Beginner question

[Bill Hibbard]

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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