SDK:

- add configurable timeout for navmesh generator

git-svn-id: https://jmonkeyengine.googlecode.com/svn/trunk@8996 75d07b2b-3a1a-0410-a2c5-0572b91ccdca

sdk/jme3-navmesh-gen/src/com/jme3/gde/nmgen/NavMeshGenerator.java

@@ -17,6 +17,8 @@ import java.nio.FloatBuffer;
 import org.critterai.nmgen.IntermediateData;
 import org.critterai.nmgen.NavmeshGenerator;
 import org.critterai.nmgen.TriangleMesh;
+import org.openide.DialogDisplayer;
+import org.openide.NotifyDescriptor;
 
 public class NavMeshGenerator implements Savable {
 
@@ -37,8 +39,8 @@ public class NavMeshGenerator implements Savable {
     private int maxVertsPerPoly = 6;
     private float contourSampleDistance = 25;
     private float contourMaxDeviation = 25;
-    
     private IntermediateData intermediateData;
+    private int timeout = 10000;
 
     public NavMeshGenerator() {
     }
@@ -89,7 +91,8 @@ public class NavMeshGenerator implements Savable {
             indices[i] = ib.get(i);
         }
 
-        TriangleMesh triMesh = nmgen.build(positions, indices, intermediateData);
+
+        TriangleMesh triMesh = buildNavMesh(positions, indices, intermediateData);
         if (triMesh == null) {
             return null;
         }
@@ -106,6 +109,34 @@ public class NavMeshGenerator implements Savable {
         return mesh2;
     }
 
+    private TriangleMesh buildNavMesh(float[] positions, int[] indices, IntermediateData intermediateData) {
+        MeshBuildRunnable runnable = new MeshBuildRunnable(positions, indices, intermediateData);
+        try {
+            execute(runnable, timeout);
+        } catch (TimeoutException ex) {
+            DialogDisplayer.getDefault().notifyLater(new NotifyDescriptor.Message("NavMesh Generation timed out."));
+        }
+        return runnable.getTriMesh();
+    }
+
+    private static void execute(Thread task, long timeout) throws TimeoutException {
+        task.start();
+        try {
+            task.join(timeout);
+        } catch (InterruptedException e) {
+        }
+        if (task.isAlive()) {
+            task.interrupt();
+            throw new TimeoutException();
+        }
+    }
+
+    private static void execute(Runnable task, long timeout) throws TimeoutException {
+        Thread t = new Thread(task, "Timeout guard");
+        t.setDaemon(true);
+        execute(t, timeout);
+    }
+
     public Mesh terrain2mesh(Terrain terr) {
         float[] heights = terr.getHeightMap();
         int length = heights.length;
@@ -302,6 +333,14 @@ public class NavMeshGenerator implements Savable {
         this.useConservativeExpansion = useConservativeExpansion;
     }
 
+    public int getTimeout() {
+        return timeout;
+    }
+
+    public void setTimeout(int timeout) {
+        this.timeout = timeout;
+    }
+    
     public void write(JmeExporter ex) throws IOException {
         OutputCapsule oc = ex.getCapsule(this);
         oc.write(cellSize, "cellSize", 1f);
@@ -341,4 +380,34 @@ public class NavMeshGenerator implements Savable {
         contourSampleDistance = ic.readFloat("contourSampleDistance", 25);
         contourMaxDeviation = ic.readFloat("contourMaxDeviation", 25);
     }
+
+    private class MeshBuildRunnable implements Runnable {
+
+        private float[] positions;
+        private int[] indices;
+        private IntermediateData intermediateData;
+        private TriangleMesh triMesh;
+
+        public MeshBuildRunnable(float[] positions, int[] indices, IntermediateData intermediateData) {
+            this.positions = positions;
+            this.indices = indices;
+            this.intermediateData = intermediateData;
+        }
+
+        @Override
+        public void run() {
+            triMesh = nmgen.build(positions, indices, intermediateData);
+        }
+
+        public TriangleMesh getTriMesh() {
+            return triMesh;
+        }
+    }
+
+    public static class TimeoutException extends Exception {
+
+        /** Create an instance */
+        public TimeoutException() {
+        }
+    }
 }

sdk/jme3-navmesh-gen/src/com/jme3/gde/nmgen/wizard/NewNavMeshWizardAction.java

@@ -73,6 +73,7 @@ public final class NewNavMeshWizardAction extends AbstractNewSpatialWizardAction
 
         GeometryBatchFactory.mergeGeometries(findGeometries(rootNode, new LinkedList<Geometry>(), generator), mesh);
         Mesh optiMesh = generator.optimize(mesh);
+        if(optiMesh == null) return null;
 
         final Geometry navMesh = new Geometry("NavMesh");
         Material material = new Material(pm, "Common/MatDefs/Misc/Unshaded.j3md");