I'd also say animated UV's. Would probably work with projecting a planar UV on the ground and retaining the planar projection history so that you could animate it.
When creating a material/shader and using file textures you also get Texture2D nodes as input nodes to the file textures. It's these Texture2D nodes that hold the values you can use to animate the UV's. I think it's the offset UV values you can use.
This will "scroll" the texture as a whole. For certain parts of an uv and special movement pattern's I'd look at my second suggestion.
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This will "scroll" the texture as a whole. For certain parts of an uv and special movement pattern's I'd look at my second suggestion.
I'm fairly certain that I just used the Offset UV values of a Texture2D for this one.
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