This one provides you with a workflow with blender for creating splatmap mesh terrains which can be used to create overhangs / caves / etc. (one of the advantages)
You can find many more tutorials on my channel! You can also find the project files in the description.
I’m looking for more material about splatmap in Unity.
Mainly how to create a shader to insert 8 different textures and be able to rotate the ‘brush’ in-game.
Any ideas where I can find content like this?
Hmm…
Well, you could take a look on Terrain Tools - and how they do it.
But essentially it involves a lot of code and compute shaders for brush operations - so it is better to first get a better understanding of those before moving on to implement it yourself.
That is at least my take on this 