diff --git a/inc/hgl/math/Matrix.h b/inc/hgl/math/Matrix.h
index 4e30684..4697539 100644
--- a/inc/hgl/math/Matrix.h
+++ b/inc/hgl/math/Matrix.h
@@ -74,7 +74,7 @@ namespace hgl
      * @param target 目标位置
      * @param up 向上向量
      */
-    Matrix4f lookat(const Vector4f &eye,const Vector4f &target,const Vector4f &up);
+    Matrix4f lookat(const Vector3f &eye,const Vector3f &target,const Vector3f &up);
 
     inline Matrix4f translate(const Vector3f &v)
     {
diff --git a/src/Math/Matrix4f.cpp b/src/Math/Matrix4f.cpp
index 073a76a..d5aca47 100644
--- a/src/Math/Matrix4f.cpp
+++ b/src/Math/Matrix4f.cpp
@@ -103,12 +103,12 @@ namespace hgl
         );
     }
 
-    Matrix4f lookat(const Vector4f &eye,const Vector4f &target,const Vector4f &up)
+    Matrix4f lookat(const Vector3f &eye,const Vector3f &target,const Vector3f &up)
     {
-        Vector4f forward=normalize(target-eye);
-        Vector4f right=normalize(cross(forward,up));
+        Vector3f forward=normalize(target-eye);
+        Vector3f right=normalize(cross(forward,up));
 
-        Vector4f nup=cross(right,forward);
+        Vector3f nup=cross(right,forward);
 
         return Matrix4f(   right.x,
                              nup.x,