shader 
phong_shader(
	point v_position = vector(0,0,0),
	vector v_normal = vector(0,1,0),
	vector v_toCamera = vector(0,0,0),
	vector v_toLight = vector(0,0,0),
	output color resultRGB = 0
)
{
	vector vL = normalize(v_toLight);
	vector vV = normalize(v_toCamera);
	vector vN = normalize(v_normal);
	vector vR = 2 * dot(vL, vN)*vN - vL;
	vector vH = normalize(vL + vV);
	
	color u_ambientColor;
	getattribute("env:ambient_color", u_ambientColor);
	
	color u_matColor;
	getattribute("self:mat_color", u_matColor);
	
	color u_lightColor;
	getattribute("light0:color", u_lightColor);

	color colAmbient = u_ambientColor*u_matColor;

	float ndotl = max(dot(vN, vL), 0);
	color colDiff = ndotl * u_matColor * u_lightColor;

	float spec = max(dot(vN, vH), 0);
	color colSpec = step(0, ndotl) * pow(spec, 64) * u_matColor * u_lightColor;
	
	color final = colAmbient + colDiff + colSpec;

	//gamma
	resultRGB = pow(final, vector(1.0/2.2));
}