Procedural Stochastic Terrain Shader

A simple procedural terrain shadergraph for Unity's inbuilt terrain system

Get it here: https://github.com/michael-evan-allison/Procedural-Stochastic-Terrain-Shader

Tested In: Unity URP 2022.2.2f1, Unity URP 2022.2.9f1

Version History

• 01/02/2023 - Stochastic now seemlessly textures across neighbour terrains
• 31/01/2023 - Added stochastic node option
• 25/01/2023 - Initial commit

Features

• Detail and Distance textures
• Five detail textures (shore/sea, ground, mountain, peak, cliff)
• Five distance textures (shore/sea, ground, mountain, peak, cliff)
• Automatically transitions between textures according to height (shore/sea, ground, mountain, peak) and angle (cliff)
• Tri-Planar for cliffs (to prevent texture warping)
• Two different blend modes between detail and distance textures:
  1. Overlay blend (combines distance and detail textures together)
  2. Transition (seemlessly transitions between distance and detail textures according to camera distance)
• Automatic generation of normal maps (it's a bit hacky but it works)
• Smoothness, Metallic, Normal and Color settings for each individual texture
• Seemlessly transitions between normal, smoothness, and metallic settings based on camera distance
• Use noise to variegate ground layer between ground texture and mountain texture
• Doesn't need splatmaps, great for procedural terrain
• Optional stochastic (antitiling) option (now tiles seemlessly across neighbour terrains)

Distance

Detail

Distance

Detail

Distance

Detail

Stochastic Off

Stochastic On

How To Use

1. Add the shader and sub-shaders to your project
2. Create a new terrain
3. Create a material
4. Set material shader to Terrain Shadergraph (Shader Graphs -> Terrrain Shadergraph)
5. Add the material to the terrain settings in the inspector
6. Add your textures in the material inspector

Some Hints and Tips

• The texture height is set relative the terrain texture height i.e. if your terrain is set 600 height all your texture heights will be lower than this.
• Normals for distance textures need to be A LOT HIGHER than detail textures, a detail texture normal will normal be between 1-5 but distance texture will be between 2000-3000
• For height textures (shore/sea, ground, mountain, peak) the scaling is as you would expect. For detail textures 2000 means that the texture will be tiled 2000 times across the terrain, whereas 1 for distance textures means that the texture will stretch to cover the whole terrain, BUT because of Tri-Planar cliff scaling is inverted so you will be typing in values like 0.005 or 0.1.

I have included a bunch of examples in the 'Examples' folder. This folder is not essential and can be deleted.

Credits

• I used some custom height blending code by GrrrimReapz on Reddit: https://www.reddit.com/r/Unity3D/comments/pr6sld/height_blending_materials_in_shadergraph/
• I implemented some of Snubber's ideas from his video on youtube: https://www.youtube.com/watch?v=uJSxqr3a0cA&ab_channel=Snubber
• I implemented Junior_Djjr stochastic node, which can be found here: https://github.com/JuniorDjjr/UnityProceduralStochasticTexturingNode
• Textures in example files from textures.com

Licensed under Apache 2.0