This is a paid asset, but now you can download Wasteland (Built-In) Free.
Detail this asset from Unity Store: Original Link
Wasteland (Built-In) v1.0
“If possible, please buy the package to support the developer”
◼ PRODUCT DESCRIPTION ◼
Create desolate, apocalyptic landscapes with this enormous kit’s vast array of complex, stacked structures intertwined with nasty trailers, broken down vehicles, ramshackle warehouses, and even destroyed airplanes and oil tankers! Buses, pipes, dams, oil drums, shipping containers, factory chimneys, and much more await you inside this gigantic kit of epic devastation!
Designed by Sebastian Luca, modeled by Jakub Vondra, and texturing by Alexey HrDesign, with cover art by Ken Fairclough.
◼ A MESSAGE FROM KITBASH3D ◼
Proceed with creativity! You are about to purchase a 3D asset kit that includes elements to set the scene as you build your world, whether it’s for video games, film, television, design, or art. These completely customizable assets will serve as the building blocks to help you create an original environment.
◼ KEY FEATURES ◼
-61 Assets
-339 Meshes
-29 PBR Materials
-87 Textures
-4096×4096 Texture Maps
-2.1m Polys
◼ COMPATIBILITY ◼
– Works in Unity 2019.3.13 and above.
– HDRP/Built-In versions are freely upgradeable to Unity customers.
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 – Free Download){kind=link}