source/blender/draw/engines/eevee_next/shaders/eevee_surf_world_frag.glsl

@@ -21,7 +21,7 @@ void main()
 
   init_globals();
   /* View position is passed to keep accuracy. */
-  g_data.N = normal_view_to_world(drw_view_incident_vector(interp.P));
+  g_data.N = drw_normal_view_to_world(drw_view_incident_vector(interp.P));
   g_data.Ng = g_data.N;
   g_data.P = -g_data.N;
   attrib_load();

source/blender/draw/intern/shaders/draw_view_lib.glsl

@@ -57,7 +57,7 @@ vec3 drw_world_incident_vector(vec3 P)
  */
 vec3 drw_view_incident_vector(vec3 vP)
 {
-  return drw_view_is_perspective() ? normalize(vP) : vec3(0.0, 0.0, -1.0);
+  return drw_view_is_perspective() ? normalize(-vP) : vec3(0.0, 0.0, 1.0);
 }
 
 /**