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This is a paid asset, but now you can download HQ Photographic Textures Grass Pack Vol.2 Free.
HQ Photographic Textures Grass Pack Vol.2
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This Pack contains of 140 Unique High Quality Grass Textures directly settled for using in Unity 5 (Alpha Blending adjusted, Perfect Background Color & Alpha Transparency).
From 4K(4096×4096), the Textures Files are compressed in 2K(2048p) in the Engine.
As the First Pack, they were all realized from Real Life Photos.
By using the Unity 5 Native Builds, Terrain Editors, Grass Shaders or any others Assets, the Textures are compatible and can be edited too in your own 2D/3D Softs.
For more informations, support:
Unity Forum Thread
Coupled to the Vol.1, you will have much more choices to combine and create your own Grass World.
Important: The Screenshots are made with others Assets, only the Grasses are included in the Pack.
Enjoy!