From 2f310aa9f3f1cb1d51e8f62a6d5e3dda4821b82b Mon Sep 17 00:00:00 2001
From: chai <chaifix@163.com>
Date: Wed, 22 Sep 2021 19:25:56 +0800
Subject: *effect

---
 Assets/Scripts/Camera/CameraUtility.cs | 49 ++++++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)
 create mode 100644 Assets/Scripts/Camera/CameraUtility.cs

(limited to 'Assets/Scripts/Camera/CameraUtility.cs')

diff --git a/Assets/Scripts/Camera/CameraUtility.cs b/Assets/Scripts/Camera/CameraUtility.cs
new file mode 100644
index 00000000..1f6c10e6
--- /dev/null
+++ b/Assets/Scripts/Camera/CameraUtility.cs
@@ -0,0 +1,49 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public static class CameraExtend
+{
+
+    public static Vector3 WorldToCameraSpace(this Camera camera, Vector3 worldPos)
+    {
+        Vector4 camPos = camera.worldToCameraMatrix * worldPos.ToVector4();
+        return camPos.ToVector3();
+    }
+
+    public static Vector3 CameraToViewportSpace(this Camera camera, Vector3 camPos)
+    {
+        Matrix4x4 proj = GL.GetGPUProjectionMatrix(camera.projectionMatrix, false);
+        Vector4 clipPos = proj * camPos.ToVector4();
+        Vector3 ndcPos = (clipPos / clipPos.w);
+        Vector3 viewPos = (ndcPos + Vector3.one) / 2f;
+        return viewPos;
+    }
+
+    public static Vector3 CameraToScreenSpace(this Camera camera, Vector3 camPos)
+    {
+        Vector3 viewPos = camera.CameraToViewportSpace(camPos);
+        Vector3 screenPos = new Vector3(
+            viewPos.x * camera.pixelWidth,
+            viewPos.y * camera.pixelHeight,
+            viewPos.z
+        );
+        return screenPos;
+    }
+
+}
+
+public class CameraUtility : MonoBehaviour
+{
+    // Start is called before the first frame update
+    void Start()
+    {
+        
+    }
+
+    // Update is called once per frame
+    void Update()
+    {
+        
+    }
+}
-- 
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