Question VFX Graph - Copy ground shader on a top of a particle mesh

Hello.

I think what you want to achieve is doable and can be more or less tricky based on your needs.
First you want the Surface to "Match" between the Ground and the Particle Mesh.

Based on the Number Of Ground/levels the approach can be drastically different.

Does all the VFX are gonna have the Same Mesh ?
Does they all gonna have the same Behavior ? (maybe a Snowy patch will be lighter than a Rocky ground etc..)

Let's say you have 5 different Ground/levels and you want the VFX to feel unique for each environment, you might gonna need to Create separate VFX, to create Visual and Behavior specific and unique for each levels.

But If you have 15 different levels or more... Maybe creating unique variation is gonna be time consuming and you need to take a more procedural approach.


To Match the Ground I guess that using the "WorldPosition" as Uvs would be the way to go.
This Way You could Have Perfectly Matching Patterns between the ground and the VFXMesh.
You can have more infos over here


To avoid the Sliding, you can use the "ObjectPosition" and Subtract it to the Uvs, so that the Pattern Stay in Place.

In the case of the VFXGraph, the "ObjectPosition" that is Subtracted should be instead the Particles Position.
You can do this by creating an "Expose Properties" vector and Feed the Particle Position in VFXGraph.

 

So if you don't have a lot of Grounds/Lvls and that you have time to make all the VFXGraph Variants, you'll "only" need to spawn/fire the corresponding VFXGraph depending on the Levels.

But you can also go on a more "Procedural/modular" approach...
You should be able to create one VFXGraph with some Parameters...

Example :
You can Create an Exposed Properties, and Change it through script when "Firing"the VFXGraph.

This Way you should be able to pass this Infos to the Shader, and Switch Textures.

But maybe you need different Shader based on the Level/Ground...
In this Case, you could use the same Approach, but add Several "Output" and use of them based on this Exposed Properties.

Note that if the Number of Levels is high, this approach might be bad for performances..

The nice thing, is that editing/updating one VFXGraph of Ground will propagate to all the different ground type

I don't know if it's answer all your questions, but I hope that I will help a little.
I guess what you really should keep in mind is that the "Best Solution/approach" is dependent on your needs/use case. You really need to properly "frame" what you want to achieve, what really matter (Visual ?Ability to easily update all VFXG Grounds etc...) as each Solution have their Strength and Weakness.