SpawnUtilities.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

// @kurtdekker random spawn utilities from my Jetpack Kurt game (And other games)
public static class SpawnUtilities
{
	public static bool ProgressiveLiftAndCastDown( ref Vector3 position, out Vector3 normal)
	{
		Vector3 pos = position;

		normal = Vector3.up;

		bool hitGround = false;

		float castDistance = 0.0f;

		for (int tries = 0; tries < 250; tries++)
		{
			pos += Vector3.up * 1.0f;

			castDistance += 2.0f;

			Ray ray = new Ray( pos, Vector3.down);
			RaycastHit rch;
			if (Physics.Raycast( ray, out rch, castDistance))
			{
				hitGround = true;

				position = rch.point;

				normal = rch.normal;

				var s = "SpawnUtilities.ProgressiveLiftAndCastDown:hit '" + rch.collider.name + "'";
				s += System.String.Format( ": pos:{0} norm:{1}", position, normal);
				Debug.Log( s);

				break;
			}
		}

		return hitGround;
	}

	public static bool ProgressiveLiftAndCastDown( ref Vector3 position)
	{
		Vector3 normalDummy = Vector3.zero;

		bool hitGround = ProgressiveLiftAndCastDown( ref position, out normalDummy);

		return hitGround;
	}
}