CustomEllipsoid: add the getHalfExtents() method

MinieLibrary/src/test/java/com/github/stephengold/shapes/custom/CustomEllipsoid.java

@@ -37,6 +37,7 @@ OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 import java.util.logging.Logger;
 import jme3utilities.Validate;
 import jme3utilities.math.MyMath;
+import jme3utilities.math.MyVector3f;
 
 /**
  * A collision shape for an axis-aligned ellipsoid.
@@ -150,6 +151,29 @@ public CustomEllipsoid(Vector3f halfExtents, float inertiaFactor) {
         setScale(scale);
     }
     // *************************************************************************
+    // new methods exposed
+
+    /**
+     * Copy the half extents of the ellipsoid.
+     *
+     * @param storeResult storage for the result (modified if not null)
+     * @return the unscaled half extent for each local axis (either storeResult
+     * or a new vector, not null, all components >0)
+     */
+    public Vector3f getHalfExtents(Vector3f storeResult) {
+        assert MyVector3f.isAllPositive(unscaledHe) : unscaledHe;
+
+        Vector3f result;
+        if (storeResult == null) {
+            result = unscaledHe.clone();
+        } else {
+            result = storeResult.set(unscaledHe);
+        }
+
+        return result;
+
+    }
+    // *************************************************************************
     // CustomConvexShape methods
 
     /**