PlaceSelectionOnSurface

Author: Jonathan Czeck (aarku)

Description

This wizard takes the current selection and raycasts downward from each object and moves them to where the raycast hit. It is useful for placing a lot of items on top of a terrain.

It is not bulletproof to say the least, but it provides a starting point.

Usage

Place this script in YourProject/Assets/Editor and a menu item will automatically appear in the GameObject menu after it is compiled.

C# - PlaceSelectionOnSurface.cs

using UnityEngine;
using UnityEditor;

public class PlaceSelectionOnSurface : ScriptableObject
{
	[MenuItem ("GameObject/Place Selection On Surface")]
	static void CreateWizard ()
	{
		Transform[] transforms = Selection.GetTransforms(SelectionMode.Deep |
			SelectionMode.ExcludePrefab | SelectionMode.OnlyUserModifyable);
		
		if (transforms.Length > 0 && EditorUtility.DisplayDialog("Place Selection On Surface?",
			"Are you sure you want to place " + transforms.Length +
			((transforms.Length > 1) ? " objects" : " object") +
			" on the surface in the -Y direction?", "Place", "Do Not Place"))
		{
			foreach (Transform transform in transforms)
			{
				RaycastHit hit;
				if (Physics.Raycast(transform.position, Vector3.down, out hit))
				{
					transform.position = hit.point;
					Vector3 randomized = Random.onUnitSphere;
					randomized = new Vector3(randomized.x, 0F, randomized.z);
					transform.rotation = Quaternion.LookRotation(randomized, hit.normal);
				}
			}
		}
	}
}