added Ray::randomRay() to generated a ray with origin at (0,0,0) and a random direction

git-svn-id: svn://anubis/fart/trunk@254 7f9b0f55-74a9-4bce-be96-3c2cd072584d

main/fart.cc

@@ -1,15 +1,19 @@
 
-#include <iostream>
 #include <string.h>
 #include <unistd.h>                 /* sysconf() */
-#include <stdlib.h>
+#include <stdlib.h>                 /* rand(), srand() */
+#include <time.h>                   /* time() */
 #include <getopt.h>
 #include <sys/time.h>               /* gettimeofday() */
+
+#include <iostream>
 #include <string>
 #include <map>
+
 #include "Scene.h"
 #include "distrib/distrib.h"
 #include "BMP.h"
+
 using namespace std;
 
 void usage(const char * progname)
@@ -163,6 +167,8 @@ int main(int argc, char * argv[])
         usage(argv[0]);
     }
 
+    srand(time(NULL));
+
     const char * filename = argv[optind];
     client_options.push_back(filename);
     Scene scene(scene_options, filename);