added operators +, - to Vector, added inverse transform instance variable to shapes/Shape, changed Sphere to use its inverse transform when calculating intersections and normals, removed simplistic lighting from main/Scene

git-svn-id: svn://anubis/fart/trunk@47 7f9b0f55-74a9-4bce-be96-3c2cd072584d

util/Vector.cc

@@ -61,3 +61,21 @@ Vector operator*(const Vector & v1, const Vector & v2)
     result[2] = v1[0] * v2[1] - v1[1] * v2[0];
     return result;
 }
+
+Vector operator+(const Vector & v1, const Vector & v2)
+{
+    Vector result;
+    result[0] = v1[0] + v2[0];
+    result[1] = v1[1] + v2[1];
+    result[2] = v1[2] + v2[2];
+    return result;
+}
+
+Vector operator-(const Vector & v1, const Vector & v2)
+{
+    Vector result;
+    result[0] = v1[0] - v2[0];
+    result[1] = v1[1] - v2[1];
+    result[2] = v1[2] - v2[2];
+    return result;
+}

util/Vector.h

@@ -22,5 +22,7 @@ class Vector
 std::ostream & operator<<(std::ostream & out, const Vector & v);
 double operator%(const Vector & v1, const Vector & v2);
 Vector operator*(const Vector & v1, const Vector & v2);
+Vector operator+(const Vector & v1, const Vector & v2);
+Vector operator-(const Vector & v1, const Vector & v2);
 
 #endif