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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