GODOT 4 3D Terrain Editor (C# Plugin) (GPU Based)

Tool is written for prototyping in c# but will be converted to c++ for the godot core.

Needs a master godot 4 build with mono!

Read at first

The terrain is splited in a patch grid (int x, int y) to make the terrain on the fly extensible.
Each patch has a constant number of 16 chunks.
Each chunk have a chunk size of power of 2 - 1.

Install

1. Copy all files to addons/TerrainPlugin
2. Enable it
3. Have fun :-)

Screenshots

Currently supported

• Sculpting
  • Holes
  • Flatten
  • Noise
  • Sculpting
  • Smoothing
• Painting
  • On each splatmap channel
• Brushes
  • Smooth, Linear, Spherical, Tip by given radius, strength and fallof
• Importing and exporting heightmaps and splatmaps for 16bit raw images (industrial default)

Import formats

Currently the tool supports 4 kinds of importing heightmaps.

• R16
  • Importing heightmaps by a 16 Bit (L8) Format (Industrial deault)
• RGBA8_Half
  • Importing heightmaps by a RGBA 8Bit Image which splitted the height on the RED and GREEN Channel (16bit)
• RGBA8_NORMAL
  • Is the format which the editor is using (RED = 8 bit height, GREEN = +8 extrabit, BLUE = normal.x, ALPHA = normal.z)
• RGB_FULL
  • Importing heightmaps by a RGB 8Bit Image which is using 24bit (Mapbox used that one)

Mapbox Support

• Adding a custom node "TerrainMapBox3D" which can downloading datas directly from mapbox and draw it as a terrain

Internal format

• Heightmap
  • Format: RGBA8
  • Channel R: 8 bit Height
  • Channel G: +8 extrabit Heigt
  • Channel B: Normal X
  • Channel A: Normal Z
  • Normal.ONE = HOLE
• Splatmaps
  • Format: RGBA8
  • Channel R to A = Layer 0 - 3

Visual Shader Nodes

• TerrainGeneratorNode for Vertex Shader
  • Node to generation vertex, normals, binormals and tangents for the fragment shader based on the heightmap
• TerrainAntiTilingNode for Fragment Shader
  • Effecting the uv rotation of a TerrainTexturePack to reduce the tiling by small randomly rotation
• TerrainDepthBlendingNode for Fragment Shader
  • Mixing two TerrainTexturePacks by a given mix value in depth
• TerrainTexturePack and TerrainTextureUnpack for Fragment and Vertex Shader
  • Returns a Transform (mat4) by using Albedo, Normal, Roughness, AO and Heightmap.
• TerrainDefaultMaterial for Fragment Shader
  • Returns the default material for the editor
• TerrainSplatmapData for Fragment Shader
  • Returns the value of a given splatmap layer

Todo

• Setup automatic lod level by camera distance
• Create blank terrain shader template by a button (create terrain shader)
• Move to native