diff -r fc18ac4833f2 -r a0a3e334744f ccdemos/spheres_shadow.cc
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ccdemos/spheres_shadow.cc	Sun Nov 25 17:58:29 2007 +0100
@@ -0,0 +1,47 @@
+#include "raytracer.h"
+#include "image.h"
+
+int main()
+{
+	Raytracer rt;
+	Light light1(Vector3(0.0, 5.0, 5.0), Colour(0.7, 0.3, 0.6));
+	rt.addlight(&light1);
+
+	Light light2(Vector3(-2.0, 10.0, 2.0), Colour(0.4, 0.6, 0.3));
+	rt.addlight(&light2);
+
+	Material mat0(Colour(0.7, 0.7, 0.7));
+
+	Box box(Vector3(-20.0, -1.2, -20.0), Vector3(20.0, -1.0, 20.0), &mat0);
+	rt.addshape(&box);
+
+	Material mat1(Colour(1.0, 0.0, 0.0));
+	Sphere bigsphere(Vector3(3.0, 2.0, 7.0), 3.0, &mat1);
+	rt.addshape(&bigsphere);
+
+	Material mat2(Colour(0.0, 1.0, 0.0));
+	Sphere smallsphere(Vector3(-5.5, 1.5, 8.0), 2.0, &mat2);
+	rt.addshape(&smallsphere);
+
+	Material mat3(Colour(0.0, 0.0, 1.0));
+	Sphere tinysphere(Vector3(-1.2, 0.0, 2.0), 0.5, &mat3);
+	rt.addshape(&tinysphere);
+
+	int w = 800;
+	int h = 600;
+	float *fdata = rt.render(w, h);
+
+	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);
+}