Fixed excessive memory usage of Spatial Index

build.gradle

@@ -86,8 +86,8 @@ dependencies {
 
     implementation group: 'org.luaj', name: 'luaj-jse', version: '3.0.1'
 
-    implementation group:  'ch.ethz.globis.phtree', name : 'phtree', version: '2.5.0'
     implementation group:  'com.esotericsoftware', name : 'reflectasm', version: '1.11.9'
+    implementation group:  'com.github.davidmoten', name : 'rtree-multi', version: '0.1'
 
     protobuf files('proto/')
 

src/main/java/emu/grasscutter/data/ResourceLoader.java

@@ -8,10 +8,9 @@ import java.util.Map.Entry;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
-import ch.ethz.globis.phtree.PhTree;
-import ch.ethz.globis.phtree.v16.PhTree16;
 import com.google.gson.Gson;
 import emu.grasscutter.data.custom.*;
+import emu.grasscutter.scripts.SceneIndexManager;
 import emu.grasscutter.utils.Utils;
 import lombok.SneakyThrows;
 import org.reflections.Reflections;
@@ -428,15 +427,12 @@ public class ResourceLoader {
 				continue;
 			}
 
-			PhTree<SceneNpcBornEntry> index = new PhTree16<>(3);
-
 			var data = Grasscutter.getGsonFactory().fromJson(Files.readString(file), SceneNpcBornData.class);
 			if(data.getBornPosList() == null || data.getBornPosList().size() == 0){
 				continue;
 			}
-			data.getBornPosList().forEach(item -> index.put(item.getPos().toLongArray(), item));
 
-			data.setIndex(index);
+			data.setIndex(SceneIndexManager.buildIndex(3, data.getBornPosList(), item -> item.getPos().toPoint()));
 			GameData.getSceneNpcBornData().put(data.getSceneId(), data);
 		}
 

src/main/java/emu/grasscutter/data/custom/SceneNpcBornData.java

@@ -1,6 +1,7 @@
 package emu.grasscutter.data.custom;
 
-import ch.ethz.globis.phtree.PhTree;
+import com.github.davidmoten.rtreemulti.RTree;
+import com.github.davidmoten.rtreemulti.geometry.Geometry;
 import emu.grasscutter.scripts.data.SceneGroup;
 import lombok.AccessLevel;
 import lombok.Data;
@@ -19,7 +20,7 @@ public class SceneNpcBornData {
     /**
      * Spatial Index For NPC
      */
-    transient PhTree<SceneNpcBornEntry> index;
+    transient RTree<SceneNpcBornEntry, Geometry> index;
 
     /**
      * npc groups

src/main/java/emu/grasscutter/game/world/Scene.java

@@ -498,11 +498,11 @@ public class Scene {
 			this.broadcastPacket(new PacketSceneEntityDisappearNotify(toRemove, VisionType.VISION_REMOVE));
 		}
 	}
-	public Set<SceneBlock> getPlayerActiveBlocks(Player player){
+
-		// TODO consider the borders of blocks
+	public List<SceneBlock> getPlayerActiveBlocks(Player player){
-		return getScriptManager().getBlocks().values().stream()
+		// consider the borders' entities of blocks, so we check if contains by index
-				.filter(block -> block.contains(player.getPos()))
+		return SceneIndexManager.queryNeighbors(getScriptManager().getBlocksIndex(),
-				.collect(Collectors.toSet());
+				player.getPos().toXZDoubleArray(), Grasscutter.getConfig().server.game.loadEntitiesForPlayerRange);
 	}
 	public void checkBlocks() {
 		Set<SceneBlock> visible = new HashSet<>();
@@ -542,9 +542,8 @@ public class Scene {
 
 	}
 	public List<SceneGroup> playerMeetGroups(Player player, SceneBlock block){
-		int RANGE = 100;
+		List<SceneGroup> sceneGroups = SceneIndexManager.queryNeighbors(block.sceneGroupIndex, player.getPos().toDoubleArray(),
-
+				Grasscutter.getConfig().server.game.loadEntitiesForPlayerRange);
-		List<SceneGroup> sceneGroups = SceneIndexManager.queryNeighbors(block.sceneGroupIndex, player.getPos(), RANGE);
 
 		List<SceneGroup> groups = sceneGroups.stream()
 				.filter(group -> !scriptManager.getLoadedGroupSetPerBlock().get(block.id).contains(group))
@@ -732,14 +731,14 @@ public class Scene {
 			return List.of();
 		}
 
-		int RANGE = 100;
 		var pos = player.getPos();
 		var data = GameData.getSceneNpcBornData().get(getId());
 		if(data == null){
 			return List.of();
 		}
 
-		var npcs = SceneIndexManager.queryNeighbors(data.getIndex(), pos.toLongArray(), RANGE);
+		var npcs = SceneIndexManager.queryNeighbors(data.getIndex(), pos.toDoubleArray(),
+				Grasscutter.getConfig().server.game.loadEntitiesForPlayerRange);
 		var entityNPCS = npcs.stream().map(item -> {
 					var group = data.getGroups().get(item.getGroupId());
 					if(group == null){

src/main/java/emu/grasscutter/scripts/SceneIndexManager.java

@@ -1,7 +1,9 @@
 package emu.grasscutter.scripts;
 
-import ch.ethz.globis.phtree.PhTree;
+import com.github.davidmoten.rtreemulti.Entry;
-import emu.grasscutter.utils.Position;
+import com.github.davidmoten.rtreemulti.RTree;
+import com.github.davidmoten.rtreemulti.geometry.Geometry;
+import com.github.davidmoten.rtreemulti.geometry.Rectangle;
 
 import java.util.ArrayList;
 import java.util.Collection;
@@ -10,31 +12,20 @@ import java.util.function.Function;
 
 public class SceneIndexManager {
 
-    public static <T> void buildIndex(PhTree<T> tree, Collection<T> elements, Function<T, long[]> extractor){
+    public static <T> RTree<T, Geometry> buildIndex(int dimensions, Collection<T> elements, Function<T, Geometry> extractor){
-        elements.forEach(e -> tree.put(extractor.apply(e), e));
+        RTree<T, Geometry> rtree = RTree.dimensions(dimensions).create();
+        return rtree.add(elements.stream().map(e -> Entry.entry(e, extractor.apply(e))).toList());
     }
-    public static <T> List<T> queryNeighbors(PhTree<T> tree, Position position, int range){
+    public static <T> List<T> queryNeighbors(RTree<T, Geometry> tree, double[] position, int range){
         var result = new ArrayList<T>();
-        var arrPos = position.toLongArray();
+        Rectangle rectangle = Rectangle.create(calRange(position, -range), calRange(position, range));
-        var query = tree.query(calRange(arrPos, -range), calRange(arrPos, range));
+        var queryResult = tree.search(rectangle);
-        while(query.hasNext()){
+        queryResult.forEach(q -> result.add(q.value()));
-            var element = query.next();
-            result.add(element);
-        }
         return result;
     }
-    public static <T> List<T> queryNeighbors(PhTree<T> tree, long[] position, int range){
+    private static double[] calRange(double[] position, int range){
-        var result = new ArrayList<T>();
-        var query = tree.query(calRange(position, -range), calRange(position, range));
-        while(query.hasNext()){
-            var element = query.next();
-            result.add(element);
-        }
-        return result;
-    }
-    private static long[] calRange(long[] position, int range){
         var newPos = position.clone();
-        for(int i=0;i<position.length;i++){
+        for(int i=0;i<newPos.length;i++){
             newPos[i] += range;
         }
         return newPos;

src/main/java/emu/grasscutter/scripts/SceneScriptManager.java

@@ -1,6 +1,7 @@
 package emu.grasscutter.scripts;
 
-import ch.ethz.globis.phtree.PhTree;
+import com.github.davidmoten.rtreemulti.RTree;
+import com.github.davidmoten.rtreemulti.geometry.Geometry;
 import emu.grasscutter.Grasscutter;
 import emu.grasscutter.data.GameData;
 import emu.grasscutter.data.def.MonsterData;
@@ -420,7 +421,7 @@ public class SceneScriptManager {
 		getScene().addEntities(gameEntity);
 	}
 
-	public PhTree<SceneBlock> getBlocksIndex() {
+	public RTree<SceneBlock, Geometry> getBlocksIndex() {
 		return meta.sceneBlockIndex;
 	}
 	public void removeMonstersInGroup(SceneGroup group, SceneSuite suite) {

src/main/java/emu/grasscutter/scripts/data/SceneBlock.java

@@ -1,7 +1,8 @@
 package emu.grasscutter.scripts.data;
 
-import ch.ethz.globis.phtree.PhTree;
+import com.github.davidmoten.rtreemulti.RTree;
-import ch.ethz.globis.phtree.v16.PhTree16;
+import com.github.davidmoten.rtreemulti.geometry.Geometry;
+import com.github.davidmoten.rtreemulti.geometry.Rectangle;
 import emu.grasscutter.Grasscutter;
 import emu.grasscutter.scripts.SceneIndexManager;
 import emu.grasscutter.scripts.ScriptLoader;
@@ -12,7 +13,6 @@ import lombok.ToString;
 import javax.script.Bindings;
 import javax.script.CompiledScript;
 import javax.script.ScriptException;
-import java.util.List;
 import java.util.Map;
 import java.util.stream.Collectors;
 
@@ -27,7 +27,7 @@ public class SceneBlock {
 
 	public int sceneId;
 	public Map<Integer,SceneGroup> groups;
-	public PhTree<SceneGroup> sceneGroupIndex = new PhTree16<>(3);
+	public RTree<SceneGroup, Geometry> sceneGroupIndex;
 
 	private transient boolean loaded; // Not an actual variable in the scripts either
 
@@ -67,11 +67,15 @@ public class SceneBlock {
 					.collect(Collectors.toMap(x -> x.id, y -> y));
 
 			groups.values().forEach(g -> g.block_id = id);
-			SceneIndexManager.buildIndex(this.sceneGroupIndex, groups.values(), g -> g.pos.toLongArray());
+			this.sceneGroupIndex = SceneIndexManager.buildIndex(3, groups.values(), g -> g.pos.toPoint());
 		} catch (ScriptException e) {
 			Grasscutter.getLogger().error("Error loading block " + id + " in scene " + sceneId, e);
 		}
 		Grasscutter.getLogger().info("scene {} block {} is loaded successfully.", sceneId, id);
 		return this;
 	}
+
+	public Rectangle toRectangle() {
+		return Rectangle.create(min.toXZDoubleArray(), max.toXZDoubleArray());
+	}
 }

src/main/java/emu/grasscutter/scripts/data/SceneMeta.java

@@ -1,11 +1,10 @@
 package emu.grasscutter.scripts.data;
 
-import ch.ethz.globis.phtree.PhTree;
+import com.github.davidmoten.rtreemulti.RTree;
-import ch.ethz.globis.phtree.v16.PhTree16;
+import com.github.davidmoten.rtreemulti.geometry.Geometry;
 import emu.grasscutter.Grasscutter;
 import emu.grasscutter.scripts.SceneIndexManager;
 import emu.grasscutter.scripts.ScriptLoader;
-import lombok.Data;
 import lombok.Setter;
 import lombok.ToString;
 
@@ -27,7 +26,7 @@ public class SceneMeta {
 
     public Bindings context;
 
-    public PhTree<SceneBlock> sceneBlockIndex = new PhTree16<>(2);
+    public RTree<SceneBlock, Geometry> sceneBlockIndex;
 
     public static SceneMeta of(int sceneId) {
         return new SceneMeta().load(sceneId);
@@ -64,8 +63,8 @@ public class SceneMeta {
             }
 
             this.blocks = blocks.stream().collect(Collectors.toMap(b -> b.id, b -> b));
-            SceneIndexManager.buildIndex(this.sceneBlockIndex, blocks, g -> g.min.toXZLongArray());
+            this.sceneBlockIndex = SceneIndexManager.buildIndex(2, blocks, SceneBlock::toRectangle);
-            SceneIndexManager.buildIndex(this.sceneBlockIndex, blocks, g -> g.max.toXZLongArray());
+
         } catch (ScriptException e) {
             Grasscutter.getLogger().error("Error running script", e);
             return null;

src/main/java/emu/grasscutter/utils/ConfigContainer.java

@@ -135,7 +135,8 @@ public class ConfigContainer {
         public int bindPort = 22102;
         /* This is the port used in the default region. */
         public int accessPort = 0;
-        
+        /* Entities within a certain range will be loaded for the player */
+        public int loadEntitiesForPlayerRange = 100;
         public boolean enableScriptInBigWorld = false;
         public boolean enableConsole = true;
         public GameOptions gameOptions = new GameOptions();

src/main/java/emu/grasscutter/utils/Position.java

@@ -2,6 +2,7 @@ package emu.grasscutter.utils;
 
 import java.io.Serializable;
 
+import com.github.davidmoten.rtreemulti.geometry.Point;
 import dev.morphia.annotations.Entity;
 import emu.grasscutter.net.proto.VectorOuterClass.Vector;
 
@@ -155,10 +156,20 @@ public class Position implements Serializable {
 			.setZ(this.getZ())
 			.build();
 	}
-	public long[] toLongArray(){
+	public Point toPoint(){
-		return new long[]{(long) x, (long) y, (long) z};
+		return Point.create(x,y,z);
 	}
-	public long[] toXZLongArray(){
+
-		return new long[]{(long) x, (long) z};
+	/**
+	 * To XYZ array for Spatial Index
+	 */
+	public double[] toDoubleArray(){
+		return new double[]{ x, y, z};
+	}
+	/**
+	 * To XZ array for Spatial Index (Blocks)
+	 */
+	public double[] toXZDoubleArray(){
+		return new double[]{x, z};
 	}
 }