fixed bug in shapes/Plane which would return negative results, fixed bug in main/Scene which would not check for shape to be non-null after calling getRayClosestHit()

git-svn-id: svn://anubis/fart/trunk@161 7f9b0f55-74a9-4bce-be96-3c2cd072584d

util/Solver.cc

@@ -16,6 +16,11 @@ Solver::~Solver()
 {
 }
 
+Solver::Result::Result()
+{
+    numResults = 0;
+}
+
 
 /**************************************************************************
  * LinearSolver methods                                                   *
@@ -120,7 +125,3 @@ Solver::Result QuarticSolver::solve()
     return res;
 }
 
-Solver::Result::Result()
-{
-    numResults = 0;
-}