Here is some info to make Vertical Fog Copy the Shader files to this location on a Mac within the app file, not sure what it is on Windows but somewhere in the install folder. Keep a copy of your old ones as you need them to make BB work as it would normally. Contents\Resources\Shaders If you want to change the look or colour then the code is towards the bottom. There are limitations on the shader changes as the parameters come from BB and there is no access to that.
In windows C:\Program Files (x86)\Buildbox3\shaders copy and replace. And thank you very much for this one mate!!!!!
No, available shaders have changed at some point but this is a good starting point to create your own shaders