Implementation of #7325

core/assets/bundles/bundle.properties

@@ -1605,6 +1605,7 @@ block.electric-heater.name = Electric Heater
 block.slag-heater.name = Slag Heater
 block.phase-heater.name = Phase Heater
 block.heat-redirector.name = Heat Redirector
+block.heat-router.name = Heat Router
 block.slag-incinerator.name = Slag Incinerator
 block.carbide-crucible.name = Carbide Crucible
 block.slag-centrifuge.name = Slag Centrifuge
@@ -1964,6 +1965,7 @@ block.electric-heater.description = Applies heat to structures. Requires large a
 block.slag-heater.description = Applies heat to structures. Requires slag.
 block.phase-heater.description = Applies heat to structures. Requires phase fabric.
 block.heat-redirector.description = Redirects accumulated heat to other blocks.
+block.heat-router.description = Spreads accumulated heat in three output directions.
 block.electrolyzer.description = Converts water into hydrogen and ozone gas. Outputs resulting gases in two opposite directions, marked by corresponding colors.
 block.atmospheric-concentrator.description = Concentrates nitrogen from the atmosphere. Requires heat.
 block.surge-crucible.description = Forms surge alloy from slag and silicon. Requires heat.

core/assets/icons/icons.properties

@@ -580,3 +580,4 @@
 63103=neoplasia-reactor|block-neoplasia-reactor-ui
 63102=sand-floor|block-sand-floor-ui
 63101=crystalline-vent|block-crystalline-vent-ui
+63100=heat-router|block-heat-router-ui

core/src/mindustry/ai/RtsAI.java

@@ -153,6 +153,7 @@ public class RtsAI{
         }
 
         Building defend = null;
+        boolean defendingCore = false;
 
         //there is something to defend, see if it's worth the time
         if(damaged.size > 0){
@@ -182,6 +183,10 @@ public class RtsAI{
                 if(debug){
                     Vars.ui.showLabel("Defend, dst = " + (int)(best.dst(ax, ay)), 8f, best.x, best.y);
                 }
+
+                if(best instanceof CoreBuild){
+                    defendingCore = true;
+                }
             }
         }
 
@@ -241,10 +246,12 @@ public class RtsAI{
                     }
 
                     //assign a flag, so it will be "mobilized" more easily later
+                    if(!defendingCore){
                         unit.flag = 1;
                     }
                 }
             }
+        }
 
         return anyDefend;
     }

core/src/mindustry/content/Blocks.java

@@ -73,7 +73,7 @@ public class Blocks{
     melter, separator, disassembler, sporePress, pulverizer, incinerator, coalCentrifuge,
 
     //crafting - erekir
-    siliconArcFurnace, electrolyzer, oxidationChamber, atmosphericConcentrator, electricHeater, slagHeater, phaseHeater, heatRedirector, slagIncinerator,
+    siliconArcFurnace, electrolyzer, oxidationChamber, atmosphericConcentrator, electricHeater, slagHeater, phaseHeater, heatRedirector, heatRouter, slagIncinerator,
     carbideCrucible, slagCentrifuge, surgeCrucible, cyanogenSynthesizer, phaseSynthesizer, heatReactor,
 
     //sandbox
@@ -1316,6 +1316,17 @@ public class Blocks{
             regionRotated1 = 1;
         }};
 
+        heatRouter = new HeatConductor("heat-router"){{
+            requirements(Category.crafting, with(Items.tungsten, 10, Items.graphite, 10));
+
+            researchCostMultiplier = 10f;
+
+            size = 3;
+            drawer = new DrawMulti(new DrawDefault(), new DrawHeatOutput(-1, false), new DrawHeatOutput(), new DrawHeatOutput(1, false), new DrawHeatInput("-heat"));
+            regionRotated1 = 1;
+            splitHeat = true;
+        }};
+
         slagIncinerator = new ItemIncinerator("slag-incinerator"){{
             requirements(Category.crafting, with(Items.tungsten, 15));
             size = 1;

core/src/mindustry/content/ErekirTechTree.java

@@ -220,6 +220,10 @@ public class ErekirTechTree{
                                                 });
                                             });
                                         });
+
+                                        node(heatRouter, () -> {
+
+                                        });
                                     });
                                 });
                             });

core/src/mindustry/entities/comp/BuildingComp.java

@@ -351,7 +351,6 @@ abstract class BuildingComp implements Posc, Teamc, Healthc, Buildingc, Timerc,
         return calculateHeat(sideHeat, null);
     }
 
-    //TODO can cameFrom be an IntSet?
     public float calculateHeat(float[] sideHeat, @Nullable IntSet cameFrom){
         Arrays.fill(sideHeat, 0f);
         if(cameFrom != null) cameFrom.clear();
@@ -360,12 +359,20 @@ abstract class BuildingComp implements Posc, Teamc, Healthc, Buildingc, Timerc,
 
         for(var edge : block.getEdges()){
             Building build = nearby(edge.x, edge.y);
-            if(build != null && build.team == team && build instanceof HeatBlock heater && (!build.block.rotate || (relativeTo(build) + 2) % 4 == build.rotation)){ //TODO hacky
+            if(build != null && build.team == team && build instanceof HeatBlock heater){
+
+                boolean split = build.block instanceof HeatConductor cond && cond.splitHeat;
+                // non-routers must face us, routers must face away - next to a redirector, they're forced to face away due to cycles anyway
+                if(!build.block.rotate || (!split && (relativeTo(build) + 2) % 4 == build.rotation) || (split && relativeTo(build) != build.rotation)){ //TODO hacky
 
                     //if there's a cycle, ignore its heat
                     if(!(build instanceof HeatConductorBuild hc && hc.cameFrom.contains(id()))){
                         //heat is distributed across building size
                         float add = heater.heat() / build.block.size;
+                        if(split){
+                            //heat routers split heat across 3 surfaces
+                            add /= 3f;
+                        }
 
                         sideHeat[Mathf.mod(relativeTo(build), 4)] += add;
                         heat += add;
@@ -380,6 +387,7 @@ abstract class BuildingComp implements Posc, Teamc, Healthc, Buildingc, Timerc,
                     }
                 }
             }
+        }
         return heat;
     }
 

core/src/mindustry/world/blocks/heat/HeatConductor.java

@@ -14,6 +14,7 @@ import mindustry.world.draw.*;
 public class HeatConductor extends Block{
     public float visualMaxHeat = 15f;
     public DrawBlock drawer = new DrawDefault();
+    public boolean splitHeat = false;
 
     public HeatConductor(String name){
         super(name);
@@ -90,7 +91,7 @@ public class HeatConductor extends Block{
 
         @Override
         public float heatFrac(){
-            return heat / visualMaxHeat;
+            return (heat / visualMaxHeat) / (splitHeat ? 3f : 1);
         }
     }
 }

core/src/mindustry/world/draw/DrawHeatOutput.java

@@ -17,17 +17,28 @@ public class DrawHeatOutput extends DrawBlock{
     public Color heatColor = new Color(1f, 0.22f, 0.22f, 0.8f);
     public float heatPulse = 0.3f, heatPulseScl = 10f, glowMult = 1.2f;
 
+    public int rotOffset = 0;
+    public boolean drawGlow = true;
+
+    public DrawHeatOutput(){}
+
+    public DrawHeatOutput(int rotOffset, boolean drawGlow){
+        this.rotOffset = rotOffset;
+        this.drawGlow = drawGlow;
+    }
+
     @Override
     public void draw(Building build){
-        Draw.rect(build.rotation > 1 ? top2 : top1, build.x, build.y, build.rotdeg());
+        float rotdeg = (build.rotation + rotOffset) * 90;
+        Draw.rect(Mathf.mod((build.rotation + rotOffset), 4) > 1 ? top2 : top1, build.x, build.y, rotdeg);
 
         if(build instanceof HeatBlock heater && heater.heat() > 0){
             Draw.z(Layer.blockAdditive);
             Draw.blend(Blending.additive);
             Draw.color(heatColor, heater.heatFrac() * (heatColor.a * (1f - heatPulse + Mathf.absin(heatPulseScl, heatPulse))));
-            if(heat.found()) Draw.rect(heat, build.x, build.y, build.rotdeg());
+            if(heat.found()) Draw.rect(heat, build.x, build.y, rotdeg);
             Draw.color(Draw.getColor().mul(glowMult));
-            if(glow.found()) Draw.rect(glow, build.x, build.y);
+            if(drawGlow && glow.found()) Draw.rect(glow, build.x, build.y);
             Draw.blend();
             Draw.color();
         }
@@ -35,7 +46,7 @@ public class DrawHeatOutput extends DrawBlock{
 
     @Override
     public void drawPlan(Block block, BuildPlan plan, Eachable<BuildPlan> list){
-        Draw.rect(plan.rotation > 1 ? top2 : top1, plan.drawx(), plan.drawy(), plan.rotation * 90);
+        Draw.rect(Mathf.mod((plan.rotation + rotOffset), 4) > 1 ? top2 : top1, plan.drawx(), plan.drawy(), (plan.rotation + rotOffset) * 90);
     }
 
     @Override