Hi Bill and others,
I am using VisAD for creating 3D object content. The object content
represents a terrain surface and is reused in my own Java3D based
3D-GIS-Service. The terrain consists of several parts. Thus I am
creating several objects of the class DEMFeatureProxy3D.
For each DEMFeatureProxy3D the method addSurfacePart is called once.
This method includes the VisAD code, which is creating my terrainpart
object:
// VisAD stuff
//
eastValues = RealType.getRealType("eastValues");
northValues = RealType.getRealType("northValues");
heightValues = RealType.getRealType("heightValues");
try {
domain_tuple = new RealTupleType(eastValues, northValues);
// Create a FunctionType (domain_tuple -> range_tuple);
func_en_h = new FunctionType(domain_tuple, heightValues);
domain_set
new Linear2DSet(
domain_tuple,
northMin,
northMax,
nRows,
eastMin,
eastMax,
nCols);
double[][] flat_samples = new double[1][nCols * nRows];
for (int c = 0; c < (nRows); c++) {
for (int r = 0; r < (nCols); r++) {
// dgm 1 x y z
flat_samples[0][c * nCols + r] = height[c
* nCols + r];
}
}
// Create a FlatField
// Use FlatField(FunctionType type, Set domain_set)
vals_ff = new FlatField(func_en_h, 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 Display and its maps
// A 2D display
display = new DisplayImplJ3D("display1");
// Create the ScalarMaps: latitude to XAxis, longitude to
YAxis and
// altitude to RGB and temperature to IsoContour
// Use ScalarMap(ScalarType scalar, DisplayRealType
display_scalar)
eastMap = new ScalarMap(eastValues, visad.Display.YAxis);
northMap = new ScalarMap(northValues,
visad.Display.XAxis);
heightMap = new ScalarMap(heightValues,
visad.Display.ZAxis);
eastMap.setRange(-1.0, 1.0);
northMap.setRange(-1.0, 1.0);
heightMap.setRange(-1.0, 1.0);
// Add maps to display
display.addMap(eastMap);
display.addMap(northMap);
display.addMap(heightMap);
// Create a data reference and set the FlatField as our
data
data_ref = new DataReferenceImpl("data_ref");
data_ref.setData(vals_ff);
renderer = new DefaultRendererJ3D();
// Add reference to display
GraphicsModeControl dispGMC
(GraphicsModeControl) display.getGraphicsModeControl();
//dispGMC.setScaleEnable(true);
//dispGMC.setPolygonMode(1);
dispGMC.setTextureEnable(false);
display.addReferences(renderer, data_ref);
// For DEM part indentification
display.setName(String.valueOf(partNumber));
display.addDisplayListener(listener);
} catch (VisADException ve) {
System.out.println("VisAd TupleType Exception");
} catch (RemoteException re) {
System.out.println("RemoteExcpetion");
}
Add the end the DisplayListener is attached.
I thought the method displayChanged is called when
VisAD is ready. In displayChanged I am looking for
the object content and transform so that I can reuse
the object geometry for my 3D-Service.
public synchronized void displayChanged(DisplayEvent e) {
// DEM-Konzept-Test multiple parts of DEM
WorldVolume wv2 = null;
if (e.getId() == DisplayEvent.TRANSFORM_DONE) {
DisplayImplJ3D displayInC = (DisplayImplJ3D) e.getDisplay();
Vector renderers = displayInC.getRenderers();
if (renderers.size() != 1) {
System.err.println(
"Error: Number of Renderes should be one! Num: "
+ renderers.size());
} else {
DefaultRendererJ3D rendererInC
(DefaultRendererJ3D) renderers.elementAt(0);
// Look for DEM part number
String pns = displayInC.getName();
Integer pnI = new Integer(pns);
int partNumber = pnI.intValue();
//System.out.println("partNumber " + partNumber);
BranchGroup branchGroup = rendererInC.getBranch();
try {
renderer.clearScene();
renderer.clearBranch();
display.destroy();
} catch (VisADException ex) {
System.err.println(ex);
} catch (RemoteException re) {
System.err.println(re);
}
if (branchGroup != null) {
branchGroup.detach();
Enumeration enum = branchGroup.getAllChildren();
while (enum.hasMoreElements()) {
...
}
}
}
}
}
Unfortunately sometimes I never come into the displayChanged method.
Say the terrain consists of 9 parts, thus I shoul reach the method
displayChanged 9 times, but sometimes I reach it only 2 times or
5 times. Thus some parts for my final terrain are missing.
Any ideas?
Thank for your help in advance.
Greetings Desiree
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Desiree Hilbring
Institut fuer Photogrammetrie und Fernerkundung
Universitaet Karlsruhe, Germany
email: hilbring@xxxxxxxxxxxxxxxxxxxx
# 0721 6083676
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