chage the type for the .equals

Author: madhephaestus

src/main/java/eu/mihosoft/vrl/v3d/Vector3d.java

@@ -430,15 +430,18 @@ public String toString() {
      */
     @Override
     public boolean equals(Object obj) {
-        return test(obj,Plane.EPSILON_Point);
+    	if (!Vector3d.class.isInstance(obj)) {
+            return false;
+        }
+        return test((Vector3d)obj,Plane.EPSILON_Point);
     }
 
     double distance(Vector3d v) {
     	Vector3d diff = v.minus(this);
     	return diff.magnitude();
     }
 
-	public boolean test(Object obj, double epsilon) {
+	public boolean test(Vector3d obj, double epsilon) {
 		if (obj == null) {
             return false;
         }