Transform.InverseTransformPoint 反向变换点

Unity变换坐标详解

最新推荐文章于 2023-02-04 19:39:36 发布

转载最新推荐文章于 2023-02-04 19:39:36 发布 · 365 阅读

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原文链接：http://www.cnblogs.com/mimime/p/6237039.html

文章标签：

#javascript #c# #ViewUI

本文详细解释了Unity中Transform.InverseTransformPoint和Transform.TransformPoint的方法，包括如何将位置从世界坐标转换为局部坐标，以及相反的操作。并通过具体示例展示了如何判断物体相对于摄像机的位置。

JavaScript ⇒ public function InverseTransformPoint(position: Vector3): Vector3;
C# ⇒public Vector3 InverseTransformPoint(Vector3 position);

Description 描述

Transforms position from world space to local space. The opposite of Transform.TransformPoint.

变换位置从世界坐标到局部坐标。和Transform.TransformPoint相反。

Note that the returned position is affected by scale. Use Transform.InverseTransformDirection if you are dealing with directions.

注意，返回位置受缩放影响。如果你是处理方向使用Transform.InverseTransformDirection。

JavaScript:

// Calculate the transform's position relative to the camera.
 
var cam = Camera.main.transform; var cameraRelative = cam.InverseTransformPoint(transform.position); if (cameraRelative.z > 0) print ("The object is in front of the camera"); else print ("The object is behind the camera");

C#:

using UnityEngine;
using System.Collections;   public class ExampleClass : MonoBehaviour { public Transform cam = Camera.main.transform; public Vector3 cameraRelative = cam.InverseTransformPoint(transform.position); void Example() { if (cameraRelative.z > 0) print("The object is in front of the camera"); else print("The object is behind the camera"); } }

JavaScript ⇒public function InverseTransformPoint(x: float, y: float, z: float): Vector3;
C# ⇒public Vector3 InverseTransformPoint(float x, float y, float z);

Description 描述

Transforms the position x, y, z from world space to local space. The opposite of Transform.TransformPoint.

变换位置 x, y, z从世界坐标到局部坐标。和Transform.TransformPoint相反。

Note that the returned position is affected by scale. Use Transform.InverseTransformDirection if you are dealing with directions.

注意，返回位置受缩放影响。如果你是处理方向使用Transform.InverseTransformDirection。

JavaScript:

// Calculate the world origin relative to this transform.
 
relativePoint = transform.InverseTransformPoint(0, 0, 0); if (relativePoint.z > 0) print ("The world origin is in front of this object"); else print ("The world origin is behind of this object");

C#:

using UnityEngine;
using System.Collections;   public class ExampleClass : MonoBehaviour { void Example() { relativePoint = transform.InverseTransformPoint(0, 0, 0); if (relativePoint.z > 0) print("The world origin is in front of this object"); else print("The world origin is behind of this object"); } }

☚ Transform

transform.InverseTransformPoint 和 transform.TransformPoint 是怎么回事

一个是变换自身坐标到世界坐标一个是变换世界坐标到自身坐标

比如说物体a的坐标内有一个3,3,3的点你想知道这个点在世界坐标的位置就应该用TransformPoint

反之在世界坐标下有一个点你想知道这个点如果是在物体a的坐标下是一个什么位置就应该用InverseTransformPoint

其实吧就是在编辑器里把物体拽到根目录下的位置和物体在某物体内的位置之间的一个转换

转载于:https://www.cnblogs.com/mimime/p/6237039.html