Questions on first half of course
	Alg for raytracing
	set pixel in raytracing
	
	for each pixel
		create a ray
		for each object
			if the ray intersects the object and it is the closest intersection
				then set the pixel to color(object, point)
	
	color(object, point)
		normal at that point
		for each light
			make a shadow ray (from point to light)
			for each object (except this one)
				if shadow ray hits object
					skip this light
			vector to light (dot) normal = brightness if positive
		multiply total brightness by the object color
		
	
	
	timing - raytrace vs scanline
		scanline = O(triangles) + O(fragments * visual interest) ~= O(tri) + O(screen size * visual interest)
		
		raytracing = O(screen size * objects * visual interest)
		
		Spatial Bounding Hierarchy + raytracing = O(screen size * log(objects) * visual interest)