Added grass growth using random ticks

project/blocky_game/blocks/voxel_library.tres

@@ -22,24 +22,28 @@ collision_aabbs = [ AABB( 0, 0, 0, 1, 1, 1 ) ]
 voxel_name = "grass"
 geometry_type = 2
 custom_mesh = ExtResource( 1 )
+random_tickable = true
 collision_aabbs = [ AABB( 0, 0, 0, 1, 1, 1 ) ]
 
 [sub_resource type="Voxel" id=4]
 voxel_name = "log_x"
 geometry_type = 2
 custom_mesh = ExtResource( 4 )
+random_tickable = true
 collision_aabbs = [ AABB( 0, 0, 0, 1, 1, 1 ) ]
 
 [sub_resource type="Voxel" id=5]
 voxel_name = "log_y"
 geometry_type = 2
 custom_mesh = ExtResource( 3 )
+random_tickable = true
 collision_aabbs = [ AABB( 0, 0, 0, 1, 1, 1 ) ]
 
 [sub_resource type="Voxel" id=6]
 voxel_name = "log_z"
 geometry_type = 2
 custom_mesh = ExtResource( 5 )
+random_tickable = true
 collision_aabbs = [ AABB( 0, 0, 0, 1, 1, 1 ) ]
 
 [sub_resource type="Voxel" id=7]

project/blocky_game/blocky_game.gd

@@ -10,3 +10,4 @@ func _unhandled_input(event):
 			if event.scancode == KEY_L:
 				# Toggle shadows
 				_light.shadow_enabled = not _light.shadow_enabled
+

project/blocky_game/blocky_game.tscn

@@ -1,4 +1,4 @@
-[gd_scene load_steps=13 format=2]
+[gd_scene load_steps=14 format=2]
 
 [ext_resource path="res://blocky_game/blocks/voxel_library.tres" type="VoxelLibrary" id=1]
 [ext_resource path="res://blocky_game/blocks/terrain_material.tres" type="Material" id=2]
@@ -9,6 +9,7 @@
 [ext_resource path="res://blocky_game/blocks/stairs/stairs_nx.obj" type="ArrayMesh" id=7]
 [ext_resource path="res://blocky_terrain/debug_info.gd" type="Script" id=8]
 [ext_resource path="res://blocky_game/blocks/terrain_material_foliage.tres" type="Material" id=9]
+[ext_resource path="res://blocky_game/random_ticks.gd" type="Script" id=10]
 
 [sub_resource type="ProceduralSky" id=1]
 sky_top_color = Color( 0.268204, 0.522478, 0.847656, 1 )
@@ -52,6 +53,7 @@ environment = SubResource( 2 )
 stream = SubResource( 3 )
 voxel_library = ExtResource( 1 )
 viewer_path = NodePath("../CharacterAvatar")
+generate_collisions = false
 material/0 = ExtResource( 2 )
 material/1 = ExtResource( 3 )
 material/2 = ExtResource( 9 )
@@ -65,6 +67,7 @@ script = ExtResource( 8 )
 
 [node name="MeshInstance" type="MeshInstance" parent="."]
 transform = Transform( 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 7.3175 )
+visible = false
 mesh = ExtResource( 7 )
 material/0 = null
 
@@ -74,3 +77,6 @@ gravity = 40.0
 jump_force = 8.0
 head = NodePath("../CharacterAvatar/Camera")
 terrain = NodePath("../VoxelTerrain")
+
+[node name="RandomTicks" type="Node" parent="."]
+script = ExtResource( 10 )

project/blocky_game/random_ticks.gd

@@ -0,0 +1,82 @@
+# Implements random cellular automata behavior of the terrain,
+# such as growth of grass and crops, fire etc.
+
+extends Node
+
+# Takes effect in a large radius around the player
+const RADIUS = 100
+# How many voxels are affected per frame
+const VOXELS_PER_FRAME = 256
+
+onready var _terrain = get_node("../VoxelTerrain")
+onready var _avatar = get_node("../CharacterAvatar")
+onready var _voxel_tool = _terrain.get_voxel_tool()
+
+var _grass_dirs = [
+	Vector3(-1, 0, 0),
+	Vector3(1, 0, 0),
+	Vector3(0, 0, -1),
+	Vector3(0, 0, 1),
+	Vector3(-1, 0, -1),
+	Vector3(1, 0, -1),
+	Vector3(-1, 0, 1),
+	Vector3(1, 0, 1),
+	
+	Vector3(-1, 1, 0),
+	Vector3(1, 1, 0),
+	Vector3(0, 1, -1),
+	Vector3(0, 1, 1),
+	Vector3(-1, 1, -1),
+	Vector3(1, 1, -1),
+	Vector3(-1, 1, 1),
+	Vector3(1, 1, 1),
+
+	Vector3(-1, -1, 0),
+	Vector3(1, -1, 0),
+	Vector3(0, -1, -1),
+	Vector3(0, -1, 1),
+	Vector3(-1, -1, -1),
+	Vector3(1, -1, -1),
+	Vector3(-1, -1, 1),
+	Vector3(1, -1, 1)
+]
+
+
+func _ready():
+	_voxel_tool.set_channel(VoxelBuffer.CHANNEL_TYPE)
+
+
+func _process(delta):
+	#var time_before = OS.get_ticks_usec()
+
+	_grass_dirs.shuffle()
+
+	var center = _avatar.transform.origin.floor()
+	var r = RADIUS
+	var area = AABB(center - Vector3(r, r, r), 2 * Vector3(r, r, r))
+	_voxel_tool.run_blocky_random_tick(
+		area, VOXELS_PER_FRAME, funcref(self, "_random_tick_callback"), 16)
+
+	#var time_spent = OS.get_ticks_usec() - time_before
+	#print("Spent ", time_spent)
+
+
+func _random_tick_callback(pos: Vector3, value: int):
+	if value == 2:
+		# Grass
+		var attempts = 1
+		var ra = randf()
+		if ra < 0.15:
+			attempts = 2
+			if ra < 0.03:
+				attempts = 3
+
+		for i in attempts:
+			for di in len(_grass_dirs):
+				var npos = pos + _grass_dirs[di]
+				var nv = _voxel_tool.get_voxel(npos)
+				if nv == 1:
+					var above = _voxel_tool.get_voxel(npos + Vector3(0, 1, 0))
+					if above == 0:
+						_voxel_tool.set_voxel(npos, 2)
+						break