using UnityEngine;
using System.IO;
 
/// 

/// 相机截图
/// ZhangYu 2018-07-06
/// 
public class CameraCapture : MonoBehaviour {
 
 // 截图尺寸
 public enum CaptureSize {
 CameraSize,
 ScreenResolution,
 FixedSize
 }
 
 // 目标摄像机
 public Camera targetCamera;
 // 截图尺寸
 public CaptureSize captureSize = CaptureSize.CameraSize;
 // 像素尺寸
 public Vector2 pixelSize;
 // 保存路径
 public string savePath = "StreamingAssets/";
 // 文件名称
 public string fileName = "cameraCapture.png";
 
 #if UNITY_EDITOR
 private void Reset() {
 targetCamera = GetComponent();
 pixelSize = new Vector2(Screen.currentResolution.width, Screen.currentResolution.height);
 }
 #endif
 
 /// 
 保存截图 
 /// 目标摄像机
 public void saveCapture() {
 Vector2 size = pixelSize;
 if (captureSize == CaptureSize.CameraSize) {
  size = new Vector2(targetCamera.pixelWidth, targetCamera.pixelHeight);
 } else if (captureSize == CaptureSize.ScreenResolution) {
  size = new Vector2(Screen.currentResolution.width, Screen.currentResolution.height);
 }
 string path = Application.dataPath + "/" + savePath + fileName;
 saveTexture(path, capture(targetCamera, (int)size.x, (int)size.y));
 }
 
 /// 
 相机截图 
 /// 目标相机
 public static Texture2D capture(Camera camera) {
 return capture(camera, Screen.width, Screen.height);
 }
 
 /// 
 相机截图 
 /// 目标相机
 /// 宽度
 /// 高度
 public static Texture2D capture(Camera camera, int width, int height) {
 RenderTexture rt = new RenderTexture(width, height, 0);
 rt.depth = 24;
 rt.antiAliasing = 8;
 camera.targetTexture = rt;
 camera.RenderDontRestore();
 RenderTexture.active = rt;
 Texture2D texture = new Texture2D(width, height, TextureFormat.ARGB32, false, true);
 Rect rect = new Rect(0, 0, width, height);
 texture.ReadPixels(rect, 0, 0);
 texture.filterMode = FilterMode.Point;
 texture.Apply();
 camera.targetTexture = null;
 RenderTexture.active = null;
 Destroy(rt);
 return texture;
 }
 
 /// 
 保存贴图 
 /// 保存路径
 /// Texture2D
 public static void saveTexture(string path, Texture2D texture) {
 File.WriteAllBytes(path, texture.EncodeToPNG());
 #if UNITY_EDITOR
 Debug.Log("已保存截图到:" + path);
 #endif
 }
 
}

using UnityEditor;
using UnityEngine;
 
/// 

/// 相机截图 编辑器
/// ZhangYu 2018-07-06
/// 
[CanEditMultipleObjects]
[CustomEditor(typeof(CameraCapture))]
public class CameraCaptureEditor : Editor {
 
 public override void OnInspectorGUI() {
 // 属性
 CameraCapture script = (CameraCapture)target;
 int selected = (int)script.captureSize;
 
 // 重绘GUI
 EditorGUI.BeginChangeCheck();
 drawProperty("targetCamera", "目标像机");
 string[] options = new string[] { "像机尺寸", "屏幕尺寸", "固定尺寸"};
 selected = EditorGUILayout.Popup("截图尺寸", selected, options, GUILayout.ExpandWidth(true));
 script.captureSize = (CameraCapture.CaptureSize)selected;
 if (script.captureSize == CameraCapture.CaptureSize.FixedSize) {
  drawProperty("pixelSize", "像素尺寸");
  EditorGUILayout.HelpBox("请保持正确的宽高比！\n否则截图区域可能出现错误。", MessageType.Info);
 }
 drawProperty("savePath", "保存路径");
 drawProperty("fileName", "文件名称");
 
 // 保存截图按钮
 bool isPress = GUILayout.Button("保存截图", GUILayout.ExpandWidth(true));
 if (isPress) script.saveCapture();
 if (EditorGUI.EndChangeCheck()) serializedObject.ApplyModifiedProperties();
 }
 
 private void drawProperty(string property, string label) {
 EditorGUILayout.PropertyField(serializedObject.FindProperty(property), new GUIContent(label), true);
 }
 
}