diff --git a/src/app.cpp b/src/app.cpp
index b70498e..11692d9 100644
--- a/src/app.cpp
+++ b/src/app.cpp
@@ -365,7 +365,8 @@ void App::init()
     glEnable(GL_LINE_SMOOTH);
 #endif
     glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
-    glBlendEquation(GL_FUNC_ADD);
+    //glBlendEquation(GL_FUNC_ADD);
+    glBlendEquationSeparate(GL_FUNC_ADD, GL_MAX);
 
     initShaders();
     initAssets();
@@ -492,18 +493,38 @@ void App::update(float dt)
         }
         return false;
     };
-    //glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
+    uirtt.bindFramebuffer();
+    uirtt.clear();
+    glEnable(GL_SCISSOR_TEST);
+    for (int i = 1; i < layout[main_id]->m_children.size(); i++)
+        layout[main_id]->m_children[i]->watch(observer);
+    //msgbox->watch(observer);
+    glDisable(GL_SCISSOR_TEST);
+    uirtt.unbindFramebuffer();
+
 #if __IOS__
     [ios_view->glview bindDrawable];
 #else
     glBindFramebuffer(GL_FRAMEBUFFER, 0);
 #endif
+    //canvas->watch(observer);
     glEnable(GL_SCISSOR_TEST);
-    if (auto* main = layout[main_id])
-        main->watch(observer);
+    for (int i = 0; i < layout[main_id]->m_children.size(); i++)
+        layout[main_id]->m_children[i]->watch(observer);
     //msgbox->watch(observer);
     glDisable(GL_SCISSOR_TEST);
-    
+
+//     glEnable(GL_BLEND);
+//     sampler.bind(0);
+//     ui::ShaderManager::use(kShader::Texture);
+//     ui::ShaderManager::u_int(kShaderUniform::Tex, 0);
+//     ui::ShaderManager::u_mat4(kShaderUniform::MVP, glm::ortho(-1.f, 1.f, -1.f, 1.f));
+//     glActiveTexture(GL_TEXTURE0);
+//     uirtt.bindTexture();
+//     m_face_plane.draw_fill();
+//     uirtt.unbindTexture();
+//     glDisable(GL_BLEND);
+
     if (rec_running)
     {
         rec_timer += dt;
diff --git a/src/app.h b/src/app.h
index 03d76fa..96f3da0 100644
--- a/src/app.h
+++ b/src/app.h
@@ -80,6 +80,9 @@ public:
     bool keys[256];
     bool redraw = true;
     bool animate = false;
+    glm::mat4 vr_rot{ 0 };
+    glm::mat4 vr_uirot{ 0 };
+    glm::vec2 cursor{ 0, 0 };
     glm::vec2 gesture_p0;
     glm::vec2 gesture_p1;
 #ifdef __ANDROID__
diff --git a/src/app_events.cpp b/src/app_events.cpp
index 28de739..5580be7 100644
--- a/src/app_events.cpp
+++ b/src/app_events.cpp
@@ -19,6 +19,7 @@ void App::tick(float dt)
 
 void App::resize(float w, float h)
 {
+    uirtt.create(w, h);
     redraw = true;
     width = w;
     height = h;
@@ -181,6 +182,7 @@ bool App::mouse_down(int button, float x, float y, float pressure, kEventSource
 }
 bool App::mouse_move(float x, float y, float pressure, kEventSource source, bool eraser)
 {
+    cursor = { x / zoom, y / zoom };
     redraw = true;
     MouseEvent e;
     e.m_type = kEventType::MouseMove;
@@ -264,6 +266,8 @@ bool App::gesture_end()
 }
 bool App::key_down(kKey key)
 {
+    if (key == kKey::KeySpacebar)
+        canvas->m_canvas->m_cam_rot = vr_rot;
     redraw = true;
     keys[(int)key] = true;
     KeyEvent e;
diff --git a/src/app_vr.cpp b/src/app_vr.cpp
index d5f6a52..20d8682 100644
--- a/src/app_vr.cpp
+++ b/src/app_vr.cpp
@@ -13,6 +13,8 @@ void App::vr_draw(const glm::mat4& proj, const glm::mat4& camera)
     //         auto plane_mvp = proj * camera * transform *
     //             glm::scale(glm::vec3(sz, 1));
 
+    //glm::extractEulerAngleXYZ(camera, vr_rot.y, vr_rot.x, vr_rot.z);
+    vr_rot = camera;
 
     sampler.bind(0);
     sampler.bind(1);
@@ -51,11 +53,67 @@ void App::vr_draw(const glm::mat4& proj, const glm::mat4& camera)
 
             int z = (int)(canvas->m_canvas->m_order.size() - i);
             auto plane_mvp_z = proj * camera * 
-                glm::scale(glm::vec3(z + 1)) * 
+                glm::scale(glm::vec3(z + 1) * 100.f) * 
                 //glm::eulerAngleYXZ(yaw, pitch, roll) *
                 canvas->m_canvas->m_plane_transform[plane_index] *
                 glm::translate(glm::vec3(0, 0, -1));
             
+            if (canvas->m_canvas->m_state == ui::Canvas::kCanvasMode::Erase && canvas->m_canvas->m_show_tmp && canvas->m_canvas->m_current_layer_idx == layer_index)
+            {
+                sampler.bind(0);
+                ui::ShaderManager::use(kShader::CompErase);
+                ui::ShaderManager::u_int(kShaderUniform::Tex, 0);
+                ui::ShaderManager::u_int(kShaderUniform::TexStroke, 1);
+                //ui::ShaderManager::u_int(kShaderUniform::TexMask, 2);
+                ui::ShaderManager::u_float(kShaderUniform::Alpha, canvas->m_canvas->m_current_stroke->m_brush.m_tip_opacity);
+                //ui::ShaderManager::u_int(kShaderUniform::Lock, m_canvas->m_layers[layer_index].m_alpha_locked);
+                //ui::ShaderManager::u_int(kShaderUniform::Mask, m_canvas->m_smask_active);
+                ui::ShaderManager::u_mat4(kShaderUniform::MVP, plane_mvp_z);
+                glActiveTexture(GL_TEXTURE0);
+                canvas->m_canvas->m_layers[layer_index].m_rtt[plane_index].bindTexture();
+                glActiveTexture(GL_TEXTURE1);
+                canvas->m_canvas->m_tmp[plane_index].bindTexture();
+                glActiveTexture(GL_TEXTURE2);
+                canvas->m_canvas->m_smask.m_rtt[plane_index].bindTexture();
+                m_face_plane.draw_fill();
+                canvas->m_canvas->m_smask.m_rtt[plane_index].unbindTexture();
+                glActiveTexture(GL_TEXTURE1);
+                canvas->m_canvas->m_tmp[plane_index].unbindTexture();
+                glActiveTexture(GL_TEXTURE0);
+                canvas->m_canvas->m_layers[layer_index].m_rtt[plane_index].unbindTexture();
+            }
+            else if (canvas->m_canvas->m_show_tmp && canvas->m_canvas->m_current_layer_idx == layer_index)
+            {
+                sampler.bind(0);
+                auto& paper = TextureManager::get(const_hash("data/paper.jpg"));
+                ui::ShaderManager::use(kShader::CompDraw);
+                ui::ShaderManager::u_int(kShaderUniform::Tex, 0);
+                ui::ShaderManager::u_int(kShaderUniform::TexStroke, 1);
+                ui::ShaderManager::u_int(kShaderUniform::TexMask, 2);
+                //ui::ShaderManager::u_int(kShaderUniform::TexStencil, 3);
+                ui::ShaderManager::u_float(kShaderUniform::Alpha, canvas->m_canvas->m_current_stroke->m_brush.m_tip_opacity);
+                ui::ShaderManager::u_int(kShaderUniform::Lock, canvas->m_canvas->m_layers[layer_index].m_alpha_locked);
+                ui::ShaderManager::u_int(kShaderUniform::Mask, canvas->m_canvas->m_smask_active);
+                ui::ShaderManager::u_int(kShaderUniform::BlendMode, canvas->m_canvas->m_current_stroke->m_brush.m_blend_mode);
+                ui::ShaderManager::u_mat4(kShaderUniform::MVP, plane_mvp_z);
+                glActiveTexture(GL_TEXTURE0);
+                canvas->m_canvas->m_layers[layer_index].m_rtt[plane_index].bindTexture();
+                glActiveTexture(GL_TEXTURE1);
+                canvas->m_canvas->m_tmp[plane_index].bindTexture();
+                glActiveTexture(GL_TEXTURE2);
+                canvas->m_canvas->m_smask.m_rtt[plane_index].bindTexture();
+                glActiveTexture(GL_TEXTURE3);
+                paper.bind();
+                m_face_plane.draw_fill();
+                paper.unbind();
+                glActiveTexture(GL_TEXTURE2);
+                canvas->m_canvas->m_smask.m_rtt[plane_index].unbindTexture();
+                glActiveTexture(GL_TEXTURE1);
+                canvas->m_canvas->m_tmp[plane_index].unbindTexture();
+                glActiveTexture(GL_TEXTURE0);
+                canvas->m_canvas->m_layers[layer_index].m_rtt[plane_index].unbindTexture();
+            }
+            else
             {
                 sampler.bind(0);
                 sampler_linear.bind(1);
@@ -81,6 +139,43 @@ void App::vr_draw(const glm::mat4& proj, const glm::mat4& camera)
         }
     }
 
+    float tan_fov = glm::tan(glm::radians(canvas->m_canvas->m_cam_fov / 2.f));
+    glm::vec3 aspect = { (float)uirtt.getWidth() / (float)uirtt.getHeight(), 1.f, 1.f };
+    // draw the 2D UI
+    {
+        auto plane_mvp_z = proj * camera *
+            glm::scale(glm::vec3(100)) *
+            //glm::eulerAngleYXZ(yaw, pitch, roll) *
+            //canvas->m_canvas->m_plane_transform[plane_index] *
+            glm::transpose(canvas->m_canvas->m_cam_rot) *
+            glm::translate(glm::vec3(0, 0, -1)) *
+            glm::scale(aspect * tan_fov);
+        sampler.bind(0);
+        ui::ShaderManager::use(kShader::Texture);
+        ui::ShaderManager::u_int(kShaderUniform::Tex, 0);
+        ui::ShaderManager::u_mat4(kShaderUniform::MVP, plane_mvp_z);
+        glActiveTexture(GL_TEXTURE0);
+        uirtt.bindTexture();
+        m_face_plane.draw_fill();
+        uirtt.unbindTexture();
+    }
+
+    // draw the cursor
+    {
+        auto cur = (glm::vec2(cursor.x / width, 1.f - cursor.y / height) - 0.5f) * 2.f;
+        auto mvp = proj * camera *
+            glm::scale(glm::vec3(100)) *
+            //glm::eulerAngleYXZ(yaw, pitch, roll) *
+            //canvas->m_canvas->m_plane_transform[plane_index] *
+            glm::transpose(canvas->m_canvas->m_cam_rot) *
+            glm::translate(glm::vec3(cur * glm::vec2(aspect * tan_fov), -1)) *
+            glm::scale(glm::vec3(.01));
+        ui::ShaderManager::use(kShader::Color);
+        ui::ShaderManager::u_vec4(kShaderUniform::Col, { 0, 0, 0, 1 });
+        ui::ShaderManager::u_mat4(kShaderUniform::MVP, mvp);
+        m_face_plane.draw_fill();
+    }
+
 /*
     for (auto& mode : *m_canvas->m_mode)
         mode->on_Draw(ortho_proj, proj, camera);
diff --git a/src/brush.cpp b/src/brush.cpp
index 004d6b8..696b6f5 100644
--- a/src/brush.cpp
+++ b/src/brush.cpp
@@ -1,7 +1,6 @@
 #include "pch.h"
 #include "log.h"
 #include "brush.h"
-#include "canvas.h"
 
 void ui::BrushMesh::draw(const std::vector<StrokeSample>& samples, const glm::mat4& proj)
 {
@@ -240,7 +239,7 @@ void ui::Stroke::start(const ui::Brush& brush)
     m_last_kp = 0;
     m_dist = 0.f;
     m_brush = brush;
-    m_brush.m_tip_size *= 1.f / glm::tan(glm::radians(Canvas::I->m_cam_fov * 0.5f));
+    m_brush.m_tip_size *= 1.f / glm::tan(glm::radians(m_camera.fov * 0.5f));
     m_step = glm::max(m_brush.m_tip_spacing * m_brush.m_tip_size * 800.f, 1.f);
     prng.seed(0);
 }
diff --git a/src/brush.h b/src/brush.h
index 36d132b..7fc60cc 100644
--- a/src/brush.h
+++ b/src/brush.h
@@ -82,7 +82,7 @@ public:
     };
     struct Camera
     {
-        glm::vec2 rot = { 0, 0 };
+        glm::mat4 rot;
         float fov = 0;
     };
     int m_layer = 0;
diff --git a/src/canvas.h b/src/canvas.h
index 261f618..7c6f6c7 100644
--- a/src/canvas.h
+++ b/src/canvas.h
@@ -155,7 +155,7 @@ public:
     Sampler m_sampler_mask;
     Sampler m_sampler_stencil;
     Sampler m_sampler_mix;
-    glm::vec2 m_cam_rot{ 0 };
+    glm::mat4 m_cam_rot = glm::mat4(1);
     glm::vec3 m_cam_pos{ 0 };
     float m_cam_fov = 85;
     glm::vec2 m_cur_pos;
diff --git a/src/canvas_modes.cpp b/src/canvas_modes.cpp
index fc0d69b..9e155bd 100644
--- a/src/canvas_modes.cpp
+++ b/src/canvas_modes.cpp
@@ -45,8 +45,11 @@ void CanvasModeBasicCamera::on_MouseEvent(MouseEvent* me, glm::vec2& loc)
             break;
         case kEventType::MouseMove:
             if (m_draggingR)
+            {
                 canvas->m_pan = m_pan_start + (me->m_pos - m_dragR_start) * glm::vec2(-1, -1) * (canvas->m_cam_fov / 85.f);
-            canvas->m_cam_rot = canvas->m_pan * 0.003f;
+                auto angle = canvas->m_pan * 0.003f;
+                canvas->m_cam_rot = glm::eulerAngleXY(angle.y, angle.x);
+            }
             break;
         case kEventType::MouseScroll:
             m_zoom_canvas += me->m_scroll_delta * 0.1f;
@@ -74,7 +77,8 @@ void CanvasModeBasicCamera::on_GestureEvent(GestureEvent* ge)
         case kEventType::GestureMove:
             canvas->m_pan = m_pan_start + ge->m_pos_delta * glm::vec2(-1, -1) * 0.3f * (canvas->m_cam_fov / 85.f);
             canvas->m_cam_fov = m_camera_fov - ge->m_distance_delta * .05f;
-            canvas->m_cam_rot = canvas->m_pan * 0.003f;
+            auto angle = canvas->m_pan * 0.003f;
+            canvas->m_cam_rot = glm::eulerAngleXY(angle.y, angle.x);
             App::I.brush_update();
             break;
         default:
diff --git a/src/hmd.cpp b/src/hmd.cpp
index 4f4af9f..230faf8 100644
--- a/src/hmd.cpp
+++ b/src/hmd.cpp
@@ -103,7 +103,8 @@ void Vive::Draw()
             h.m[0][0], h.m[1][0], h.m[2][0], 0,
             h.m[0][1], h.m[1][1], h.m[2][1], 0,
             h.m[0][2], h.m[1][2], h.m[2][2], 0,
-            h.m[0][3], h.m[1][3], h.m[2][3], 1,
+                    0,         0,         0, 1,
+            //h.m[0][3], h.m[1][3], h.m[2][3], 1,
         };
 
         auto mat_proj = glm::make_mat4((float*)eyeProj);
diff --git a/src/main.cpp b/src/main.cpp
index 7e3570c..f8e8703 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -709,6 +709,9 @@ int main(int argc, char** argv)
     std::condition_variable hmd_render_cv;
 
     std::thread hmd_renderer([&] {
+        if (!vive)
+            return;
+
         BT_SetTerminate();
         LOG("start hmd render thread");
 
diff --git a/src/node_canvas.cpp b/src/node_canvas.cpp
index 4587c3b..c8e7b15 100644
--- a/src/node_canvas.cpp
+++ b/src/node_canvas.cpp
@@ -77,8 +77,7 @@ void NodeCanvas::draw()
 
     glm::mat4 ortho_proj = glm::ortho(0.f, box.z, 0.f, box.w, -1000.f, 1000.f);
     glm::mat4 proj = glm::perspective(glm::radians(m_canvas->m_cam_fov), box.z / box.w, 0.01f, 1000.f);
-    glm::mat4 camera = glm::eulerAngleXY(m_canvas->m_cam_rot.y, m_canvas->m_cam_rot.x) *
-        glm::translate(m_canvas->m_cam_pos);
+    glm::mat4 camera = m_canvas->m_cam_rot * glm::translate(m_canvas->m_cam_pos);
 
     m_canvas->m_mv = camera;
     m_canvas->m_proj = proj;
@@ -450,7 +449,7 @@ kEventResult NodeCanvas::handle_event(Event* e)
 
 void NodeCanvas::reset_camera()
 {
-    m_canvas->m_cam_rot = {0, 0};
+    m_canvas->m_cam_rot = glm::mat4(1);
     m_canvas->m_cam_pos = {0, 0, 0};
     m_canvas->m_cam_fov = 85;
     m_canvas->m_pan = {0, 0};