Env rules for many various blocks

core/src/mindustry/maps/planet/AsteroidGenerator.java

@@ -0,0 +1,37 @@
+package mindustry.maps.planet;
+
+import arc.math.*;
+import arc.util.noise.*;
+import mindustry.content.*;
+import mindustry.game.*;
+import mindustry.maps.generators.*;
+import mindustry.type.*;
+import mindustry.world.meta.*;
+
+import static mindustry.Vars.*;
+
+public class AsteroidGenerator extends BlankPlanetGenerator{
+
+    @Override
+    public void generate(){
+        int seed = state.rules.sector.planet.id;
+        int sx = width/2, sy = height/2;
+
+        pass((x, y) -> {
+            floor = Blocks.space;
+
+            if(Simplex.noise2d(seed, 5, 0.6f, 1f/ 100f, x, y) + Mathf.dst(x, y, sx, sy) / (float)width / 2f > 0.7f){
+                floor = Blocks.stone;
+            }
+        });
+
+        Schematics.placeLaunchLoadout(sx, sy);
+
+        state.rules.environment = Env.space;
+    }
+
+    @Override
+    public int getSectorSize(Sector sector){
+        return 450;
+    }
+}