Remove redundant relic

manimlib/shaders/inserts/add_light.glsl

@@ -1,43 +0,0 @@
-///// INSERT COLOR_MAP FUNCTION HERE /////
-
-vec4 add_light(vec4 color,
-               vec3 point,
-               vec3 unit_normal,
-               vec3 light_coords,
-               float gloss,
-               float shadow){
-    ///// INSERT COLOR FUNCTION HERE /////
-    // The line above may be replaced by arbitrary code snippets, as per
-    // the method Mobject.set_color_by_code
-    if(gloss == 0.0 && shadow == 0.0) return color;
-
-    // TODO, do we actually want this?  It effectively treats surfaces as two-sided
-    if(unit_normal.z < 0){
-            unit_normal *= -1;
-    }
-
-    // TODO, read this in as a uniform?
-    float camera_distance = 6;  
-    // Assume everything has already been rotated such that camera is in the z-direction
-    vec3 to_camera = vec3(0, 0, camera_distance) - point;
-    vec3 to_light = light_coords - point;
-    vec3 light_reflection = -to_light + 2 * unit_normal * dot(to_light, unit_normal);
-    float dot_prod = dot(normalize(light_reflection), normalize(to_camera));
-    float shine = gloss * exp(-3 * pow(1 - dot_prod, 2));
-    float dp2 = dot(normalize(to_light), unit_normal);
-    float darkening = mix(1, max(dp2, 0), shadow);
-    return vec4(
-            darkening * mix(color.rgb, vec3(1.0), shine),
-            color.a
-    );
-}
-
-vec4 finalize_color(vec4 color,
-                    vec3 point,
-                    vec3 unit_normal,
-                    vec3 light_coords,
-                    float gloss,
-                    float shadow){
-    // Put insertion here instead
-    return add_light(color, point, unit_normal, light_coords, gloss, shadow);
-}