//출처 : https://forum.unity.com/threads/drawfrustum-is-drawing-incorrectly.208081/
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class CameraFrustumDrawer : MonoBehaviour
{
[SerializeField] private Camera cam;
private void OnDrawGizmos()
{
DrawFrustum(cam);
}
private void DrawFrustum(Camera _cam)
{
if (null == _cam)
{
return;
}
Vector3[] nearCorners = new Vector3[4]; //Approx'd nearplane corners
Vector3[] farCorners = new Vector3[4]; //Approx'd farplane corners
Plane[] camPlanes = GeometryUtility.CalculateFrustumPlanes(_cam); //get planes from matrix
Plane temp = camPlanes[1]; camPlanes[1] = camPlanes[2]; camPlanes[2] = temp; //swap [1] and [2] so the order is better for the loop
for (int i = 0; i < 4; i++)
{
nearCorners[i] = Plane3Intersect(camPlanes[4], camPlanes[i], camPlanes[(i + 1) % 4]); //near corners on the created projection matrix
farCorners[i] = Plane3Intersect(camPlanes[5], camPlanes[i], camPlanes[(i + 1) % 4]); //far corners on the created projection matrix
}
for (int i = 0; i < 4; i++)
{
Debug.DrawLine(nearCorners[i], nearCorners[(i + 1) % 4], Color.red, Time.deltaTime, true); //near corners on the created projection matrix
Debug.DrawLine(farCorners[i], farCorners[(i + 1) % 4], Color.blue, Time.deltaTime, true); //far corners on the created projection matrix
Debug.DrawLine(nearCorners[i], farCorners[i], Color.green, Time.deltaTime, true); //sides of the created projection matrix
}
}
Vector3 Plane3Intersect(Plane p1, Plane p2, Plane p3)
{
//get the intersection point of 3 planes
return ((-p1.distance * Vector3.Cross(p2.normal, p3.normal)) +
(-p2.distance * Vector3.Cross(p3.normal, p1.normal)) +
(-p3.distance * Vector3.Cross(p1.normal, p2.normal))) /
(Vector3.Dot(p1.normal, Vector3.Cross(p2.normal, p3.normal)));
}
}
출처: https://forum.unity.com/threads/drawfrustum-is-drawing-incorrectly.208081/
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