refraction shading

shader.fs

@@ -10,10 +10,31 @@ uniform samplerCube skybox;
 in vec2 TexCoords;
 uniform sampler2D texture_diffuse1;
 
+const float air_ri = 1.00;
+const float water_ri = 1.33;
+const float Ice_ri = 1.309;
+const float glass_ri = 1.52;
+const float diamond_ri = 2.42;
+
 void main()
 {
+    // Regular shading
+    // texture( texture_diffuse1, TexCoords) ;
+
+
+    // Reflective shading
+    /*
     vec3 I = normalize(Position - cameraPos);
     vec3 R = reflect(I, normalize(Normal));
 
-    FragColor =  vec4(texture(skybox,R).rgb, 1.0); // texture( texture_diffuse1, TexCoords) ;
+    FragColor =  vec4(texture(skybox,R).rgb, 1.0);
+    */
+
+
+    // Refractive shading
+    float ratio = air_ri/water_ri;
+    vec3 I = normalize(Position-cameraPos);
+    vec3 R = refract(I, normalize(Normal), ratio);
+    FragColor = vec4(texture(skybox, R).rgb, 1.0);
+
 }