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  • 关于计算透视投影的四条边的方法,留作备忘

    由于项目需要,要计算出透视模式摄像机的四条外边。简直就是做数学题啊,尼玛,不过还好,最终是写出来了!

    using UnityEngine;
    using System.Collections;
    
    public class ClassA : MonoBehaviour
    {
    
        public float distance;
    	// Use this for initialization
    	void Start () {
    	
    	}
    	
    	// Update is called once per frame
    	void Update () {
    	
    	}
        void OnDrawGizmos()
        {
            DrawVectors();
        }
        public void DrawVectors()
        {
            var cameraMain = Camera.main;
            var cameraMainTran = cameraMain.transform;
            var forward = cameraMain.transform.forward;
            var angleVerticalTan = Mathf.Tan(Camera.main.fieldOfView/2*Mathf.Deg2Rad);
            var angleHorizontalTan = angleVerticalTan*cameraMain.aspect;
            var halfVerticalVector = cameraMainTran.up * angleVerticalTan;
            var halfHorizontalVector = cameraMainTran.right * angleHorizontalTan;
            var vec1 = forward + halfVerticalVector + haleHorizontalVector;
            var vec2 = forward + halfVerticalVector - haleHorizontalVector;
            var vec3 = forward - halfVerticalVector - halfHorizontalVector;
            var vec4 = forward - halfVerticalVector + halfHorizontalVector;
            Gizmos.color = Color.red;
            Gizmos.DrawLine(cameraMainTran.position, cameraMainTran.position + vec1 * 1500);
            Gizmos.color = Color.blue;
            Gizmos.DrawLine(cameraMainTran.position, (cameraMainTran.position + vec2 * 1500));
            Gizmos.color = Color.yellow;
            Gizmos.DrawLine(cameraMainTran.position, cameraMainTran.position + vec3 * 1500);
            Gizmos.color = Color.green;
            Gizmos.DrawLine(cameraMainTran.position, cameraMainTran.position + vec4 * 1500);
        }
    } 
    

      最终效果是这样的

    时间匆忙,注释后续再补!

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  • 原文地址:https://www.cnblogs.com/webjs/p/4546382.html
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