff = new FlatField(func_domain_range,
> domain_set);
>
>               // ...and put the values above into it
>
>               // Note the argument false, meaning that the array won't be
> copied
>
>               vals_ff.setSamples(flat_samples, false);
>
>               // Create a data reference and set the FlatField as our data
>
>               DataReferenceImpl data_ref = new
> DataReferenceImpl("data_ref");
>
>               data_ref.setData(vals_ff);
>
>               // Add reference to display
>
>               display.addReference(data_ref);
>
>               // Create application window and add display to window
>
>               JFrame jframe = new JFrame("VisAD Tutorial example 4_02");
>               jframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
>               jframe.getContentPane().setLayout(new BorderLayout());
>               jframe.getContentPane().add(display.getComponent(),
> BorderLayout.CENTER);
>
>               jframe.setSize(1200, 800);
>               jframe.setVisible(true);
>
>       }
>
>       public static void main(String[] args) throws RemoteException,
> VisADException {
>               try {
>                       new P4_02_1(args);
>               } catch (SQLException e) {
>                       // TODO Auto-generated catch block
>                       e.printStackTrace();
>               }
>       }
>
> } // end of Visad Tutorial Program 4_01
>
> --
> Carsten Friedrich
> Dtecht Pty Limited
> Suite 1303, 33 Bligh Street, Sydney NSW 2000
> Tel: +61 2 9220 8204
> Fax: +61 2 9238 0044   http://www.dtecht.com
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