This fixes a number of things that are warnings in the Mac compiler....

core/cross/transform.cc

 /*
  * Copyright 2009, Google Inc.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 302 matching lines @@
   ShapeArray shapes;
   shapes.reserve(shape_array_.size());
   std::copy(shape_array_.begin(),
             shape_array_.end(),
             std::back_inserter(shapes));
   return shapes;
 }
 
 void Transform::SetShapes(const ShapeArray& shapes) {
   shape_array_.resize(shapes.size());
-  for (int i = 0; i != shapes.size(); ++i) {
+  for (unsigned int i = 0; i != shapes.size(); ++i) {
     shape_array_[i] = Shape::Ref(shapes[i]);
   }
 }
 
 void Transform::CreateDrawElements(Pack* pack, Material* material) {
   for (unsigned cc = 0; cc < child_array_.size(); ++cc) {
     child_array_[cc]->CreateDrawElements(pack, material);
   }
   for (unsigned ss = 0; ss < shape_array_.size(); ++ss) {
     shape_array_[ss]->CreateDrawElements(pack, material);
@@ skipping 33 matching lines @@
       }
     }
   }
 }
 
 ObjectBase::Ref ParamTransform::Create(ServiceLocator* service_locator) {
   return ObjectBase::Ref(new ParamTransform(service_locator, false, false));
 }
 
 }  // namespace o3d