Adding terrain to a scene in Unity doesn't directly involve adding it to a plane. Instead, you typically create a Terrain object, which replaces the need for a simple plane when you want realistic landscapes. Here's how to do it:
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Right-Click in the Hierarchy: In the Unity Editor, go to the "Hierarchy" window. Right-click anywhere within the window.
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Select 3D Object -> Terrain: From the context menu that appears, navigate to "3D Object" and then select "Terrain". This creates a new Terrain object in your scene. Alternatively, you can select “GameObject” at the top of the Unity editor, then select “3D Object→Terrain”.
That's it! Unity creates a basic terrain object in your scene. You can then use the Terrain tools (found in the Inspector window when the Terrain object is selected) to sculpt the terrain, add textures, paint details, add trees, and more. The plane object that you might have been intending to use is no longer required, and can be deleted from your scene. The Terrain object takes its place, providing far greater capabilities for creating realistic environments.
