Bounding box fixes.

gapic/src/main/com/google/gapid/glviewer/Geometry.java

@@ -44,10 +44,7 @@ public Geometry(Model model, boolean zUp) {
   }
 
   public BoundingBox getBounds() {
-    if (model != null) {
-      return model.getBounds();
-    }
-    return BoundingBox.INVALID;
+    return (model == null) ? new BoundingBox() : model.getBounds();
   }
 
   public Renderable asRenderable(DisplayMode displayMode) {

gapic/src/main/com/google/gapid/glviewer/geo/BoundingBox.java

@@ -24,13 +24,21 @@
  * Bounding box of a model aligned to the standard cartesian directions.
  */
 public class BoundingBox {
-  public static final BoundingBox INVALID = new BoundingBox();
-
   public final double[] min =
       new double[] { Double.POSITIVE_INFINITY, Double.POSITIVE_INFINITY, Double.POSITIVE_INFINITY };
   public final double[] max =
       new double[] { Double.NEGATIVE_INFINITY, Double.NEGATIVE_INFINITY, Double.NEGATIVE_INFINITY };
 
+  public BoundingBox() {
+  }
+
+  public BoundingBox copy() {
+    BoundingBox r = new BoundingBox();
+    System.arraycopy(min, 0, r.min, 0, 3);
+    System.arraycopy(max, 0, r.max, 0, 3);
+    return r;
+  }
+
   public void add(VecD vec) {
     add(vec.x, vec.y, vec.z);
   }
@@ -40,20 +48,6 @@ public void add(double x, double y, double z) {
     VecD.max(max, x, y, z);
   }
 
-  public BoundingBox() {
-    this(Double.MAX_VALUE, Double.MAX_VALUE, Double.MAX_VALUE,
-        Double.MIN_VALUE, Double.MIN_VALUE, Double.MIN_VALUE);
-  }
-
-  public BoundingBox(double minX, double minY, double minZ, double maxX, double maxY, double maxZ) {
-    min[0] = minX;
-    min[1] = minY;
-    min[2] = minZ;
-    max[0] = maxX;
-    max[1] = maxY;
-    max[2] = maxZ;
-  }
-
   /**
    * @return a matrix that will center the model at the origin and scale it to the given size.
    */