improving Ray, Sphere, Solver, Scene a bit

git-svn-id: svn://anubis/fart/trunk@35 7f9b0f55-74a9-4bce-be96-3c2cd072584d

shapes/Sphere.cc

@@ -18,5 +18,15 @@ Solver::Result Sphere::intersect(const Ray & ray)
                            + ray.getOrigin()[1] * ray.getOrigin()[1]
                            + ray.getOrigin()[2] * ray.getOrigin()[2] );
     Solver::Result quadSolutions = solver.solve();
+    int resIdx = 0;
+    for (int i = 0; i < quadSolutions.numResults; i++)
+    {
+        if (quadSolutions.results[i] >= 0.0)
+        {
+            res.results[resIdx] = quadSolutions.results[i];
+            resIdx++;
+            res.numResults = resIdx;
+        }
+    }
     return res;
 }