coderEFE
commented
2 years ago I have the same issue as well. I use perspective camera and have some grass assets with a non-zero depth (z-axis) for a parallax effect, but adding the grass or foliage shaders usually makes the grass asset become fixed to a zero depth and removes the parallax effect. I played around with shader and found that creating variations of it with different velocity strengths and wind scales made some grasses stay at their depth, but it's pretty finicky. Hopefully this issue can be resolved, otherwise I may have to find another shader. Awesome shader though!
Essentially, I split the object's position into x, y, and z channels and only applied the shader vertex transformations to the x-channel, which prevents the shader from modifying the object's depth (z-axis). If you want the y-channel to be modified also, make sure to apply that channel from the Split to the Add node (I recommend pairing the x and y into a Vector2).
Notice that it transforms all channels of the object's position from a Vector3 out.
SETENTIAdev
I apologize if this was mentioned somewhere but does this only work with Orthographic camera? I use perspective camera for the parallax effect and I was wondering if this could be modified in some way to work with perspective camera, didn't know where else to reach so I figured I'd create an issue