Really nice code and video, but there's one concern to me:

So basically in your GPU implementation each thread controls one water droplet, but what if two droplets descend to the same area at the same time and their erosion/deposition range overlap? Having two threads updating the same pixel at the same time can lead to data incoherence.

I tried the simplest solution by adding atomic operations but it's rather a brute-force approach and the performance is underwhelming, and strange enough the final terrain looks no much different from the original one, maybe the chance of getting overlap is small and it doesn't matter?

There is another erosion model called cell-based erosion that assigns one thread per pixel and tracks the total amount of water content in a cell then divides the content evenly based on the flowing direction. We can use a technique namely virtual pipe to store the content independently for every outflowing direction and sync with one thread per pixel later. Unfotunately in particle erosion it doesn't seem possible. I am really running out of ideas.

I can't figure out how to run it, so far I've managed to get it running and a mesh generated. How do I get the program to generate terrain that the erosion can be run on, so far it's always flat.

i cant run this file

Im getting this error when building the terrain
"Thread group count is above the maximum allowed limit. Maximum allowed thread group count is 65535."

I just want to mention that if you try to get the node on a side that is not on the map you get an null pointer exception.

Otherwise a very good project. i am watching a lot of your videos and like them a lot. ^^

I'm getting the following error at load. How might I fix this so that I can run the program?

Assets/Editor/MeshEditor.cs(40,28): error CS1644: Feature `interpolated strings' cannot be used because it is not part of the C# 4.0 language specification.

It seems like I'm not using the right C# version or something?

Apparently the Unity Version predates 5.0 but have no idea which it is...

As it stands right now, I don't know what kind of projects this is. C#? Some kind of framework? How do I run it? Why isn't there a standalone?

I'm new to c# and am running from linux using monodevelop. Should there be a project file of some sort here? Sorry for the newb question.

Is this project still working? I've cloned it to try it out but it's not working due to a thread limit error

Thread group count is above the maximum allowed limit. Maximum allowed thread group count is 65535.

Is there a way to solve this?

Great code, only:

You seem to be missing the line "seed = (randomizeSeed) ? Random.Range( -10000, 10000 ) : seed;" from the GenerateHeightMapGPU function which is in the CPU version, needed to add it to allow randomizing.

The thread count for height generation can be too large for older GFX cards so you have to cut it into chunks - you could test for 64k max maybe rather doing 2048*2048 for example

Also I wonder if the height map gen can be made the same for both GPU & CPU to truly test them side by side as CPU is using basic perlin noise, GPU simplex.