added diffuse and specular colors to Material, switched all "private:" to "protected:"

git-svn-id: svn://anubis/fart/trunk@69 7f9b0f55-74a9-4bce-be96-3c2cd072584d

shapes/Plane.h

@@ -11,7 +11,7 @@ class Plane : public Shape
         IntersectList intersect(const Ray & ray);
         Vector getNormalAt(const Vector & pt);
 
-    private:
+    protected:
         double m_a, m_b, m_c, m_d;
 };
 

shapes/Sphere.h

@@ -11,7 +11,7 @@ class Sphere : public Shape
         IntersectList intersect(const Ray & ray);
         Vector getNormalAt(const Vector & pt);
 
-    private:
+    protected:
         double m_radius;
         double m_radius2;
 };