Implemented Anuken/Mindustry-Suggestions/issues/3026

core/src/mindustry/entities/bullet/BulletType.java

@@ -91,6 +91,8 @@ public class BulletType extends Content implements Cloneable{
     public boolean collidesAir = true, collidesGround = true;
     /** Whether this bullet types collides with anything at all. */
     public boolean collides = true;
+    /** If true, this projectile collides with non-surface floors. */
+    public boolean collideFloor = false;
     /** Whether velocity is inherited from the shooter. */
     public boolean keepVelocity = true;
     /** Whether to scale lifetime (not actually velocity!) to disappear at the target position. Used for artillery. */

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

@@ -6,12 +6,14 @@ import arc.math.geom.*;
 import arc.struct.*;
 import arc.util.*;
 import mindustry.annotations.Annotations.*;
+import mindustry.content.*;
 import mindustry.core.*;
 import mindustry.entities.bullet.*;
 import mindustry.game.*;
 import mindustry.game.Teams.*;
 import mindustry.gen.*;
 import mindustry.graphics.*;
+import mindustry.world.*;
 
 import static mindustry.Vars.*;
 
@@ -137,6 +139,17 @@ abstract class BulletComp implements Timedc, Damagec, Hitboxc, Teamc, Posc, Draw
 
         while(x >= 0 && y >= 0 && x < ww && y < wh){
             Building build = world.build(x, y);
+
+            if(type.collideFloor){
+                Tile tile = world.tile(x, y);
+                if(tile == null || tile.floor().hasSurface() || tile.block() != Blocks.air){
+                    type.despawned(self());
+                    remove();
+                    hit = true;
+                    return;
+                }
+            }
+
             if(build != null && isAdded() && build.collide(self()) && type.testCollision(self(), build)
                 && !build.dead() && (type.collidesTeam || build.team != team) && !(type.pierceBuilding && hasCollided(build.id))){