fix possible division by zero in ccdemos/common_ply.h
don't use DEFS variable in makefiles, just add it to CCFLAGS
compile float version of libs with -fsingle-precision-constant
#include <stdlib.h>
#include "raytracer.h"
#include "octree.h"
#include "common_sdl.h"
int main(int argc, char **argv)
{
	Raytracer rt;
	Octree top;
	Camera cam;
	rt.setMaxDepth(3);
	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<10; y++)
		for (int x=0; x<10; x++)
			rt.addshape(new Sphere(Vector3(x*2-10, (Float)rand()/RAND_MAX*5.0, y*2-10), 0.45, &mat_sph));
	rt.setCamera(&cam);
	cam.setEye(Vector3(0,0,10));
	top.optimize();
	loop_sdl(rt, cam);
}