Mostly finished T2 spider unit

core/src/mindustry/graphics/OverlayRenderer.java

@@ -57,6 +57,10 @@ public class OverlayRenderer{
             }
         }
 
+        if(pos.isEmpty()){
+            return;
+        }
+
         //if this is laggy, it could be shoved in another thread.
         var result = Voronoi.generate(pos.toArray(Vec2.class), 0, world.unitWidth(), 0, world.unitHeight());
         for(var edge : result){

core/src/mindustry/graphics/Pal.java

@@ -127,6 +127,7 @@ public class Pal{
 
     redLight = Color.valueOf("feb380"),
     slagOrange = Color.valueOf("ffa166"),
+    techBlue = Color.valueOf("8ca9e8"),
 
     vent = Color.valueOf("6b4e4e");
 }