*effect

1 files changed, 27 insertions, 0 deletions

diff --git a/Assets/Scripts/Rendering/RenderingUtility.cs b/Assets/Scripts/Rendering/RenderingUtility.cs
index 297a9b79..90ef84fd 100644
--- a/Assets/Scripts/Rendering/RenderingUtility.cs
+++ b/Assets/Scripts/Rendering/RenderingUtility.cs
@@ -63,4 +63,31 @@ public static class RenderingUtility
     {

         return renderingEventToCameraEventDic[e];

     }
+
+    /// <summary>

+    /// 计算在rt里面的区域

+    /// </summary>

+    /// <param name="camera">相机</param>

+    /// <param name="worldPos">世界空间坐标</param>

+    /// <param name="size">异体矩形(billboard)的相机空间大小</param>

+    /// <returns></returns>
+    public static Vector4 GetTillingOffset(Camera camera, Vector3 worldPos, float size)

+    {

+        Vector4 tileOffset = new Vector4(1,1,0,0);

+        Vector3 camPos = camera.WorldToCameraSpace(worldPos);

+

+        Vector3 bottomLeft = new Vector3(camPos.x - size / 2, camPos.y - size / 2, camPos.z);

+        Vector3 topRight = new Vector3(camPos.x + size / 2, camPos.y + size / 2, camPos.z);

+        Vector2 blViewPos = camera.CameraToViewportSpace(bottomLeft);

+        Vector2 trViewPos = camera.CameraToViewportSpace(topRight);

+        float width = trViewPos.x - blViewPos.x;

+        float height = trViewPos.y - blViewPos.y;

+

+        tileOffset.x = width;

+        tileOffset.y = height;

+        tileOffset.z = blViewPos.x;

+        tileOffset.w = blViewPos.y;

+        return tileOffset;

+    }
+
 }