Yes many different ways Ulco.
I made a very basic scene that you can download and try for yourself below.
Some time ago i thought if you use 2 or more twist and shear shaders that are exactly the opposite
if they would cancel themselves out or if there would be still be some effects of them to be seen.
There were some things that i did not understand why it happened.
*Open the scene and you will see a scene like in the first image.
*Enable the "01_Twist and shear shader"
node.It does exactly what it should.
*Then enable the "02_Surface layer" node.Nothing happens.
*Then enable the "02_Twist and shear shader".The X and Y values are -1 so exact the opposite of the "01_Twist and shear shader".
So you get the same scene as without any twist shader was added.
* Now go to the 02_Surface layer" and enable "Smoothing effect" in the "smoothing" tab. This is what me surprised.
It is more like a reset then smoothing (in this setup at least).
What you get is like the same as you disable the first surface layer and twist node.
* Go to the first "01_Twist and shear shader" and use bigger numbers in the "Lean factor" until you go very high
you won't see any difference and when you do it won't be in the direction you expect.
*If you restrict the slopes differently in the surface layers you get some expected sometimes not expect results too.
I don't know if it is only related to the smoothing effect or the twist shader.
If you use slope restrictions with more layers and twist shaders it is not the same behavior and the effects from the upper layers are still seen less or more. It looked to me depending on the surface layers used even if you use exact opposite twist nodes you still can get some different effects. This is not related to the smoothing effect it is more about the slope etc use....
So the twist shader can act as you said Ulco like a redirect shader too. But not sure if they look the same.
The thing i was curious was how opposite shaders act.
Sounds complicate to you? If you are new to Terragen it most probably sounds so.
I was nearly giving up to post this here.
There are so different settings that it gets overwhelming very fast to write and post pictures what this or that does.
Especially the last things i said. Documenting the workings of Terragen looks very hard when you go into things like this.
Some of the behavior changes very much for example when you change the Slope key to "Planet/object normal" in the Slope constraints tab.
[attachimg=1]
[attachimg=2]
[attachimg=3]
[attachimg=4]
[attachimg=5]
[attachimg=6]