broke traceRay() out into getRayHits()

git-svn-id: svn://anubis/fart/trunk@51 7f9b0f55-74a9-4bce-be96-3c2cd072584d

shapes/Shape.h

@@ -10,6 +10,7 @@
 class Shape
 {
     public:
+        Shape();
         virtual Solver::Result intersect(const Ray & ray) = 0;
         virtual Vector getNormalAt(const Vector & pt) = 0;
 
@@ -19,10 +20,13 @@ class Shape
             m_inverse = t.getInverse();
         }
         Transform & getTransform() { return m_transform; }
+        void setTransparency(double t) { m_transparency = t; }
+        double getTransparency() const { return m_transparency; }
 
     protected:
         Transform m_transform;
         Transform m_inverse;
+        double m_transparency;
 };
 
 #endif