Fixed #2929

core/src/mindustry/game/Team.java

@@ -83,9 +83,9 @@ public class Team implements Comparable<Team>{
         return state.rules.teams.get(this);
     }
 
-    public Team[] enemies(){
-        return state.teams.enemiesOf(this);
-    }
+    //public Team[] enemies(){
+    //    return state.teams.enemiesOf(this);
+    //}
 
     public TeamData data(){
         return state.teams.get(this);

core/src/mindustry/game/Teams.java

@@ -23,7 +23,9 @@ public class Teams{
     /** Maps team IDs to team data. */
     private TeamData[] map = new TeamData[256];
     /** Active teams. */
-    private Seq<TeamData> active = new Seq<>();
+    public Seq<TeamData> active = new Seq<>();
+    /** Teams with block or unit presence. */
+    public Seq<TeamData> present = new Seq<>(TeamData.class);
 
     public Teams(){
         active.add(get(Team.crux));
@@ -31,7 +33,7 @@ public class Teams{
 
     @Nullable
     public CoreBuild closestEnemyCore(float x, float y, Team team){
-        for(Team enemy : team.enemies()){
+        for(Team enemy : team.data().coreEnemies){
             CoreBuild tile = Geometry.findClosest(x, y, enemy.cores());
             if(tile != null) return tile;
         }
@@ -43,9 +45,9 @@ public class Teams{
         return Geometry.findClosest(x, y, get(team).cores);
     }
 
-    public Team[] enemiesOf(Team team){
-        return get(team).enemies;
-    }
+    //public Team[] enemiesOf(Team team){
+    //    return get(team).enemies;
+    //}
 
     public boolean eachEnemyCore(Team team, Boolf<CoreBuild> ret){
         for(TeamData data : active){
@@ -145,9 +147,12 @@ public class Teams{
     }
 
     public void updateTeamStats(){
+        present.clear();
+
         for(Team team : Team.all){
             TeamData data = team.data();
 
+            data.presentFlag = false;
             data.unitCount = 0;
             data.units.clear();
             if(data.tree != null){
@@ -168,10 +173,14 @@ public class Teams{
             }
         }
 
+        //update presence flag.
+        Groups.build.each( b -> b.team.data().presentFlag = true);
+
         for(Unit unit : Groups.unit){
             TeamData data = unit.team.data();
             data.tree().insert(unit);
             data.units.add(unit);
+            data.presentFlag = true;
 
             if(data.unitsByType == null || data.unitsByType.length <= unit.type().id){
                 data.unitsByType = new Seq[content.units().size];
@@ -185,6 +194,15 @@ public class Teams{
 
             count(unit);
         }
+
+        //update presence of each team.
+        for(Team team : Team.all){
+            TeamData data = team.data();
+
+            if(data.presentFlag || data.active()){
+                present.add(data);
+            }
+        }
     }
 
     private void updateEnemies(){
@@ -201,7 +219,7 @@ public class Teams{
                 }
             }
 
-            data.enemies = enemies.toArray(Team.class);
+            data.coreEnemies = enemies.toArray(Team.class);
         }
     }
 
@@ -210,7 +228,10 @@ public class Teams{
         public final Team team;
         public final BaseAI ai;
 
-        public Team[] enemies = {};
+        private boolean presentFlag;
+
+        /** Enemies with cores or spawn points. */
+        public Team[] coreEnemies = {};
         /** Planned blocks for drones. This is usually only blocks that have been broken. */
         public Queue<BlockPlan> blocks = new Queue<>();
         /** The current command for units to follow. */