diff --git a/ui/zenoedit/viewport/cameracontrol.cpp b/ui/zenoedit/viewport/cameracontrol.cpp
index 5a84adf49a..149c3810c7 100644
--- a/ui/zenoedit/viewport/cameracontrol.cpp
+++ b/ui/zenoedit/viewport/cameracontrol.cpp
@@ -586,7 +586,18 @@ void CameraControl::fakeMouseReleaseEvent(QMouseEvent *event) {
                 int y0 = m_boundRectStartPos.y();
                 int x1 = releasePos.x();
                 int y1 = releasePos.y();
-                m_picker->pick(x0, y0, x1, y1);
+                zeno::SELECTION_MODE mode = zeno::SELECTION_MODE::NORMAL;
+                if (shift_pressed == false && ctrl_pressed == false) {
+                    mode = zeno::SELECTION_MODE::NORMAL;
+                }
+                else if (shift_pressed == true && ctrl_pressed == false) {
+                    mode = zeno::SELECTION_MODE::APPEND;
+                }
+                else if (shift_pressed == false && ctrl_pressed == true) {
+                    mode = zeno::SELECTION_MODE::REMOVE;
+                }
+
+                m_picker->pick(x0, y0, x1, y1, mode);
                 m_picker->sync_to_scene();
                 if (scene->select_mode == zenovis::PICK_MODE::PICK_OBJECT)
                     onPrimSelected();
@@ -637,6 +648,12 @@ void CameraControl::fakeMouseReleaseEvent(QMouseEvent *event) {
 }
 
 bool CameraControl::fakeKeyPressEvent(int uKey) {
+    if (uKey & Qt::SHIFT) {
+        shift_pressed = true;
+    }
+    if (uKey & Qt::CTRL) {
+        ctrl_pressed = true;
+    }
     if (!middle_button_pressed) {
         return false;
     }
@@ -684,6 +701,15 @@ bool CameraControl::fakeKeyPressEvent(int uKey) {
     }
 }
 
+bool CameraControl::fakeKeyReleaseEvent(int uKey) {
+    if (uKey == Qt::Key_Shift) {
+        shift_pressed = false;
+    }
+    if (uKey == Qt::Key_Control) {
+        ctrl_pressed = false;
+    }
+    return false;
+}
 //void CameraControl::createPointNode(QPointF pnt) {
 //auto pModel = zenoApp->graphsManagment()->currentModel();
 //ZASSERT_EXIT(pModel);
diff --git a/ui/zenoedit/viewport/cameracontrol.h b/ui/zenoedit/viewport/cameracontrol.h
index db3f10b544..da7798a816 100644
--- a/ui/zenoedit/viewport/cameracontrol.h
+++ b/ui/zenoedit/viewport/cameracontrol.h
@@ -39,6 +39,7 @@ class CameraControl : public QObject
     void setKeyFrame();
 
     bool fakeKeyPressEvent(int uKey);
+    bool fakeKeyReleaseEvent(int uKey);
     void fakeMousePressEvent(QMouseEvent* event);
     void fakeMouseReleaseEvent(QMouseEvent* event);
     void fakeMouseMoveEvent(QMouseEvent* event);
@@ -66,6 +67,8 @@ class CameraControl : public QObject
     Zenovis* m_zenovis;
 
     bool middle_button_pressed = false;
+    bool shift_pressed = false;
+    bool ctrl_pressed = false;
 };
 
 
diff --git a/ui/zenoedit/viewport/displaywidget.cpp b/ui/zenoedit/viewport/displaywidget.cpp
index 6bdac8b03b..8c59fbbbcd 100644
--- a/ui/zenoedit/viewport/displaywidget.cpp
+++ b/ui/zenoedit/viewport/displaywidget.cpp
@@ -1217,7 +1217,7 @@ void DisplayWidget::onNodeSelected(const QModelIndex &subgIdx, const QModelIndex
                         node_context += prim_name + ":" + e.toStdString() + " ";
 
                 if (picker)
-                    picker->load_from_str(node_context, scene->select_mode);
+                    picker->load_from_str(node_context, scene->select_mode, zeno::SELECTION_MODE::NORMAL);
             }
             if (picker) {
                 picker->sync_to_scene();
diff --git a/ui/zenoedit/viewport/viewportwidget.cpp b/ui/zenoedit/viewport/viewportwidget.cpp
index 3aa0670736..ba4c758fb7 100644
--- a/ui/zenoedit/viewport/viewportwidget.cpp
+++ b/ui/zenoedit/viewport/viewportwidget.cpp
@@ -396,4 +396,9 @@ void ViewportWidget::keyPressEvent(QKeyEvent *event)
 
 void ViewportWidget::keyReleaseEvent(QKeyEvent *event) {
     _base::keyReleaseEvent(event);
+    int uKey = event->key();
+    if (m_camera->fakeKeyReleaseEvent(uKey)) {
+        zenoApp->getMainWindow()->updateViewport();
+        return;
+    }
 }
diff --git a/ui/zenoedit/viewportinteraction/picker.cpp b/ui/zenoedit/viewportinteraction/picker.cpp
index 481ec91965..2f9714d141 100644
--- a/ui/zenoedit/viewportinteraction/picker.cpp
+++ b/ui/zenoedit/viewportinteraction/picker.cpp
@@ -145,7 +145,7 @@ void Picker::pick(int x, int y) {
     // onPrimitiveSelected();
 }
 
-void Picker::pick(int x0, int y0, int x1, int y1) {
+void Picker::pick(int x0, int y0, int x1, int y1, SELECTION_MODE mode) {
     auto scene = this->scene();
     ZASSERT_EXIT(scene);
     auto selected = picker->getPicked(x0, y0, x1, y1);
@@ -155,14 +155,10 @@ void Picker::pick(int x0, int y0, int x1, int y1) {
             selected_prims.clear();
             return;
         }
-        load_from_str(selected, zenovis::PICK_MODE::PICK_OBJECT);
+        load_from_str(selected, zenovis::PICK_MODE::PICK_OBJECT, SELECTION_MODE::NORMAL);
     }
     else {
-        if (selected.empty()) {
-            selected_elements.clear();
-            return;
-        }
-        load_from_str(selected, scene->select_mode);
+        load_from_str(selected, scene->select_mode, mode);
         if (picked_elems_callback) picked_elems_callback(selected_elements);
     }
 }
@@ -201,7 +197,7 @@ void Picker::sync_to_scene() {
 
 }
 
-void Picker::load_from_str(const string& str, zenovis::PICK_MODE mode) {
+void Picker::load_from_str(const string& str, zenovis::PICK_MODE mode, SELECTION_MODE sel_mode) {
     if (str.empty()) return;
     // parse selected string
     std::regex reg(" ");
@@ -215,6 +211,9 @@ void Picker::load_from_str(const string& str, zenovis::PICK_MODE mode) {
         }
     }
     else {
+        if (sel_mode == SELECTION_MODE::NORMAL) {
+            selected_elements.clear();
+        }
         while (p != end) {
             string result = *p++;
             // qDebug() << result.c_str();
@@ -225,7 +224,7 @@ void Picker::load_from_str(const string& str, zenovis::PICK_MODE mode) {
             int elem_id; ss >> elem_id;
             if (selected_elements.find(obj_id) != selected_elements.end()) {
                 auto &elements = selected_elements[obj_id];
-                if (elements.count(elem_id) > 0)
+                if (sel_mode == SELECTION_MODE::REMOVE)
                     elements.erase(elem_id);
                 else
                     elements.insert(elem_id);
diff --git a/ui/zenoedit/viewportinteraction/picker.h b/ui/zenoedit/viewportinteraction/picker.h
index ca60719185..3cf7bd4d26 100644
--- a/ui/zenoedit/viewportinteraction/picker.h
+++ b/ui/zenoedit/viewportinteraction/picker.h
@@ -16,6 +16,12 @@ class ViewportWidget;
 
 namespace zeno {
 
+enum class SELECTION_MODE {
+    NORMAL,
+    APPEND,
+    REMOVE,
+};
+
 std::optional<float> ray_box_intersect(
     zeno::vec3f const &bmin,
     zeno::vec3f const &bmax,
@@ -38,14 +44,14 @@ class Picker
     Picker(ViewportWidget* pViewport);
     void initialize();
     void pick(int x, int y);
-    void pick(int x0, int y0, int x1, int y1);
+    void pick(int x0, int y0, int x1, int y1, SELECTION_MODE mode = SELECTION_MODE::NORMAL);
     void pick_depth(int x, int y);
     void add(const std::string& prim_name);
     std::string just_pick_prim(int x, int y);
     const std::unordered_set<std::string>& get_picked_prims();
     const std::unordered_map<std::string, std::unordered_set<int>>& get_picked_elems();
     void sync_to_scene();
-    void load_from_str(const std::string& str, zenovis::PICK_MODE mode);
+    void load_from_str(const std::string& str, zenovis::PICK_MODE mode, SELECTION_MODE sel_mode);
     std::string save_to_str(zenovis::PICK_MODE mode);
     void save_context();
     void load_context();