GridTerrain problem

Troubleshooting General Help
1

Hi, I’m currently having hard problems to get ridTerrain to work with my (finally) generated Heighmaps, actually there seems to be a problem with loading the Images, but I’m not sure why. Png is set to 16bit grayscale when exporting (also gimp is reporting this).



17.06.2011 00:14:45 com.jme3.terrain.heightmap.ImageBasedHeightMapGrid getHeightMapAt

INFO: Loading heightmap from file: heighmap_x0y0.png

17.06.2011 00:14:45 com.jme3.terrain.geomipmap.TerrainGrid updateChildrens

SCHWERWIEGEND: null

java.util.concurrent.ExecutionException: java.lang.ClassCastException: [S cannot be cast to [B<br /> at java.util.concurrent.FutureTask$Sync.innerGet(Unknown Source)<br /> at java.util.concurrent.FutureTask.get(Unknown Source)<br /> at com.jme3.terrain.geomipmap.TerrainGrid.updateChildrens(TerrainGrid.java:209)<br /> at com.jme3.terrain.geomipmap.TerrainGrid.initialize(TerrainGrid.java:123)<br /> at online.newhorizons.l3dt.Test.simpleInitApp(Test.java:95)<br /> at com.jme3.app.SimpleApplication.initialize(SimpleApplication.java:223)<br /> at com.jme3.system.lwjgl.LwjglAbstractDisplay.initInThread(LwjglAbstractDisplay.java:124)<br /> at com.jme3.system.lwjgl.LwjglAbstractDisplay.run(LwjglAbstractDisplay.java:200)<br /> at java.lang.Thread.run(Unknown Source)<br /> Caused by: java.lang.ClassCastException: [S cannot be cast to [B<br /> at sun.awt.image.ByteInterleavedRaster.getDataElements(Unknown Source)<br /> at com.jme3.terrain.heightmap.Grayscale16BitHeightMap.load(Grayscale16BitHeightMap.java:56)<br /> at com.jme3.terrain.heightmap.Grayscale16BitHeightMap.load(Grayscale16BitHeightMap.java:43)<br /> at com.jme3.terrain.heightmap.ImageBasedHeightMapGrid.getHeightMapAt(ImageBasedHeightMapGrid.java:66)<br /> at com.jme3.terrain.geomipmap.TerrainGrid$UpdateQuadCache.run(TerrainGrid.java:62)<br /> at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)<br /> at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)<br /> at java.util.concurrent.FutureTask.run(Unknown Source)<br /> at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)<br /> at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)<br /> … 1 more<br /> 17.06.2011 00:14:45 com.jme3.scene.Node attachChild<br /> INFO: Child (terrain) attached to this node (Root Node)<br /> 17.06.2011 00:14:45 com.jme3.app.Application handleError<br /> SCHWERWIEGEND: Uncaught exception thrown in Thread[LWJGL Renderer Thread,5,main]

java.lang.NullPointerException

at com.jme3.terrain.geomipmap.TerrainGrid.update(TerrainGrid.java:137)

at com.jme3.terrain.geomipmap.TerrainLodControl.controlUpdate(TerrainLodControl.java:98)

at com.jme3.scene.control.AbstractControl.update(AbstractControl.java:86)

at com.jme3.scene.Spatial.runControlUpdate(Spatial.java:494)

at com.jme3.scene.Spatial.updateLogicalState(Spatial.java:612)

at com.jme3.scene.Node.updateLogicalState(Node.java:151)

at com.jme3.scene.Node.updateLogicalState(Node.java:158)

at com.jme3.app.SimpleApplication.update(SimpleApplication.java:249)

at com.jme3.system.lwjgl.LwjglAbstractDisplay.runLoop(LwjglAbstractDisplay.java:144)

at com.jme3.system.lwjgl.LwjglDisplay.runLoop(LwjglDisplay.java:173)

at com.jme3.system.lwjgl.LwjglAbstractDisplay.run(LwjglAbstractDisplay.java:218)

at java.lang.Thread.run(Unknown Source)



http://wiki.nh-game.net/upload/en/2011/6/gimpheigmap-17001659.png

Also a small but important suggestion



Index: src/terrain/com/jme3/terrain/geomipmap/TerrainGrid.java

===================================================================

— src/terrain/com/jme3/terrain/geomipmap/TerrainGrid.java (revision 7640)

+++ src/terrain/com/jme3/terrain/geomipmap/TerrainGrid.java (working copy)

@@ -119,7 +119,10 @@

}

public void initialize(Vector3f location) {

  •    Vector3f camCell = this.getCell(location);<br />

  •    if(this.material == null){<br />

  •    	throw new RuntimeException("Material must be set prior to call of initialize");<br />

  •    }<br />

  •   Vector3f camCell = this.getCell(location);<br />

this.updateChildrens(camCell);

for (TerrainGridListener l : this.listeners.values()) {

l.gridMoved(camCell);





Cause if you first call initalize then set the Material you get a crash at some inner Quad Class, leaving you somewhat in confusion what actualy went wrong.

2

Hey, why the output is showing class cast exceptions?

3

Yes, that is exactly what I’m wondering about, since I don’t see what might cause it.

4

The exception occours into the updateChildrens method. Debug it and enter into methods to find the wrong class cast.

5

Well I found the reason, at the point where the image is converted to the hieghmap 2d array there is a cast to a short array. I don’t fully understand why i get there a error, however i found out that it dissapears, if I export the heighmap as 8bit grayscale.(even though it is loaded into a 16bitgrayscale heighmap)

6

this exception is really strange… It seems to me, that it tried to convert short array to byte array. But I do not use bytes anywhere. And short is really 16 bit. :confused: I’m creating the test images by simply filling a BufferedImage. Could you please attach a problematic image, so i can take a look at it?



I’ll make the proposed addition :slight_smile: