Fixed #2901 / Fixed #2903

core/src/mindustry/world/Block.java

@@ -193,6 +193,8 @@ public class Block extends UnlockableContent{
     public BuildPlaceability buildPlaceability = BuildPlaceability.always;
     /** Multiplier for speed of building this block. */
     public float buildCostMultiplier = 1f;
+    /** Multiplier for cost of research in tech tree. */
+    public float researchCostMultiplier = 1;
     /** Whether this block has instant transfer.*/
     public boolean instantTransfer = false;
     /** Whether you can rotate this block with Keybind rotateplaced + Scroll Wheel. */
@@ -619,7 +621,7 @@ public class Block extends UnlockableContent{
     public ItemStack[] researchRequirements(){
         ItemStack[] out = new ItemStack[requirements.length];
         for(int i = 0; i < out.length; i++){
-            int quantity = 40 + Mathf.round(Mathf.pow(requirements[i].amount, 1.25f) * 20, 10);
+            int quantity = 40 + Mathf.round(Mathf.pow(requirements[i].amount, 1.25f) * 20 * researchCostMultiplier, 10);
 
             out[i] = new ItemStack(requirements[i].item, UI.roundAmount(quantity));
         }

core/src/mindustry/world/blocks/storage/CoreBlock.java

@@ -14,6 +14,7 @@ import mindustry.game.EventType.*;
 import mindustry.game.*;
 import mindustry.gen.*;
 import mindustry.graphics.*;
+import mindustry.logic.*;
 import mindustry.type.*;
 import mindustry.ui.*;
 import mindustry.world.*;
@@ -159,6 +160,12 @@ public class CoreBlock extends StorageBlock{
         public BlockUnitc unit = Nulls.blockUnit;
         public boolean noEffect = false;
 
+        @Override
+        public double sense(LAccess sensor){
+            if(sensor == LAccess.itemCapacity) return storageCapacity;
+            return super.sense(sensor);
+        }
+
         @Override
         public void created(){
             unit = (BlockUnitc)UnitTypes.block.create(team);