Godot marching cubes

This is a demo of multiplayer marching cubes game in godot.

Features

• Procedural world generation with biomes
• Blending different materials
• Water
• Day night cycle
• Multiplayer
• Voxel placing and removing

Testing

• To run the project open it in godot and run it, two windows will open.
• In one window you can enter singleplayer, the other is to test multiplayer.
• Connect to the singleplayer world using port 5000.

Adding new voxels

• Create a new class that extends Voxel under the "voxel" folder
• Give it a unique ID and register it in "Main.cs"
• If you're using textures add the uniforms in "terrain.gdshader" and assign the textures in node "Mesh" that is inside "chunk.tscn"
• Add it into "terrain.gdshader" under getVoxelColor like so:

  if (voxelId == {the id}) {
      hasNormal = true;
      normalTex = sampleTex({your normal texture}, {your wall normal texture}, {uv scale}, position, normal).xyz;
      return sampleTex({your texture}, {your wall texture}, {uv scale}, position, normal).xyz;
  }
  

Adding new biome

• Create a new class that extends Biome under the "world_generator/biome" folder
• Optional: You can call base({your base height}, {your height variation})
• Implement the GetVoxel method
• Add your biome to GetBiome in the "WorldGenerator" class

Adding new surface mesh

• Save the geometry as a ".res" file under "voxel/surface_mesh"
• Save the texture as ".png" in the same place
• In "Main.cs" load your mesh and texture
• Instantiate the surface mesh material (res://shaders/surface_mesh.tres) and assign your texture to the parameter "color"

// Example
Mesh grass = ResourceLoader.Load("res://voxel/surface_mesh/grass.res");
ShaderMaterial grassMat = ResourceLoader.Load("res://shaders/surface_mesh.tres");
grassMat.SetShaderParameter("color", ResourceLoader.Load("res://voxel/surface_mesh/grass.png"));
SurfaceMesh.SurfaceMeshes.Add(GrassVoxel.ID, new SurfaceMesh(grass, grassMat));

Optimizing performance for older hardware

You can play with the in-game settings, lower mesh count and render distance.

Or:

In "world/Chunk.cs" -> Generate(bool selfOnly) I smooth the geometry by subdividing, this is optional. Remove these lines:

// Optional
GeometrySmoothing.SubdivideGeometry(positions, indices);
GeometrySmoothing.SmoothGeometry(positions, indices);
GeometrySmoothing.SubdivideGeometry(tranPositions, tranIndices);
GeometrySmoothing.SmoothGeometry(tranPositions, tranIndices);