Detail this asset from Unity Store: Original Link
This is a paid asset, but now you can download Winter Nature Free.
Winter Nature v1.0
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Beautiful and high quality set of winter vegetation. Suitable for creating landscapes of any complexity. Mountains, snow forests, etc. It includes procedural shaders for generating snow on objects, and procedural shaders for landscapes.
Attention
Beginning with the version of Unity 2018, the support for the ShaderForge is terminated, so the shaders in new versions may not work properly.
If you have problems with shaders on versions 2017 and 2018, then you can update them here:Dropbox
Or you can download the latest version of ShaderForge (free now) and customize the materials yourself.
This pack includes:
– automatic terrain shader
– 34 meshes
– 76 texures
– Texture Sizes from 4096×4096 to 256×256
– 2 demo scenes include
– Range of Tris (Min and Max) – 12-23793 tris
– All meshes have a LOD and collision
Web preview (textures are reduced to 512×512 for fast downloads) : Mountains
Read more about the terrain you can read here
Shaders created in Shader Forge