#define SHADOW_ALPHA_ID 1

   images {
      image: "shadow-ball.png" COMP;
      image: "shadow-cube.png" COMP;
   }

#define SHADOW_GROUP(_name) \
   group { \
      name: #_name; \
 \
      script { \
         public message(Msg_Type:type, id, ...) \
         { \
            if ((type == MSG_FLOAT) && (id == SHADOW_ALPHA_ID)) \
            { \
               new Float:shadow_alpha = getfarg(2); \
               set_tween_state(PART:"shadow", shadow_alpha, "default", 0.0, \
                     "visible", 0.0); \
            } \
         } \
      } \
 \
      parts { \
 \
         part { \
            name: "shadow"; \
            mouse_events: 0; \
            type: IMAGE; \
            description { \
               state: "default" 0.0; \
               image.normal: _name##".png"; \
               color: 255 255 255 0; \
            } \
            description { \
               state: "visible" 0.0; \
               inherit: "default" 0.0; \
               color: 255 255 255 255; \
            } \
         } \
      } \
 \
   }

SHADOW_GROUP(shadow-ball)
SHADOW_GROUP(shadow-cube)

#undef SHADOW_GROUP
#undef SHADOW_ALPHA_ID