;  function​ lighting(material, light, point, eyev, normalv)
; 	   ​# combine the surface color with the light's color/intensity​
; 	  effective_color ← material.color * light.intensity
	
; 	  ​# find the direction to the light source​
; 	  lightv ← normalize(light.position - point)
	
; 	  ​# compute the ambient contribution​
; 	  ambient ← effective_color * material.ambient
	
; 	  ​# light_dot_normal represents the cosine of the angle between the​
; 	  ​# light vector and the normal vector. A negative number means the​
; 	  ​# light is on the other side of the surface.​
; 	  light_dot_normal ← dot(lightv, normalv)
; 	  ​if​ light_dot_normal < 0
; 	    diffuse ← black
; 	    specular ← black
	
; 	  ​else​
; 	    ​# compute the diffuse contribution​
; 	    diffuse ← effective_color * material.diffuse * light_dot_normal
	
; 	    ​# reflect_dot_eye represents the cosine of the angle between the​
; 	    ​# reflection vector and the eye vector. A negative number means the​
; 	    ​# light reflects away from the eye.​
; 	    reflectv ← reflect(-lightv, normalv)
; 	    reflect_dot_eye ← dot(reflectv, eyev)
	
; 	    ​if​ reflect_dot_eye <= 0
; 	      specular ← black
; 	    ​else​
; 	      ​# compute the specular contribution​
; 	      factor ← pow(reflect_dot_eye, material.shininess)
; 	      specular ← light.intensity * material.specular * factor
; 	    ​end​ ​if​
; 	  ​end​ ​if​
	
; 	  ​# Add the three contributions together to get the final shading​
; 	  ​return​ ambient + diffuse + specular
; 	​end​ ​function