added jitter and radius parameters to light objects; not using them yet

git-svn-id: svn://anubis/fart/trunk@255 7f9b0f55-74a9-4bce-be96-3c2cd072584d

util/Ray.cc

@@ -18,14 +18,7 @@ Ray::Ray(const Vector & origin, const Vector & direction)
 
 Ray Ray::randomRay()
 {
-    double x, y, z;
-    do
-    {
-        x = 2.0 * rand() / RAND_MAX - 1.0;
-        y = 2.0 * rand() / RAND_MAX - 1.0;
-        z = 2.0 * rand() / RAND_MAX - 1.0;
-    } while (x*x + y*y + z*z <= 1.0);
-    return Ray(Vector(0, 0, 0), Vector(x, y, z));
+    return Ray(Vector(0, 0, 0), Vector::randomVector());
 }
 
 /*

util/Vector.cc

@@ -1,7 +1,10 @@
 
+#include <stdlib.h>                 /* rand() */
+#include <math.h>
+
+#include <iostream>
+
 #include "Vector.h"
-#include <iostream>
-#include <math.h>
 
 Vector::Vector()
 {
@@ -17,6 +20,18 @@ Vector::Vector(double x, double y, double z)
     m_array[2] = z;
 }
 
+Vector Vector::randomVector()
+{
+    double x, y, z;
+    do
+    {
+        x = 2.0 * rand() / RAND_MAX - 1.0;
+        y = 2.0 * rand() / RAND_MAX - 1.0;
+        z = 2.0 * rand() / RAND_MAX - 1.0;
+    } while (x*x + y*y + z*z > 1.0);
+    return Vector(x, y, z).normalize();
+}
+
 Vector & Vector::normalize()
 {
     double length = mag();

util/Vector.h

@@ -9,6 +9,7 @@ class Vector
     public:
         Vector();
         Vector(double x, double y, double z);
+        static Vector randomVector();
         double & operator[](int idx) { return m_array[idx]; }
         double operator[](int idx) const { return m_array[idx]; }
         Vector operator-() const;