Re: Oops (Re: polyhedral cells)

Any chance I could get another helpful nudge?

Here's my embryonic - trying to display a single hexahedral cell (as 5
tetrahedra) via Irregular3DSet (this will be the case, in general).
All I see is the reference box when I run this.  I'd like to display the
grid itself, then later scalar data over the grid.


// import needed classes
import visad.*;
import visad.java3d.DisplayImplJ3D;
import visad.util.VisADSlider;
import java.rmi.RemoteException;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class hex {

  // type 'java cbay' to run this application
  public static void main(String args[])
         throws VisADException, RemoteException, IOException {

    // Define vertices
    float vtx[][] = new float[3][8];
    int k=0;
    // front face
    vtx[0][k]= -0.7f; vtx[1][k]= -0.3f; vtx[2][k]= -0.5f; k++;
    vtx[0][k]=  0.7f; vtx[1][k]= -0.3f; vtx[2][k]= -0.5f; k++;
    vtx[0][k]=  0.7f; vtx[1][k]=  0.3f; vtx[2][k]= -0.5f; k++;
    vtx[0][k]= -0.7f; vtx[1][k]=  0.3f; vtx[2][k]= -0.5f; k++;

    // back face
    vtx[0][k]= -0.7f; vtx[1][k]= -0.3f; vtx[2][k]=  0.5f;  k++;
    vtx[0][k]=  0.7f; vtx[1][k]= -0.3f; vtx[2][k]=  0.5f;  k++;
    vtx[0][k]=  0.7f; vtx[1][k]=  0.3f; vtx[2][k]=  0.5f;  k++;
    vtx[0][k]= -0.7f; vtx[1][k]=  0.3f; vtx[2][k]=  0.5f;  k++;

    // Define tetrahedra
//    int numTetra = 5 * numHexCells;
    int numTetra = 5;
    int tetra[][] = new int[numTetra][4];
    tetra[k][0]=0; tetra[k][1]=2; tetra[k][2]=7; tetra[k][3]=3;  k++;
    tetra[k][0]=0; tetra[k][1]=2; tetra[k][2]=5; tetra[k][3]=7;  k++;
    tetra[k][0]=0; tetra[k][1]=5; tetra[k][2]=1; tetra[k][3]=2;  k++;
    tetra[k][0]=0; tetra[k][1]=5; tetra[k][2]=4; tetra[k][3]=7;  k++;
    tetra[k][0]=7; tetra[k][1]=2; tetra[k][2]=6; tetra[k][3]=5;  k++;

    Irregular3DSet set = new Irregular3DSet(
                           MathType.stringToType("Set(x, y, z)"),
                           null, // CoordinateSystem
                           null, // Unit[]
                           null, // ErrorEstimate[]
                           new DelaunayCustom(vtx, tetra) );

    DataReferenceImpl ref = new DataReferenceImpl("set");
    ref.setData(set); // link set to ref

    // create a Display using Java3D
    DisplayImplJ3D display = new DisplayImplJ3D("set display");
    RealTupleType tuple = ((SetType) set.getType()).getDomain();
    RealType x = (RealType) tuple.getComponent(0);
    RealType y = (RealType) tuple.getComponent(1);
    RealType z = (RealType) tuple.getComponent(2);
    display.addMap(new ScalarMap(x, Display.XAxis));
    display.addMap(new ScalarMap(y, Display.YAxis));
    display.addMap(new ScalarMap(z, Display.ZAxis));
    display.addReference(ref); // link ref to display

    // create JFrame (i.e., a window) for display and slider
    JFrame frame = new JFrame("Hex Cell");
    frame.addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent e) {System.exit(0);}

    // create JPanel in JFrame
    JPanel panel = new JPanel();
    panel.setLayout(new BoxLayout(panel, BoxLayout.Y_AXIS));

    // add slider and display to JPanel
//    panel.add(slider);

    // set size of JFrame and make it visible
    frame.setSize(400, 400);

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