diff --git a/data/layout.xml b/data/layout.xml
index be43d13..b64c644 100644
--- a/data/layout.xml
+++ b/data/layout.xml
@@ -248,58 +248,49 @@
       </border>
       <border color=".3" pad="5" dir="col" width="100%">
         
-        <border color=".2" height="20" justify="center" align="center"><text text="Ground" font-face="arial" font-size="11"/></border>
         <node dir="row">
-          <node width="30%" dir="col">
+          <node width="40%" dir="col">
             <node height="20" justify="center"><text text="Opacity" font-face="arial" font-size="11"/></node>
-            <node height="20" justify="center"><text text="Scale" font-face="arial" font-size="11"/></node>
             <node height="20" justify="center"><text text="Value" font-face="arial" font-size="11"/></node>
-            <node height="20" justify="center"><text text="Height" font-face="arial" font-size="11"/></node>
+            <node height="20" justify="center"><text text="Resolution" font-face="arial" font-size="11"/></node>
+            <node height="20" justify="center"><text text="Offset" font-face="arial" font-size="11"/></node>
           </node>
           <border dir="col" align="center" grow="1" width="1" flood-events="1">
             <node height="20" pad="1" width="100%"><slider-h id="grid-ground-opacity"/></node>
-            <node height="20" pad="1" width="100%"><slider-h id="grid-ground-scale" value="0.5"/></node>
-            <node height="20" pad="1" width="100%"><slider-h id="grid-ground-value" value="0.5"/></node>
-            <node height="20" pad="1" width="100%"><slider-h id="grid-ground-height" value="0.5"/></node>
+            <node height="20" pad="1" width="100%"><slider-h id="grid-ground-value" value="0.0"/></node>
+            <node height="20" pad="1" width="100%"><slider-h id="grid-ground-resolution" value="0.2"/></node>
+            <node height="20" pad="1" width="100%"><slider-h id="grid-ground-offset" value="0.25"/></node>
           </border>
         </node>
-        
-        <!--<border color=".2" height="20" justify="center" align="center"><text text="Box" font-face="arial" font-size="11"/></border>
-        <node dir="row">
-          <node width="30%" dir="col">
-            <node height="20" justify="center"><text text="Opacity" font-face="arial" font-size="11"/></node>
-            <node height="20" justify="center"><text text="Width" font-face="arial" font-size="11"/></node>
-            <node height="20" justify="center"><text text="Height" font-face="arial" font-size="11"/></node>
-            <node height="20" justify="center"><text text="Depth" font-face="arial" font-size="11"/></node>
-          </node>
-          <border dir="col" align="center" grow="1" width="1" flood-events="1">
-            <node height="20" pad="1" width="100%"><slider-h id="grid-box-opacity"/></node>
-            <node height="20" pad="1" width="100%"><slider-h id="grid-box-width" value="0.5"/></node>
-            <node height="20" pad="1" width="100%"><slider-h id="grid-box-height" value="0.5"/></node>
-            <node height="20" pad="1" width="100%"><slider-h id="grid-box-depth" value="0.5"/></node>
-          </border>
-        </node>-->
-        
-        <border color=".2" height="20" justify="center" align="center"><text text="Box" font-face="arial" font-size="11"/></border>
+        <node height="10"/>
+        <border color=".2" height="20" justify="center" align="center"><text text="Heightmap" font-face="arial" font-size="11"/></border>
         <border color="1" align="center" pad="5" margin="0 0 5 0">
           <image-texture id="grid-heightmap-preview" width="100%" grow="1" height="100" aspect-ratio="1"/>
         </border>
         <node dir="row">
-          <node width="30%" dir="col">
+          <node width="40%" dir="col">
             <node height="20" justify="center"><text text="File" font-face="arial" font-size="11"/></node>
+            <node height="30" justify="center"><text text="Shading" font-face="arial" font-size="11"/></node>
+            <node height="20" justify="center"><text text="Wireframe" font-face="arial" font-size="11"/></node>
             <node height="20" justify="center"><text text="Height" font-face="arial" font-size="11"/></node>
-            <node height="20" justify="center"><text text="Offset" font-face="arial" font-size="11"/></node>
+            <node height="20" justify="center"><text text="L-Yaw" font-face="arial" font-size="11"/></node>
+            <node height="20" justify="center"><text text="L-Pitch" font-face="arial" font-size="11"/></node>
           </node>
           <border dir="col" align="center" grow="1" width="1" flood-events="1">
             <node height="20" pad="1" width="100%" dir="row">
               <node width="20" grow="1" pad="0" margin="0 0 0 2" dir="row">
-                <button id="grid-heightmap-load" text="..." width="40" height="20"></button>
+                <button id="grid-heightmap-load" text="..." width="20" height="20"></button>
                 <button id="grid-heightmap-clear" text="Clear" width="50" height="20"></button>
                 <button id="grid-heightmap-reload" text="Reload" width="50" height="20"></button>
               </node>
             </node>
-            <node height="20" pad="1" width="100%"><slider-h id="grid-heightmap-height" value="0.5"/></node>
-            <node height="20" pad="1" width="100%"><slider-h id="grid-heightmap-offset" value="0.0"/></node>
+            <node height="30" pad="1" width="100%" dir="row">
+              <combobox id="grid-heightmap-shading" text="Normal" width="100%" height="30" combo-list="Transparent,Flat,Solid" default="0"/>
+            </node>
+            <node height="20" pad="1" width="100%"><slider-h id="grid-heightmap-wireframe"/></node>
+            <node height="20" pad="1" width="100%"><slider-h id="grid-heightmap-height" value="0.25"/></node>
+            <node height="20" pad="1" width="100%"><slider-h id="grid-heightmap-lyaw" value="0.5"/></node>
+            <node height="20" pad="1" width="100%"><slider-h id="grid-heightmap-lpitch" value="0.5"/></node>
           </border>
         </node>
       
@@ -1044,7 +1035,7 @@ Here's a list of what's available in this release.
         <button-custom id="menu-about" width="60" height="100%" margin="0 0 0 0" justify="center" align="center" pad="8" color=".1">
           <text text="About" font-face="arial" font-size="11"/>
         </button-custom>
-        <!--<button id="btn-anim" width="70" height="100%" margin="1 0 0 10" text="Animate"/>-->
+        <button id="btn-anim" width="70" height="100%" margin="1 0 0 10" text="Animate"/>
         <node dir="row" justify="center" grow="1">
           <button-custom id="btn-pen" width="50" height="100%" margin="0 0 0 5" thickness="1" border-color="0 0 0 1" pad="2">
             <image path="data/ui/pen.png" width="100%" height="100%" align="center" justify="flex-end"/>
@@ -1112,11 +1103,9 @@ Here's a list of what's available in this release.
             <image path="data/ui/layers.png" width="100%" height="100%" align="center" justify="flex-end"/>
           </button-custom>
           
-          <!--
           <button-custom id="btn-grids-panel" width="50" height="50" margin="0 0 5 0" thickness="1" border-color=".1" pad="2">
             <image path="data/ui/grid.png" width="100%" height="100%" align="center" justify="flex-end" mips="true"/>
           </button-custom>
-          -->
           
         </border>
         <!-- side bar -->
@@ -1131,11 +1120,10 @@ Here's a list of what's available in this release.
             <!--Colors-->
             <!--<panel-color id="panel-color"/>-->
             <!--Grids-->
-            <!--<panel-grid/>-->
+            <panel-grid/>
           </scroll>
         </node>
         <!-- timeline -->
-        <!--
         <node height="100%" width="1" grow="1" dir="col" justify="flex-start" rtl="ltr">
           <border color=".3 .3 .3 .4" height="50" width="100%" pad="10" dir="row">
             <text text="Timeline: " font-face="arial" font-size="11" margin="8 10 0 0"/>
@@ -1145,7 +1133,6 @@ Here's a list of what's available in this release.
             </node>
           </border>
         </node>
-        -->
         
         <!--<node height="100%" width="1" grow="1" dir="col" align="center" justify="flex-start" rtl="ltr">
           <border border-color="0 0 0 0" thickness="2" color=".2 .2 .2 .6" pad="10" dir="row" margin="2 0 0 0">
diff --git a/src/app_layout.cpp b/src/app_layout.cpp
index b1865d8..b2cbd9d 100644
--- a/src/app_layout.cpp
+++ b/src/app_layout.cpp
@@ -123,11 +123,20 @@ void App::init_sidebar()
     stroke->create();
     stroke->loaded();
 
-    grid = std::make_shared<NodePanelGrid>();
-    grid->m_manager = &layout;
-    grid->init();
-    grid->create();
-    grid->loaded();
+    auto grid_find = std::find_if(panels->m_children.begin(), panels->m_children.end(), 
+        [](const std::shared_ptr<Node>&p) { return (bool)std::dynamic_pointer_cast<NodePanelGrid>(p); });
+    if (grid_find != panels->m_children.end())
+    {
+        grid = std::static_pointer_cast<NodePanelGrid>(*grid_find);
+    }
+    else
+    {
+        grid = std::make_shared<NodePanelGrid>();
+        grid->m_manager = &layout;
+        grid->init();
+        grid->create();
+        grid->loaded();
+    }
 
     presets = std::make_shared<NodePanelBrushPreset>();
     presets->m_manager = &layout;
diff --git a/src/app_shaders.cpp b/src/app_shaders.cpp
index b843016..400431b 100644
--- a/src/app_shaders.cpp
+++ b/src/app_shaders.cpp
@@ -485,7 +485,28 @@ void App::initShaders()
         "void main(){"
         "   frag = c;"
         "}";
-    
+
+    // LAMBERT
+    static const char* shader_lambert_v =
+        SHADER_VERSION
+        "uniform mat4 mvp;\n"
+        "in vec4 pos;\n"
+        "in vec3 nor;\n"
+        "out vec3 n;\n"
+        "void main(){\n"
+        "   n = nor;\n"
+        "   gl_Position = mvp * pos;\n"
+        "}";
+    static const char* shader_lambert_f =
+        SHADER_VERSION
+        "uniform mediump vec3 light_dir;\n"
+        "in mediump vec3 n;\n"
+        "out mediump vec4 frag;\n"
+        "void main(){\n"
+        "   mediump float d = max(0.0, dot(normalize(n), light_dir));\n"
+        "   frag = vec4(vec3(d), 1.0);\n"
+        "}";
+
 
     LOG("initializing shaders");
     if (!ShaderManager::create(kShader::Texture, shader_v, shader_f))
@@ -524,6 +545,8 @@ void App::initShaders()
         LOG("Failed to create shader BrushStroke");
     if (!ShaderManager::create(kShader::VertexColor, shader_vertcol_v, shader_vertcol_f))
         LOG("Failed to create shader VertexColor");
+    if (!ShaderManager::create(kShader::Lambert, shader_lambert_v, shader_lambert_f))
+        LOG("Failed to create shader Lambert");
     LOG("shaders initialized");
 }
 
diff --git a/src/image.cpp b/src/image.cpp
index 7a06d2e..f87a641 100644
--- a/src/image.cpp
+++ b/src/image.cpp
@@ -45,7 +45,7 @@ void Image::flip()
     std::swap(m_data, flipped);
 }
 
-Image Image::resize(int w, int h)
+Image Image::resize(int w, int h) const
 {
     Image ret;
     ret.create(w, h);
diff --git a/src/image.h b/src/image.h
index 9c36757..6e355bd 100644
--- a/src/image.h
+++ b/src/image.h
@@ -31,5 +31,5 @@ public:
     }
     void flip();
     void create() { m_data = std::make_unique<uint8_t[]>(size()); }
-    Image resize(int w, int h);
+    Image resize(int w, int h) const;
 };
diff --git a/src/node.h b/src/node.h
index d40c32b..b5b2df2 100644
--- a/src/node.h
+++ b/src/node.h
@@ -188,6 +188,18 @@ public:
                 return static_cast<T*>(found);
         return nullptr;
     }
+    template<class T = Node> std::shared_ptr<T> find_ref(const char* ids)
+    {
+        uint16_t id = const_hash(ids);
+        for (auto& c : m_children)
+        {
+            if (c->m_nodeID == id)
+                return std::static_pointer_cast<T>(c);
+            else if (auto found = c->find_ref(ids))
+                return std::static_pointer_cast<T>(found);
+        }
+        return nullptr;
+    }
     template<class T> T* add_child()
     {
         auto* n = new T;
diff --git a/src/node_canvas.cpp b/src/node_canvas.cpp
index 06ba559..d081d01 100644
--- a/src/node_canvas.cpp
+++ b/src/node_canvas.cpp
@@ -290,32 +290,42 @@ void NodeCanvas::draw()
     {
         glEnable(GL_DEPTH_TEST);
         glClear(GL_DEPTH_BUFFER_BIT);
+        bool blend = glIsEnabled(GL_BLEND);
+
+        auto mvp = proj * camera
+            * glm::translate(glm::vec3(0, glm::pow(App::I.grid->m_groud_offset->get_value() - 0.5f, 3), 0))
+            * glm::scale(glm::vec3(1, glm::pow(App::I.grid->m_hm_height->get_value() - 0.5f, 3.f) * 10.f, 1))
+            * glm::eulerAngleX(glm::radians(90.f));
+
+
+        // DRAW SOLID
+        glDisable(GL_BLEND);
+        ShaderManager::use(kShader::Lambert);
+        ShaderManager::u_mat4(kShaderUniform::MVP, mvp);
+        auto light_yaw = App::I.grid->m_hm_lyaw->get_value() * glm::pi<float>() * 2.f;
+        auto light_pitch = App::I.grid->m_hm_lpitch->get_value();
+        auto light_pos = glm::vec3(sinf(light_yaw), cosf(light_yaw), light_pitch);
+        ShaderManager::u_vec3(kShaderUniform::LightDir, glm::normalize(-light_pos));
+        App::I.grid->m_hm_plane.draw_fill();
 
         // DRAW GRIDS
-        ShaderManager::use(kShader::Color);
-
-        // ground grid
-        int grid_divs = glm::floor(App::I.grid->m_groud_scale->get_value() * 100);
-        if (grid_divs != m_grid_divs && (grid_divs % 2) == 0)
+        if (App::I.grid->m_hm_wireframe->get_value() > 0.f)
         {
-            m_grid_divs = grid_divs;
-            m_grid.create(1, 1, grid_divs);
+            glEnable(GL_BLEND);
+            ShaderManager::use(kShader::Color);
+            ShaderManager::u_vec4(kShaderUniform::Col, glm::vec4(
+                glm::vec3(App::I.grid->m_groud_value->get_value()),
+                App::I.grid->m_groud_opacity->get_value() * 
+                App::I.grid->m_hm_wireframe->get_value()
+            ));
+            ShaderManager::u_mat4(kShaderUniform::MVP, mvp);
+            //glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
+            //App::I.grid->m_hm_plane.draw_fill();
+            //glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
+            App::I.grid->m_hm_plane.draw_stroke();
         }
-        float grid_scale = m_grid_divs * 0.01f;
 
-        ShaderManager::u_vec4(kShaderUniform::Col, glm::vec4(
-            glm::vec3(App::I.grid->m_groud_value->get_value()),
-            App::I.grid->m_groud_opacity->get_value()));
-        ShaderManager::u_mat4(kShaderUniform::MVP, proj * camera
-            * glm::translate(glm::vec3(0, glm::pow(App::I.grid->m_groud_height->get_value() - 0.5f, 3), 0))
-            * glm::eulerAngleX(glm::radians(90.f))
-            * glm::scale(glm::vec3(grid_scale, grid_scale, 1))
-        );
-        //m_grid.draw_stroke();
-        glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
-        App::I.grid->m_hm_plane.draw_fill();
-        glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
-        App::I.grid->m_hm_plane.draw_stroke();
+        blend ? glEnable(GL_BLEND) : glDisable(GL_BLEND);
     }
 
     // box grid
diff --git a/src/node_panel_grid.cpp b/src/node_panel_grid.cpp
index 6c02855..c867d82 100644
--- a/src/node_panel_grid.cpp
+++ b/src/node_panel_grid.cpp
@@ -25,41 +25,73 @@ void NodePanelGrid::init()
 void NodePanelGrid::init_controls()
 {
     m_groud_opacity = find<NodeSliderH>("grid-ground-opacity");
-    m_groud_scale = find<NodeSliderH>("grid-ground-scale");
     m_groud_value = find<NodeSliderH>("grid-ground-value");
-    m_groud_height = find<NodeSliderH>("grid-ground-height");
-    //m_box_opacity = find<NodeSliderH>("grid-box-opacity");
-    //m_box_width = find<NodeSliderH>("grid-box-width");
-    //m_box_height = find<NodeSliderH>("grid-box-height");
-    //m_box_depth = find<NodeSliderH>("grid-box-depth");
-
-    auto update_hm = [this](Node* target, float v) {
-        m_hm_plane.create(1, 1, m_hm_image, -m_hm_height->get_value());
-    };
+    m_groud_resolution = find<NodeSliderH>("grid-ground-resolution");
+    m_groud_offset = find<NodeSliderH>("grid-ground-offset");
 
     m_hm_preview = find<NodeImageTexture>("grid-heightmap-preview");
     m_hm_load = find<NodeButton>("grid-heightmap-load");
-    m_hm_offset = find<NodeSliderH>("grid-heightmap-offset");
+    m_hm_clear = find<NodeButton>("grid-heightmap-clear");
+    m_hm_reload = find<NodeButton>("grid-heightmap-reload");
+    m_hm_wireframe = find<NodeSliderH>("grid-heightmap-wireframe");
     m_hm_height = find<NodeSliderH>("grid-heightmap-height");
+    m_hm_lyaw = find<NodeSliderH>("grid-heightmap-lyaw");
+    m_hm_lpitch = find<NodeSliderH>("grid-heightmap-lpitch");
 
-    m_hm_height->on_value_changed = update_hm;
+    //m_hm_height->on_value_changed = update_hm;
+    m_groud_resolution->on_value_changed = [this](Node* target, float v) {
+        if (m_hm_image.data())
+            m_hm_plane.create(1, 1, m_hm_image, v * 5.f);
+        else
+            m_hm_plane.create(1, 1, 100 * v * 5.f);
+        LOG("resolution value %f", v);
+    };
     m_hm_preview->SetHeight(0);
 
-    //m_hm_plane.create(1, 1);
+    m_hm_plane.create(1, 1, 100);
 
     m_hm_load->on_click = [this](Node*) {
         App::I.pick_image([this](std::string path) {
             Image img;
+            async_start();
             if (img.load_file(path))
             {
+                m_file_path = path;
                 m_hm_image = img.resize(128, 128);
                 m_hm_preview->tex.create(m_hm_image);
                 m_hm_preview->tex.create_mipmaps();
                 auto sz = m_hm_preview->tex.size();
                 m_hm_preview->SetAspectRatio(sz.x / sz.y);
-                m_hm_plane.create(1, 1, m_hm_image, -m_hm_height->get_value());
+                m_hm_plane.create(1, 1, m_hm_image, m_groud_resolution->get_value() * 5.f);
                 m_hm_preview->SetHeight(100);
+                if (m_groud_opacity->get_value() == 0.f)
+                    m_groud_opacity->set_value(1.f);
             }
+            async_update();
+            async_end();
         });
     };
+
+    m_hm_clear->on_click = [this](Node*)
+    {
+        m_hm_plane.create(1, 1, 100 * m_groud_resolution->get_value() * 5.f);
+        m_hm_image.destroy();
+        m_hm_preview->tex.destroy();
+        m_hm_preview->SetHeight(0);
+    };
+
+    m_hm_reload->on_click = [this](Node*)
+    {
+        Image img;
+        if (img.load_file(m_file_path))
+        {
+            m_hm_image = img.resize(128, 128);
+            m_hm_preview->tex.create(m_hm_image);
+            m_hm_preview->tex.create_mipmaps();
+            auto sz = m_hm_preview->tex.size();
+            m_hm_preview->SetAspectRatio(sz.x / sz.y);
+            m_hm_plane.create(1, 1, m_hm_image, m_groud_resolution->get_value() * 5.f);
+            m_hm_preview->SetHeight(100);
+        }
+    };
 }
diff --git a/src/node_panel_grid.h b/src/node_panel_grid.h
index e64e9e5..d449cf7 100644
--- a/src/node_panel_grid.h
+++ b/src/node_panel_grid.h
@@ -14,19 +14,21 @@ class NodePanelGrid : public Node
 {
 public:
     NodeSliderH* m_groud_opacity;
-    NodeSliderH* m_groud_scale;
     NodeSliderH* m_groud_value;
-    NodeSliderH* m_groud_height;
-    NodeSliderH* m_box_opacity;
-    NodeSliderH* m_box_width;
-    NodeSliderH* m_box_height;
-    NodeSliderH* m_box_depth;
+    NodeSliderH* m_groud_resolution;
+    NodeSliderH* m_groud_offset;
     NodeImageTexture* m_hm_preview;
     NodeButton* m_hm_load;
-    NodeSliderH* m_hm_offset;
+    NodeButton* m_hm_clear;
+    NodeButton* m_hm_reload;
+    NodeComboBox* m_hm_shading;
     NodeSliderH* m_hm_height;
+    NodeSliderH* m_hm_wireframe;
+    NodeSliderH* m_hm_lyaw;
+    NodeSliderH* m_hm_lpitch;
     HeightmapPlane m_hm_plane;
     Image m_hm_image;
+    std::string m_file_path;
 
     virtual Node* clone_instantiate() const override;
     virtual void clone_finalize(Node* dest) const override;
diff --git a/src/pch.h b/src/pch.h
index 90f826d..cbd96b7 100644
--- a/src/pch.h
+++ b/src/pch.h
@@ -107,6 +107,7 @@
 #include <glm/gtx/vector_angle.hpp>
 #include <glm/gtx/intersect.hpp>
 #include <glm/gtx/component_wise.hpp>
+#include <glm/gtx/normal.hpp>
 
 #include <tinyxml2.h>
 #include <jpge.h>
diff --git a/src/shader.cpp b/src/shader.cpp
index be1ef02..6e4974d 100644
--- a/src/shader.cpp
+++ b/src/shader.cpp
@@ -75,6 +75,9 @@ bool Shader::create(const char* vertex, const char* fragment)
     if (glGetAttribLocation(ps, "col") != -1)
         glBindAttribLocation(ps, 3, "col");
 
+    if (glGetAttribLocation(ps, "nor") != -1)
+        glBindAttribLocation(ps, 3, "nor");
+
     glLinkProgram(ps);
     glGetProgramiv(ps, GL_LINK_STATUS, &status);
     glGetProgramInfoLog(ps, sizeof(infolog), &infolen, infolog);
@@ -117,6 +120,12 @@ void Shader::u_vec4(kShaderUniform id, const glm::vec4& v)
         LOG("UNIFORM vec4 %d NOT FOUND in shader %d", (int)id, (int)name)
     else glUniform4fv(m_umap[id], 1, glm::value_ptr(v));
 }
+void Shader::u_vec3(kShaderUniform id, const glm::vec3& v)
+{
+    if (m_umap.count(id) == 0)
+        LOG("UNIFORM vec3 %d NOT FOUND in shader %d", (int)id, (int)name)
+    else glUniform3fv(m_umap[id], 1, glm::value_ptr(v));
+}
 
 void Shader::u_vec2(kShaderUniform id, const glm::vec2& v)
 {
@@ -171,6 +180,11 @@ void ShaderManager::u_vec4(kShaderUniform id, const glm::vec4& v)
     m_current->u_vec4(id, v);
 }
 
+void ShaderManager::u_vec3(kShaderUniform id, const glm::vec3& v)
+{
+    m_current->u_vec3(id, v);
+}
+
 void ShaderManager::u_vec2(kShaderUniform id, const glm::vec2& v)
 {
     m_current->u_vec2(id, v);
diff --git a/src/shader.h b/src/shader.h
index 59367c9..2ca307b 100644
--- a/src/shader.h
+++ b/src/shader.h
@@ -29,6 +29,7 @@ enum class kShaderUniform : uint16_t
     Noise = const_hash("noise"),
     Direction = const_hash("dir"),
     UseFragCoordUV2 = const_hash("fragUV2"),
+    LightDir = const_hash("light_dir"),
 };
 
 enum class kShader : uint16_t
@@ -52,6 +53,7 @@ enum class kShader : uint16_t
     Equirect    = const_hash("equirect"),
     BrushStroke = const_hash("brush-stroke"),
     VertexColor = const_hash("vertex-color"),
+    Lambert     = const_hash("lambert"),
 };
 
 class Shader
@@ -63,6 +65,7 @@ public:
     bool create(const char* vertex, const char* fragment);
     void use();
     void u_vec4(kShaderUniform id, const glm::vec4& v);
+    void u_vec3(kShaderUniform id, const glm::vec3& v);
     void u_vec2(kShaderUniform id, const glm::vec2& v);
     void u_mat4(kShaderUniform id, const glm::mat4& m);
     void u_int(kShaderUniform id, int i);
@@ -80,6 +83,7 @@ public:
     static void use(const char* name);
     static Shader* get(kShader id);
     static void u_vec4(kShaderUniform id, const glm::vec4& v);
+    static void u_vec3(kShaderUniform id, const glm::vec3& v);
     static void u_vec2(kShaderUniform id, const glm::vec2& v);
     static void u_mat4(kShaderUniform id, const glm::mat4& m);
     static void u_int(kShaderUniform id, int i);
diff --git a/src/shape.cpp b/src/shape.cpp
index 76d0657..6e6d5f9 100644
--- a/src/shape.cpp
+++ b/src/shape.cpp
@@ -43,11 +43,13 @@ bool Shape::create_buffers_imp(GLvoid* idx, GLvoid* vertices, int isize, int vsi
         glEnableVertexAttribArray(0);
         glEnableVertexAttribArray(1);
         glEnableVertexAttribArray(2);
+        glEnableVertexAttribArray(3);
         glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, buffers[1]);
         glBindBuffer(GL_ARRAY_BUFFER, buffers[0]);
         glVertexAttribPointer(0, 4, GL_FLOAT, GL_FALSE, sizeof(vertex_t), (GLvoid*)0);
         glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, sizeof(vertex_t), (GLvoid*)offsetof(vertex_t, uvs));
         glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, sizeof(vertex_t), (GLvoid*)offsetof(vertex_t, uvs2));
+        glVertexAttribPointer(3, 3, GL_FLOAT, GL_FALSE, sizeof(vertex_t), (GLvoid*)offsetof(vertex_t, nor));
     }
     glBindVertexArray(0);
 #endif
@@ -81,10 +83,12 @@ bool Shape::create_buffers(GLvoid* vertices, int vsize)
         glEnableVertexAttribArray(0);
         glEnableVertexAttribArray(1);
         glEnableVertexAttribArray(2);
+        glEnableVertexAttribArray(3);
         glBindBuffer(GL_ARRAY_BUFFER, buffers[0]);
         glVertexAttribPointer(0, 4, GL_FLOAT, GL_FALSE, sizeof(vertex_t), (GLvoid*)0);
         glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, sizeof(vertex_t), (GLvoid*)offsetof(vertex_t, uvs));
         glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, sizeof(vertex_t), (GLvoid*)offsetof(vertex_t, uvs2));
+        glVertexAttribPointer(3, 3, GL_FLOAT, GL_FALSE, sizeof(vertex_t), (GLvoid*)offsetof(vertex_t, nor));
     }
     glBindVertexArray(0);
 #endif
@@ -239,20 +243,29 @@ void Plane::create_impl(float w, float h, int div, GLushort *idx, vertex_t *vert
 
 bool HeightmapPlane::create(float w, float h, const Image& img, float scale)
 {
-    int div = img.width - 1; // TODO: handle height also
+    Image img_tmp;
+    glm::u8vec4* px = (glm::u8vec4*)img.data();
+    glm::vec2 new_size = glm::clamp(glm::ceil(glm::vec2(img.width, img.height) * scale), { 16, 16 }, glm::vec2(8192));
+    if (scale != 1.f)
+    {
+        img_tmp = img.resize(new_size.x, new_size.y);
+        px = (glm::u8vec4*)img_tmp.data();
+    }
+
+    int div = new_size.x - 1; // TODO: handle height also
     int idx_size = (div * div * 6) + (div * (div + 1) * 4);
     int vertices_size = (div + 1)*(div + 1);
-    auto idx = std::make_unique<GLuint[]>(idx_size);
-    auto vertices = std::make_unique<vertex_t[]>(vertices_size);
+    std::vector<GLuint> idx(idx_size);
+    std::vector<vertex_t> vertices(vertices_size);
+    std::vector<int> nor_count((size_t)vertices_size, 0);
 
     count[0] = div * div * 6;
     count[1] = div * (div + 1) * 4;
     ioff[0] = (GLvoid*)0;
     ioff[1] = (GLvoid*)(count[0] * sizeof(GLuint));
 
-    auto pv = vertices.get();
-    auto pi = idx.get();
-    auto px = (glm::u8vec4*)img.data();
+    auto pv = vertices.data();
+    auto pi = idx.data();
 
     const float dx = w / div;
     const float dy = h / div;
@@ -265,13 +278,99 @@ bool HeightmapPlane::create(float w, float h, const Image& img, float scale)
             vertex_t v;
             v.pos.x = ox + dx * (float)x;
             v.pos.y = oy + dy * (float)y;
-            v.pos.z = (*px++).r / 255.f * scale;
+            v.pos.z = (*px++).r / 255.f;
             v.pos.w = 1;
             v.uvs2 = v.uvs = glm::vec2(x, y) / (float)div;
             *pv++ = v;
         }
     }
 
+    // generate indices
+    for (int y = 0; y < div; y++)
+    {
+        int i = y * (div + 1);
+        for (int x = 0; x < div; x++)
+        {
+            *pi++ = i;
+            *pi++ = i + div + 1;
+            *pi++ = i + div + 2;
+            *pi++ = i;
+            *pi++ = i + div + 2;
+            *pi++ = i + 1;
+            auto n = glm::triangleNormal(xyz(vertices[i].pos), 
+                xyz(vertices[i + div + 1].pos), xyz(vertices[i + 1].pos));
+            vertices[i].nor += n;
+            vertices[i + 1].nor += n;
+            vertices[i + div + 1].nor += n;
+            vertices[i + div + 2].nor += n;
+            nor_count[i]++;
+            nor_count[i + 1]++;
+            nor_count[i + div + 1]++;
+            nor_count[i + div + 2]++;
+            i++;
+        }
+    }
+
+    for (int i = 0; i < vertices_size; i++)
+        vertices[i].nor /= (float)nor_count[i];
+
+    // generate indices
+    for (int y = 0; y <= div; y++)
+    {
+        //int i = y * (div + 1);
+        for (int x = 0; x <= div; x++)
+        {
+            if (x < div)
+            {
+                *pi++ = y * (div + 1) + x;
+                *pi++ = y * (div + 1) + x + 1;
+            }
+
+            if (y < div)
+            {
+                *pi++ = y * (div + 1) + x;
+                *pi++ = (y + 1) * (div + 1) + x;
+            }
+        }
+    }
+
+    return create_buffers(idx.data(), vertices.data(), sizeof(GLuint) * idx_size, sizeof(vertex_t) * vertices_size);
+}
+
+bool HeightmapPlane::create(float w, float h, int div)
+{
+    int idx_size = (div * div * 6) + (div * (div + 1) * 4);
+    int vertices_size = (div + 1)*(div + 1);
+    auto idx = std::make_unique<GLuint[]>(idx_size);
+    auto vertices = std::make_unique<vertex_t[]>(vertices_size);
+
+    count[0] = div * div * 6;
+    count[1] = div * (div + 1) * 4;
+    ioff[0] = (GLvoid*)0;
+    ioff[1] = (GLvoid*)(count[0] * sizeof(GLuint));
+
+    auto pv = vertices.get();
+    auto pi = idx.get();
+
+    const float dx = w / div;
+    const float dy = h / div;
+    const float ox = -w * 0.5f;
+    const float oy = -h * 0.5f;
+    for (int y = 0; y <= div; y++)
+    {
+        for (int x = 0; x <= div; x++)
+        {
+            vertex_t v;
+            v.pos.x = ox + dx * (float)x;
+            v.pos.y = oy + dy * (float)y;
+            v.pos.z = 0.f;
+            v.pos.w = 1.f;
+            v.uvs2 = v.uvs = glm::vec2(x, y) / (float)div;
+            v.nor = { 0, 1, 0 };
+            *pv++ = v;
+        }
+    }
+
     // generate indices
     for (int y = 0; y < div; y++)
     {
diff --git a/src/shape.h b/src/shape.h
index 30ff600..28bf367 100644
--- a/src/shape.h
+++ b/src/shape.h
@@ -126,6 +126,7 @@ class HeightmapPlane : public Shape
 {
 public:
     bool create(float w, float h, const Image& img, float scale);
+    bool create(float w, float h, int div);
 };
 
 class RectShape : public Shape
diff --git a/src/texture.cpp b/src/texture.cpp
index d771d21..a3b588b 100644
--- a/src/texture.cpp
+++ b/src/texture.cpp
@@ -39,6 +39,7 @@ void TextureManager::invalidate()
 
 bool Texture2D::create(int width, int height, GLint internal_format, GLint format, const uint8_t* data)
 {
+    destroy();
     m_width = width;
     m_height = height;
     m_format = format;
diff --git a/src/util.h b/src/util.h
index 7b66a5f..8e5c6ab 100644
--- a/src/util.h
+++ b/src/util.h
@@ -11,14 +11,15 @@ struct vertex_t
     glm::vec4 pos;
     glm::vec2 uvs;
     glm::vec2 uvs2;
-    vertex_t() : pos(0), uvs(0), uvs2(0) {}
-    vertex_t(glm::vec2 p) : pos(p, 0, 1), uvs(0), uvs2(0) {}
-    vertex_t(glm::vec2 p, glm::vec2 uv) : pos(p, 0, 1), uvs(uv), uvs2(0) {}
-    vertex_t(glm::vec3 p) : pos(p, 1), uvs(0), uvs2(0) {}
-    vertex_t(glm::vec3 p, glm::vec2 uv) : pos(p, 1), uvs(uv), uvs2(0) {}
-    vertex_t(glm::vec4 p) : pos(p), uvs(0), uvs2(0) {}
-    vertex_t(glm::vec4 p, glm::vec2 uv) : pos(p), uvs(uv), uvs2(0) {}
-    vertex_t(glm::vec4 p, glm::vec2 uv, glm::vec2 uv2) : pos(p), uvs(uv), uvs2(uv2) {}
+    glm::vec3 nor;
+    vertex_t() : pos(0), uvs(0), uvs2(0), nor(0) {}
+    vertex_t(glm::vec2 p) : pos(p, 0, 1), uvs(0), uvs2(0), nor(0) {}
+    vertex_t(glm::vec2 p, glm::vec2 uv) : pos(p, 0, 1), uvs(uv), uvs2(0), nor(0) {}
+    vertex_t(glm::vec3 p) : pos(p, 1), uvs(0), uvs2(0), nor(0) {}
+    vertex_t(glm::vec3 p, glm::vec2 uv) : pos(p, 1), uvs(uv), uvs2(0), nor(0) {}
+    vertex_t(glm::vec4 p) : pos(p), uvs(0), uvs2(0), nor(0) {}
+    vertex_t(glm::vec4 p, glm::vec2 uv) : pos(p), uvs(uv), uvs2(0), nor(0) {}
+    vertex_t(glm::vec4 p, glm::vec2 uv, glm::vec2 uv2) : pos(p), uvs(uv), uvs2(uv2), nor(0) {}
 };
 
 uint16_t constexpr const_hash(const char* input)