From d11b84222f0c6e1abb7261467eb1aeaf062037a6 Mon Sep 17 00:00:00 2001
From: hyzboy <hyzboy@gmail.com>
Date: Wed, 17 Jul 2024 23:56:10 +0800
Subject: [PATCH] Added IdentityLocalMatrix in SceneOrient

---
 inc/hgl/graph/SceneOrient.h    | 4 ++++
 src/SceneGraph/SceneOrient.cpp | 9 ++++++++-
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/inc/hgl/graph/SceneOrient.h b/inc/hgl/graph/SceneOrient.h
index c7ee1379..e80f2471 100644
--- a/inc/hgl/graph/SceneOrient.h
+++ b/inc/hgl/graph/SceneOrient.h
@@ -21,6 +21,8 @@ namespace hgl
             Vector3f Position;                                                                                          ///<坐标
             Vector3f Direction;                                                                                         ///<方向
 
+            bool IdentityLocalMatrix;                                                                                   ///<是否为空矩阵
+
             Matrix4f LocalMatrix;                                                                                       ///<当前矩阵(指相对上一级的变换矩阵)
             Matrix4f LocalToWorldMatrix;                                                                                ///<当前到世界矩阵
 
@@ -43,6 +45,8 @@ namespace hgl
 
         public: 
 
+            const   bool        IsIdentityLocalMatrix       ()const{return IdentityLocalMatrix;}                        ///<是否为空矩阵(相对上一级没变化)
+
                     Matrix4f &  SetLocalMatrix              (const Matrix4f &);                                         ///<设定当前节点矩阵
                     Matrix4f &  SetLocalToWorldMatrix       (const Matrix4f &);                                         ///<设定当前节点到世界矩阵
 
diff --git a/src/SceneGraph/SceneOrient.cpp b/src/SceneGraph/SceneOrient.cpp
index f5b0ad12..fffbd187 100644
--- a/src/SceneGraph/SceneOrient.cpp
+++ b/src/SceneGraph/SceneOrient.cpp
@@ -8,6 +8,8 @@ namespace hgl
             Position=Vector3f(0.0f);
             Direction=Vector3f(0.0f);
 
+            IdentityLocalMatrix=true;
+
             LocalMatrix                 =Identity4f;
             LocalToWorldMatrix          =Identity4f;
             InverseLocalMatrix          =Identity4f;
@@ -26,6 +28,8 @@ namespace hgl
         {
             LocalMatrix=m;
 
+            IdentityLocalMatrix=IsIdentity(m);
+
             InverseLocalMatrix=inverse(LocalMatrix);
 
             return LocalMatrix;
@@ -46,7 +50,10 @@ namespace hgl
          */
         void SceneOrient::RefreshLocalToWorldMatrix(const Matrix4f *m)
         {
-            SetLocalToWorldMatrix(TransformMatrix(*m,LocalMatrix));
+            if(IdentityLocalMatrix)
+                SetLocalToWorldMatrix(*m);
+            else
+                SetLocalToWorldMatrix(TransformMatrix(*m,LocalMatrix));
         }
     }//namespace graph
 }//namespace hgl