added Color::yellow, finished shapes/Box, added a couple boxes to sample scene

git-svn-id: svn://anubis/fart/trunk@121 7f9b0f55-74a9-4bce-be96-3c2cd072584d

shapes/Box.cc

@@ -10,9 +10,9 @@ using namespace std;
 Box::Box(refptr<Vector> size)
 {
     m_size = *size;
-    m_size[0] = fabs(m_size[0]);
-    m_size[1] = fabs(m_size[1]);
-    m_size[2] = fabs(m_size[2]);
+    m_size[0] = fabs(m_size[0]) / 2.0;
+    m_size[1] = fabs(m_size[1]) / 2.0;
+    m_size[2] = fabs(m_size[2]) / 2.0;
 }
 
 Shape::IntersectList Box::intersect(const Ray & ray)

shapes/Shape.h

@@ -42,6 +42,7 @@ class Shape
 
 #include "Sphere.h"
 #include "Plane.h"
+#include "Box.h"
 
 #endif