Procedural Stochastic Terrain Shader for Unity Terrain [Free on GitHub]

Procedural Stochastic Terrain Shader

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

Get it here: https://github.com/MichaelEGA/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) node implemented









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/@Snubber18
- 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

 

Just added a stochastic option (anti-tiling) using Junior_Djjr stochastic node.

Stochastic Off


Stochastic On

 

Just updated the stochastic texturing so that it tiles over neighbour terrains and doesn't leave a line.

 

Hi Michael, looks awesome. What would be the usage license on this?

 

Hello! Apologies, thought I had added that in: Apache License 2.0. Just added the LICENSE file to GitHub.

So go for broke basically...

 

Honestly i don't understand why but in this shader only work shore/sea and cliff the others seems to do absolutely nothing. I tried to manage some of distance parameter but it doesn't change anything. What am i doing wrong or is this a bug?

 

Hey, thanks for trying.

I'd need to see a picture of your set up to know if something is going wrong.

Have you tried using some of the sample materials the pack comes with?