Improved performance

client/test/multimeshgrid/Generate.gd

@@ -0,0 +1,83 @@
+extends Node3D
+
+@export var tree: Mesh
+@export var leaves: Mesh
+@export var noise: Noise
+@export var size_x: float
+@export var size_z: float
+@export var step: float = 1
+@export var density: float
+@export var position_randomness := 1.0
+
+const TILE_SIZE := 10
+
+func _ready():
+	if !visible:
+		return
+
+	var total_count := 0
+	var tile_count := 0
+
+	var old_tile_x := NAN
+	var old_tile_z := NAN
+
+	var offsets: Array[Vector3] = []
+
+	for x in range(-size_x, size_x, step):
+		for z in range(-size_z, size_z, step):
+			if noise.get_noise_2d(x, z) < 1 - density * 2:
+				continue
+			
+			var tile_x := x / TILE_SIZE
+			var tile_z := z / TILE_SIZE
+
+			if tile_x != old_tile_x || tile_z != old_tile_z:
+				if tile_count > 0:
+					var tile := make_tile(old_tile_x, old_tile_z)
+					tile.multimesh.instance_count = tile_count
+					tile.multimesh.visible_instance_count = tile_count
+
+					for i in range(tile_count):
+						tile.multimesh.set_instance_transform(i, Transform3D(Basis(), offsets[i] - tile.position))
+					
+					add_child(tile)
+
+					var tile2 := make_tile(old_tile_x, old_tile_z)
+					tile2.multimesh.mesh = leaves
+					tile2.multimesh.instance_count = tile_count
+					tile2.multimesh.visible_instance_count = tile_count
+
+					for i in range(tile_count):
+						tile2.multimesh.set_instance_transform(i, Transform3D(Basis(), offsets[i] - tile.position))
+					
+					add_child(tile2)
+
+					tile_count = 0
+					offsets.resize(0)
+
+			old_tile_x = tile_x
+			old_tile_z = tile_z
+			
+			var offset := Vector3.ZERO
+			offset.x = x + (randf() - 0.5) * position_randomness
+			offset.z = z + (randf() - 0.5) * position_randomness
+			offsets.append(offset)
+
+			tile_count += 1
+			total_count += 1
+	
+	print("Generated %d trees" % total_count)
+
+func make_tile(x, z) -> MultiMeshInstance3D:
+	prints("Tile:", x * TILE_SIZE, z * TILE_SIZE)
+
+	var instance := MultiMeshInstance3D.new()
+	instance.multimesh = MultiMesh.new()
+	instance.multimesh.mesh = tree
+	instance.multimesh.transform_format = MultiMesh.TRANSFORM_3D
+	
+	var safe_area := Vector3(0, 0, 0)
+	instance.position = Vector3(x * TILE_SIZE, 0, z * TILE_SIZE)
+	instance.custom_aabb.position = -safe_area
+	instance.custom_aabb.size = Vector3(TILE_SIZE, 30, TILE_SIZE) + safe_area * 2
+	return instance