1 files changed, 5 insertions, 5 deletions
diff --git a/data/shaders/light-refract.frag b/data/shaders/light-refract.frag
index 1dcd751..184ba29 100644
--- a/data/shaders/light-refract.frag
+++ b/data/shaders/light-refract.frag
@@ -12,12 +12,11 @@ void main()
     const vec4 matSpecular = vec4(1.0, 1.0, 1.0, 1.0);
     const float matShininess = 100.0;
     const vec2 point_five = vec2(0.5);
-    // Need the normalized light direction and surface normal vectors to
+    // Need the normalized eye direction and surface normal vectors to
     // compute the refraction vector through the "front" surface of the object.
-    vec3 light_direction = normalize(vertex_position.xyz/vertex_position.w -
-                                     LightSourcePosition.xyz/LightSourcePosition.w);
+    vec3 eye_direction = normalize(-vertex_position.xyz);
     vec3 normalized_normal = normalize(vertex_normal);
-    vec3 front_refraction = refract(light_direction, normalized_normal, 1.5);
+    vec3 front_refraction = refract(eye_direction, normalized_normal, 1.5);
     // Offset the base map coordinate by the refaction vector, and re-normalize
     // to texture coordinate space [0, 1].
     vec2 normcoord = (MapCoord.st + front_refraction.st + point_five) * point_five;
@@ -27,8 +26,9 @@ void main()
     vec2 imagecoord = (normcoord + back_refraction.st + point_five) * point_five;
     vec4 texel = texture2D(ImageMap, imagecoord);
     // Add in a specular component
+    vec3 light_direction = normalize(vertex_position.xyz/vertex_position.w -
+                                     LightSourcePosition.xyz/LightSourcePosition.w);
     vec3 reflection = reflect(light_direction, normalized_normal);
-    vec3 eye_direction = normalize(-vertex_position.xyz);
     float specularTerm = pow(max(0.0, dot(reflection, eye_direction)), matShininess);
     vec4 specular = (lightSpecular * matSpecular);
     gl_FragColor = (specular * specularTerm) + texel;