106 lines
3.8 KiB
C#
106 lines
3.8 KiB
C#
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namespace UnityEngine.Rendering.Universal
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{
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public class DebugCascadeShadow : MonoBehaviour
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{
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public Camera targetCamera;
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public bool showCullingSpheres = true;
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public bool showCameraFrustums = true;
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public Color[] cascadeColors = new Color[]
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{
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new Color(1, 0, 0, 0.5f), // 红
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new Color(0, 1, 0, 0.5f), // 绿
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new Color(0, 0.5f, 1, 0.5f), // 蓝
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new Color(1, 1, 0, 0.5f) // 黄
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};
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public static Vector3 cascadeSplits;
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public static Vector4[] cullingSpheres= new Vector4[4];
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void OnDrawGizmos()
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{
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if (targetCamera == null) return;
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// 可视化Culling Spheres
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if (showCullingSpheres)
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{
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for (int i = 0; i < cullingSpheres.Length; i++)
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{
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if (cullingSpheres[i].w <= 0) continue;
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Gizmos.color = cascadeColors[i % cascadeColors.Length];
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Vector3 sphereCenter = cullingSpheres[i];
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float sphereRadius = cullingSpheres[i].w;
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Gizmos.DrawWireSphere(sphereCenter, sphereRadius);
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}
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}
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// 可视化相机视锥体级联
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if (showCameraFrustums)
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{
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float lastSplit = targetCamera.nearClipPlane;
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for (int i = 0; i < 3; i++)
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{
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if (cascadeSplits[i] <= 0) break;
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Gizmos.color = cascadeColors[i % cascadeColors.Length];
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DrawCascadeFrustum(targetCamera, lastSplit, cascadeSplits[i]);
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lastSplit = cascadeSplits[i];
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}
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}
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}
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private void DrawCascadeFrustum(Camera cam, float startDist, float endDist)
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{
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// 计算视锥体角点
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Vector3[] nearCorners = GetFrustumCorners(cam, startDist);
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Vector3[] farCorners = GetFrustumCorners(cam, endDist);
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// 绘制视锥体线框
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Gizmos.DrawLine(nearCorners[0], farCorners[0]);
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Gizmos.DrawLine(nearCorners[1], farCorners[1]);
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Gizmos.DrawLine(nearCorners[2], farCorners[2]);
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Gizmos.DrawLine(nearCorners[3], farCorners[3]);
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// 绘制近/远平面
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DrawFrustumPlane(nearCorners);
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DrawFrustumPlane(farCorners);
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}
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private Vector3[] GetFrustumCorners(Camera cam, float distance)
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{
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Vector3[] corners = new Vector3[4];
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Transform camTransform = cam.transform;
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float halfFOV = cam.fieldOfView * 0.5f * Mathf.Deg2Rad;
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float aspect = cam.aspect;
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float height = distance * Mathf.Tan(halfFOV);
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float width = height * aspect;
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// 计算相对于相机的角点
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corners[0] = camTransform.forward * distance + camTransform.up * height - camTransform.right * width; // 左下
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corners[1] = camTransform.forward * distance + camTransform.up * height + camTransform.right * width; // 右下
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corners[2] = camTransform.forward * distance - camTransform.up * height + camTransform.right * width; // 右上
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corners[3] = camTransform.forward * distance - camTransform.up * height - camTransform.right * width; // 左上
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// 转换到世界坐标
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for (int i = 0; i < 4; i++)
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{
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corners[i] = camTransform.position + corners[i];
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}
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return corners;
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}
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private void DrawFrustumPlane(Vector3[] corners)
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{
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Gizmos.DrawLine(corners[0], corners[1]);
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Gizmos.DrawLine(corners[1], corners[2]);
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Gizmos.DrawLine(corners[2], corners[3]);
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Gizmos.DrawLine(corners[3], corners[0]);
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}
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}
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}
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