diff --git a/src/canvas.cpp b/src/canvas.cpp
index a7712b0..cf249b6 100644
--- a/src/canvas.cpp
+++ b/src/canvas.cpp
@@ -2202,6 +2202,50 @@ Image Canvas::thumbnail_read(std::string file_path)
     return thumb;
 }
 
+void Canvas::draw_objects_direct(std::function<void(const glm::mat4& camera, const glm::mat4& proj, int i)> observer, Layer& layer)
+{
+    // save viewport and clear color states
+    GLint vp[4];
+    GLfloat cc[4];
+    glGetIntegerv(GL_VIEWPORT, vp);
+    glGetFloatv(GL_COLOR_CLEAR_VALUE, cc);
+    GLboolean blend = glIsEnabled(GL_BLEND);
+
+    // prepare common states
+    glViewport(0, 0, layer.w, layer.h);
+    glDisable(GL_BLEND);
+
+    GLuint rboID;
+    glGenRenderbuffers(1, &rboID);
+    glBindRenderbuffer(GL_RENDERBUFFER, rboID);
+    glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT24, layer.w, layer.h);
+    glBindRenderbuffer(GL_RENDERBUFFER, 0);
+
+    glm::mat4 proj = glm::perspective(glm::radians(90.f), 1.f, .01f, 1000.f);
+    for (int i = 0; i < 6; i++)
+    {
+        glm::mat4 plane_camera = glm::lookAt(glm::vec3(0), m_plane_origin[i], m_plane_tangent[i]);
+        layer.m_rtt[i].bindFramebuffer();
+        glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, rboID);
+
+        observer(plane_camera, proj, i);
+
+        glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, 0);
+        layer.m_rtt[i].unbindFramebuffer();
+
+        layer.m_dirty_face[i] = true;
+        layer.m_dirty_box[i] = { 0, 0, layer.w, layer.h };
+    }
+
+    glDeleteRenderbuffers(1, &rboID);
+
+    // restore viewport and clear color states
+    blend ? glEnable(GL_BLEND) : glDisable(GL_BLEND);
+    glViewport(vp[0], vp[1], vp[2], vp[3]);
+    glClearColor(cc[0], cc[1], cc[2], cc[3]);
+    glActiveTexture(GL_TEXTURE0);
+}
+
 void Canvas::draw_objects(std::function<void(const glm::mat4& camera, const glm::mat4& proj, int i)> observer, Layer& layer)
 {
     // save viewport and clear color states
diff --git a/src/canvas.h b/src/canvas.h
index f0a46ac..a3083dc 100644
--- a/src/canvas.h
+++ b/src/canvas.h
@@ -254,6 +254,7 @@ public:
     Image thumbnail_read(std::string file_path);
     void draw_objects(std::function<void(const glm::mat4& camera, const glm::mat4& proj, int i)>);
     void draw_objects(std::function<void(const glm::mat4& camera, const glm::mat4& proj, int i)>, Layer& layer);
+    void draw_objects_direct(std::function<void(const glm::mat4& camera, const glm::mat4& proj, int i)>, Layer& layer);
     void point_unproject(glm::vec2 loc, glm::vec4 vp, glm::mat4 camera, glm::mat4 proj,
                          glm::vec3 &out_origin, glm::vec3 &out_dir);
     void point_unproject(glm::vec2 loc, glm::vec3 &out_origin, glm::vec3 &out_dir);
diff --git a/src/canvas_modes.cpp b/src/canvas_modes.cpp
index 555e74c..bc4561f 100644
--- a/src/canvas_modes.cpp
+++ b/src/canvas_modes.cpp
@@ -510,6 +510,7 @@ void CanvasModeMaskFree::on_MouseEvent(MouseEvent* me, glm::vec2& loc)
                 //m_points2d = poly_intersect(poly_remove_duplicate(m_points2d), canvas->face_to_shape2D(0));
                 auto drawer = [this](const glm::mat4& camera, const glm::mat4& proj) {
                     //glEnable(GL_BLEND);
+                    glDisable(GL_DEPTH_TEST);
                     ShaderManager::use(kShader::Color);
                     ShaderManager::u_mat4(kShaderUniform::MVP, proj * camera);
                     ShaderManager::u_vec4(kShaderUniform::Col, {1, 1, 1, 1});
@@ -519,7 +520,7 @@ void CanvasModeMaskFree::on_MouseEvent(MouseEvent* me, glm::vec2& loc)
                 auto v = canvas->triangulate(poly_remove_duplicate(m_points2d));
                 canvas->project2Dpoints(v);
                 m_shape.update_vertices(v.data(), (int)v.size());
-                canvas->draw_objects(std::bind(drawer, std::placeholders::_1, std::placeholders::_2), canvas->m_smask);
+                canvas->draw_objects_direct(std::bind(drawer, std::placeholders::_1, std::placeholders::_2), canvas->m_smask);
                 
                 // close the path and reset m_shape to contour rendering
                 m_points.push_back(m_points.back());
@@ -639,7 +640,7 @@ void CanvasModeMaskLine::leave()
                 ShaderManager::u_vec4(kShaderUniform::Col, {1, 1, 1, 1});
                 m_shape.draw_fill();
             };
-            canvas->draw_objects(std::bind(drawer, std::placeholders::_1, std::placeholders::_2), canvas->m_smask);
+            canvas->draw_objects_direct(std::bind(drawer, std::placeholders::_1, std::placeholders::_2), canvas->m_smask);
             
             //m_points.clear();
             // close the path
@@ -763,7 +764,7 @@ void CanvasModeFill::leave()
             ShaderManager::u_vec4(kShaderUniform::Col, {1, 1, 1, 1});
             m_shape.draw_fill();
         };
-        canvas->draw_objects(std::bind(drawer, std::placeholders::_1, std::placeholders::_2), canvas->m_smask);
+        canvas->draw_objects_direct(std::bind(drawer, std::placeholders::_1, std::placeholders::_2), canvas->m_smask);
         m_points.clear();
         canvas->m_smask_active = true;
     }