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extends Node3D
@export var width: int = 20
@export var height: int = 10
@export var depth: int = 20
@export var scale_x: int = 10
@export var scale_y: int = 6
@export var scale_z: int = 10
@export var radius: int = 5
@export var smooth_normal: bool = false
var map_grid: Array[float] = []
var random = RandomNumberGenerator.new()
func map_grid_get(x: int, y: int, z: int):
return map_grid[z*height*width + y*width + x]
func gen_map_grid():
map_grid.resize(width*height*depth)
map_grid.fill(1.0)
var noise = FastNoiseLite.new()
noise.noise_type = FastNoiseLite.TYPE_SIMPLEX
noise.frequency = 0.06
#noise.set_seed(0xDEADBEEF)
noise.set_seed(random.randi())
for z in depth:
for x in width:
var mid_x = x - width/2.0
var mid_z = z - depth/2.0
var pos_vec = Vector2(mid_x, mid_z)
var pos_radius = pos_vec.length()
var multiplier = 1.0 / (max(1, pos_radius - radius))
var gen_h = noise.get_noise_2d(x, z)
gen_h = remap(gen_h, -1, 1, 0, height)
gen_h = int(gen_h*multiplier*0.5)
for y in gen_h:
map_grid[z*height*width + y*width + x] = -100.0
func add_normal(tri_index: int, vertices: PackedVector3Array, normal_list: Array[Vector4]):
var vertex_index: int = 0
while vertex_index < len(vertices):
if vertex_index == tri_index:
vertex_index += 1
continue
var orig_vert = vertices[tri_index]
var vert = vertices[vertex_index]
if orig_vert.is_equal_approx(vert):
normal_list[tri_index] += normal_list[vertex_index]
vertex_index += 1
func place_objects(num_objects: int, object: PackedScene):
var space = get_world_3d().direct_space_state
var object_num: int = 0
while object_num < num_objects:
var cast_pos = Vector3(random.randf_range(0, width*scale_x), height*scale_y, random.randf_range(0, depth*scale_z))
var cast_dest = Vector3(cast_pos.x, 0, cast_pos.z)
var query = PhysicsRayQueryParameters3D.create(cast_pos, cast_dest)
var result = space.intersect_ray(query)
if result:
# If the object is water, don't place anything
if result.collider == $Water:
continue
# Don't spawn objects on hills that are too steep
if result.normal.dot(Vector3(0, 1, 0)) < 0.8:
continue
var pos = result.position
var new_tree = object.instantiate()
new_tree.position = pos
add_child(new_tree)
object_num += 1
# Called when the node enters the scene tree for the first time.
func _ready():
random.randomize()
gen_map_grid()
var vertices = PackedVector3Array()
var normals = PackedVector3Array()
# Initialize the ArrayMesh.
var arr_mesh = ArrayMesh.new()
var arrays = []
arrays.resize(Mesh.ARRAY_MAX)
arrays[Mesh.ARRAY_VERTEX] = vertices
arrays[Mesh.ARRAY_NORMAL] = normals
var cell = MarchingCubes.Cell.new()
for z in range(-1, depth):
for y in range(-1, height):
for x in range(-1, width):
var grid = [
[x, y, z],
[x + 1, y, z],
[x + 1, y + 1, z],
[x, y + 1, z],
[x, y, z + 1],
[x + 1, y, z + 1],
[x + 1, y + 1, z + 1],
[x, y + 1, z + 1],
]
for i in grid.size():
if grid[i][0] >= width or grid[i][1] >= height or grid[i][2] >= depth or \
grid[i][0] < 0 or grid[i][1] < 0 or grid[i][2] < 0:
cell.value[i] = 1.0
else:
cell.value[i] = map_grid_get(grid[i][0], grid[i][1], grid[i][2])
cell.position[i] = Vector3(grid[i][0]*scale_x, grid[i][1]*scale_y, grid[i][2]*scale_z)
MarchingCubes.march_cube(cell, vertices)
var tri_index = 0
var normal_list: Array[Vector4] = []
normal_list.resize(len(vertices))
normal_list.fill(Vector4(0,0,0,0))
while tri_index < len(vertices):
var p1 = vertices[tri_index + 0]
var p2 = vertices[tri_index + 1]
var p3 = vertices[tri_index + 2]
var normal = (p2 - p3).cross(p1 - p3).normalized();
var normal_4 = Vector4(normal.x, normal.y, normal.z, 1)
normal_list[tri_index + 0] += normal_4
normal_list[tri_index + 1] += normal_4
normal_list[tri_index + 2] += normal_4
tri_index += 3
if smooth_normal:
var vert_index = 0
while vert_index < len(vertices):
add_normal(vert_index, vertices, normal_list)
vert_index += 1
for normal in normal_list:
var real_normal = Vector3(normal.x, normal.y, normal.z) / normal.w
normals.push_back(real_normal.normalized())
# Create the Mesh
arr_mesh.add_surface_from_arrays(Mesh.PRIMITIVE_TRIANGLES, arrays)
#var material = preload("res://materials/terrain.tres")
#arr_mesh.surface_set_material(0, material)
var m = MeshInstance3D.new()
m.mesh = arr_mesh
var col_mesh = arr_mesh.create_trimesh_shape()
var collision_shape = CollisionShape3D.new()
collision_shape.set_shape(col_mesh)
var static_body = StaticBody3D.new()
static_body.collision_layer = 0b101
static_body.add_child(collision_shape)
static_body.add_child(m)
add_child(static_body)
var tree_prefab = preload("res://prefab/tree.tscn")
var num_trees = random.randi_range(5, 15)
var rock_prefab = preload("res://prefab/rock.tscn")
var num_rocks = random.randi_range(5, 15)
place_objects(num_trees, tree_prefab)
place_objects(num_rocks, rock_prefab)
# Called every frame. 'delta' is the elapsed time since the previous frame.
func _process(_delta):
pass
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