[UNITY] How do I properly displace the top of a mesh?

Duckmamoll

Hello,

I'm in the process of learning unity's shadergraph, so I tried to make a simple snow shader that displaces the mesh top where the snow is. However the displacement isn't based on the world position, but based on the mesh rotation (it always displaces it following the green arrow (Y axis)). I tried a lot of things. I followed a tutorial about displacing the top of the mesh, but it doesn't work.

I am using unity 2019.2.13f1
 


Thank you for reading  

Obscura

Get the vertex normals, and use the Z of it. Thats the up/down direction. Or maybe in Unity, Y is the vertical axis. I'm coming from Unreal where Z is the up.

Duckmamoll

I have no idea how to get the vertex normals, does anybody know what node can get it?

Obscura

I think you are already using it but not the right way. Its the "normal vector".  Just lerp between no displacement/displacement based on the normal gradient.

Duckmamoll

I have no idea how this works, I know the basics on lerping, but I don't understand at all what you're telling me to do



I did this, but I don't know if this is what you're telling me to do. Because it doesn't work

Obscura

Position is not needed at all. I'll make a mockup and post a picture.

Obscura

Duckmamoll

I don't understand what's the mask you're using so far this does nothing

Obscura

the "mask" is the z component of the normal vector. You can use the "split" node like on your picture, and take the 3rd output(B).

Obscura

Obscura

Maybe in Unity, its not the B but the G. Try both.

Duckmamoll

I've tried all combinaison of red blue and green with all different type of space (object world tangent and view) and in every cases it just renders my mesh invisible

Duckmamoll

I've also tried the same with  a position node instead of a normal vector, same everything is just invisible
However it does output this blue thing


And i've also tried to change the value of the vector 3 from 0 0 1 to 0 1 0 with both the normal vector and position node and I still have thesame outcome

Obscura

Sorry bro but I can't help more.

Duckmamoll

I understand Thank you for trying to help me that was very kind of you