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

main/Scene.cc

@@ -151,26 +151,11 @@ Vector Scene::traceRay(const Ray & ray)
          it != m_shapes.end();
          it++)
     {
-        /* transform the ray by the inverse of the shape's transform */
-        Transform inv = (*it)->getTransform().getInverse();
-        Ray local_ray = inv.transform_ray(ray);
-
         /* then intersect this inversely transformed ray with the shape */
-        Solver::Result intersections = (*it)->intersect(local_ray);
+        Solver::Result intersections = (*it)->intersect(ray);
 
         if (intersections.numResults > 0)
         {
-            Vector local_normal =
-                (*it)->getNormalAt(local_ray[intersections.results[0]]);
-            double dot = local_ray.getDirection() % local_normal;
-            dot = -dot;
-            if (dot < 0.0)
-                dot = 0.0;
-#if 0
-            color[0] = dot;
-            color[1] = dot;
-            color[2] = dot;
-#endif
             color[0] = color[1] = color[2] = 1.0;
         }
         else