CameraClearFlags.Depth

Clear only the depth buffer.

This will leave colors from the previous frame or whatever was displayed before. See Also: Camera.clearFlags property, camera component.

JavaScripts

// Clear only the depth buffer

camera.clearFlags = CameraClearFlags.Depth;

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
void Awake() {
camera.clearFlags = CameraClearFlags.Depth;
}
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

def Awake():
camera.clearFlags = CameraClearFlags.Depth