originaldoshade

	Vector3d theLight;		// the light direction, normalized
	COLOR_C id, is, lightxmat, finalIntensity;
	Vector3d specLight, viewVec;
	double diff, spec;
	double ks = 1.0;
	double kd = 1.0;
	double ka = 1.0;
	
	// ambient lighting
	lightxmat.set(mat.color * mat.ca); 
	finalIntensity.set((ka * lightxmat));
		
		
	for (int i=0; i < 2; i++) {
		if( lights[i].type == 0) {
			theLight = lights[i].info.normalize();
		} else if (lights[i].type == 1) {
			theLight = (hit.hitpoint - lights[i].info).normalize();
		}
			 
		// do diffuse lighting
		lightxmat.set((mat.color * mat.cd) * lights[i].color); 
		
		if ((diff = theLight * hit.normal) < 0.0) {
			id.set(-diff * lightxmat);
			finalIntensity.set(finalIntensity + (kd * id));
		}
		
		// do specular lighting	
		lightxmat.set(mat.cs * lights[i].color); 
		specLight = theLight - 2 * (theLight * hit.normal) * hit.normal;
		viewVec = (camera.vPoint - hit.hitpoint).normalize();
		
		if ((spec = specLight * viewVec) > 0.0) {
			is.set((pow(spec, mat.n)) * lightxmat);
			finalIntensity.set(finalIntensity + (ks * is));
		} 
	}
	return finalIntensity;
}