Requirements

Requirement	Notes
Unity 6	Unity 6000.0 or newer. Developed on Unity 6000.6 with URP 17.6, and tested as a buyer installs it on 6000.0 with URP 17.0 and on 6000.6; also built and run on 6000.4 with URP 17.4.
Universal Render Pipeline (URP) 17	The Built-in Render Pipeline and HDRP are not supported.
com.unity.splines, com.unity.mathematics	Installed automatically as dependencies. Splines are used by spline grass.
Light Cookies enabled on the URP asset	Needed for cloud shadows only. Without it the clouds still draw in the sky, but cast no shadow.
Compute shaders	Needed for full grass speed. Without them grass falls back to a slower CPU path automatically. See Platforms and performance.
Input System (optional)	The Core Demos sample uses it when it is installed, and the legacy Input Manager otherwise. Fable itself does not read input.

Layers. Fable needs nothing in your layer setup, but two settings use layer indices:

• Terrain blending colours the grass from a top-down capture of the layers in the quality asset's Terrain Map > Layer Mask. The shipped preset captures Default. For a cleaner map, put the ground on a layer of its own and pick only that one, so props and characters stay out of the capture.
• Grass draws on layer 10 (Grass Render Layer, in the same section). It works unnamed. If your project already uses layer 10 for something else, pick another free layer.