Each chunk is a StaticBody3D with each block having its own CollisionShape3D for collisions. The meshes are created using SurfaceTool which allows specifying vertices, triangles, and UV coordinates for constructing a mesh.

The chunks and chunk data are stored in Dictionary objects. New chunks have their meshes drawn in separate Threads, but generating the collisions is done in the main thread, since Godot does not support changing physics objects in a separate thread. There are two terrain types, random blocks and flat grass. A more complex terrain generator is out-of-scope for this demo project.

The player can place and break blocks using the RayCast3D node attached to the camera. It uses the collision information to figure out the block position and change the block data. You can switch the active block using the brackets or with the middle mouse button.

There is a settings menu for render distance and toggling the fog. Settings are stored inside of an AutoLoad singleton called "Settings". This class will automatically save settings, and load them when the game opens, by using the FileAccess class.

Sticking to GDScript and the built-in Godot tools, as this demo does, is quite limiting. If you are making your own voxel game, you should probably use Zylann's voxel module instead: https://github.com/Zylann/godot_voxel

Screenshots

Licenses

Textures are from Minetest Game.

Copyright information for textures reused from Minetest Game

While most textures are under CC BY-SA 3.0, some are under CC0 1.0

Cisoun's texture pack (CC BY-SA 3.0):

default_stone.png
default_leaves.png
default_leaves_simple.png
default_tree.png
default_tree_top.png

celeron55, Perttu Ahola celeron55@gmail.com (CC BY-SA 3.0)

default_mineral_iron.png
default_mineral_coal.png
default_bookshelf.png

VanessaE (CC BY-SA 3.0):

default_sand.png

Calinou (CC BY-SA 3.0):

default_brick.png

PilzAdam (CC BY-SA 3.0):

default_mineral_gold.png

jojoa1997 (CC BY-SA 3.0):

default_obsidian.png

InfinityProject (CC BY-SA 3.0):

default_mineral_diamond.png

Zeg9 (CC BY-SA 3.0):

default_coal_block.png

paramat (CC BY-SA 3.0):

default_bush_stem.png
default_grass_side.png -- Derived from a texture by TumeniNodes (CC-BY-SA 3.0)
default_mese_block.png

TumeniNodes (CC BY-SA 3.0):

default_grass.png

Blockmen (CC BY-SA 3.0):

default_wood.png

sofar (CC0 1.0):

default_gravel.png -- Derived from Gambit's PixelBOX texture pack light gravel

Neuromancer (CC BY-SA 3.0):

default_furnace_bottom.png
default_furnace_side.png
default_cobble.png, based on texture by Brane praefect
default_mossycobble.png, based on texture by Brane praefect

Gambit (CC BY-SA 3.0):

default_diamond_block.png

kilbith (CC BY-SA 3.0):

default_steel_block.png
default_gold_block.png
default_mineral_tin.png

Mossmanikin (CC BY-SA 3.0):

default_fern_3.png

random-geek (CC BY-SA 3.0):

default_dirt.png -- Derived from a texture by Neuromancer (CC BY-SA 3.0)

Krock (CC0 1.0):

default_glass.png