diff -r f22952603f29 -r 79b516a3803d ccdemos/realtime.cc
--- a/ccdemos/realtime.cc	Thu Nov 29 18:30:16 2007 +0100
+++ b/ccdemos/realtime.cc	Fri Nov 30 00:44:51 2007 +0100
@@ -2,8 +2,8 @@
 
 #include "raytracer.h"
 
-int w = 512;
-int h = 200;
+int w = 480;
+int h = 288;
 float *render_buffer;
 
 Raytracer rt;
@@ -13,11 +13,9 @@
 {
 	rt.render(w, h, render_buffer);
 
-	if ( SDL_MUSTLOCK(screen) ) {
-		if ( SDL_LockSurface(screen) < 0 ) {
+	if (SDL_MUSTLOCK(screen))
+		if (SDL_LockSurface(screen) < 0)
 			return;
-		}
-	}
 
 	Uint32 *bufp = (Uint32 *)screen->pixels;
 	unsigned char c[3];
@@ -34,12 +32,13 @@
 		bufp++;
 	}
 
-	if ( SDL_MUSTLOCK(screen) ) {
+	if (SDL_MUSTLOCK(screen))
 		SDL_UnlockSurface(screen);
-	}
 
-	SDL_UpdateRect(screen, 0, 0, w, h);
-	SDL_Flip(screen);
+	if (screen->flags & SDL_DOUBLEBUF)
+		SDL_Flip(screen);
+	else
+		SDL_UpdateRect(screen, 0, 0, w, h);
 }
 
 int main()
@@ -64,25 +63,29 @@
 	render_buffer = (float *) malloc(w*h*3*sizeof(float));
 
 	rt.setThreads(2);
+	rt.setMaxDepth(1);
 
 	KdTree top;
 	rt.setTop(&top);
 
 	Light light1(Vector3(2.0, -5.0, -5.0), Colour(0.7, 0.3, 0.6));
+	light1.castShadows(false);
 	rt.addlight(&light1);
 
 	Light light2(Vector3(-2.0, 10.0, 2.0), Colour(0.4, 0.6, 0.3));
+	light2.castShadows(false);
 	rt.addlight(&light2);
 
 	Material mat_sph(Colour(1.0, 1.0, 1.0));
-	for (int y=0; y<20; y++)
-		for (int x=0; x<20; x++)
-			rt.addshape(new Sphere(Vector3(x-10, (float)random()/RAND_MAX*5.0, y-10), 0.45, &mat_sph));
+	for (int y=0; y<10; y++)
+		for (int x=0; x<10; x++)
+			rt.addshape(new Sphere(Vector3(x*2-10, (float)random()/RAND_MAX*5.0, y*2-10), 0.45, &mat_sph));
 
 	rt.setCamera(&cam);
 	cam.setEye(Vector3(0,0,10));
 
 	/* build kd-tree */
+	top.setMaxDepth(100);
 	top.optimize();
 
 	/* loop... */