diff -r 5d043eeb09d9 -r 7079dcc3bd74 ccdemos/spheres_shadow.cc
--- a/ccdemos/spheres_shadow.cc	Fri Dec 14 10:34:31 2007 +0100
+++ b/ccdemos/spheres_shadow.cc	Fri Dec 14 16:51:22 2007 +0100
@@ -1,15 +1,16 @@
 #include "raytracer.h"
-#include "kdtree.h"
+#include "octree.h"
+
 #include "image.h"
+#include "common_sdl.h"
 
-int main()
+int main(int argc, char **argv)
 {
 	Raytracer rt;
-	rt.setThreads(2);
 	rt.setOversample(0);
 	rt.setSubsample(8);
 
-	KdTree top;
+	Octree top;
 	rt.setTop(&top);
 
 	Light light1(Vector3(0.0, 5.0, -5.0), Colour(0.7, 0.3, 0.6));
@@ -41,22 +42,28 @@
 	cam.setEye(Vector3(0,0,15));
 	rt.setCamera(&cam);
 
-	int w = 800;
-	int h = 600;
-	Float *fdata = (Float *) malloc(w*h*3*sizeof(Float));
-	rt.render(w, h, fdata);
-
-	struct image *img;
-	new_image(&img, w, h, 3);
+	w = 800;
+	h = 600;
 
-	Float *fd = fdata;
-	for (char *cd = img->data; cd != img->data + w*h*3; cd++, fd++) {
-		if (*fd > 1.0)
-			*cd = 255;
-		else
-			*cd = (unsigned char)(*fd * 255.0);
+	if (argc == 2 && !strcmp(argv[1], "-i"))
+		loop_sdl(rt, cam);
+	else
+	{
+		Float *fdata = (Float *) malloc(w*h*3*sizeof(Float));
+		rt.render(w, h, fdata);
+	
+		struct image *img;
+		new_image(&img, w, h, 3);
+	
+		Float *fd = fdata;
+		for (char *cd = img->data; cd != img->data + w*h*3; cd++, fd++) {
+			if (*fd > 1.0)
+				*cd = 255;
+			else
+				*cd = (unsigned char)(*fd * 255.0);
+		}
+		free(fdata);
+		save_png("spheres_shadow.png", img);
+		destroy_image(&img);
 	}
-	free(fdata);
-	save_png("spheres_shadow.png", img);
-	destroy_image(&img);
 }