added getInverse() to util/Transform, fixed transform_*() functions

git-svn-id: svn://anubis/fart/trunk@39 7f9b0f55-74a9-4bce-be96-3c2cd072584d

main/Scene.cc

@@ -117,8 +117,16 @@ void Scene::renderPixel(int x, int y, unsigned char * pixel)
 
     Ray ray(Vector(0, 0, 0), Vector(rx, ry, rz));
 
-    // TODO: um... real work
-    pixel[BMP_RED] = 0;
-    pixel[BMP_GREEN] = 0;
-    pixel[BMP_BLUE] = 0;
+    /* loop through all shapes in the scene */
+    for (vector<Shape *>::iterator it = m_shapes.begin();
+         it != m_shapes.end();
+         it++)
+    {
+        /* transform the ray by the inverse of the shape's transform */
+        Transform inv = (*it)->getTransform().getInverse();
+        Ray transformed_ray = inv.transform_ray(ray);
+
+        /* then intersect this inversely transformed ray with the shape */
+        Solver::Result intersections = (*it)->intersect(transformed_ray);
+    }
 }