diff --git a/CMakeLists.txt b/CMakeLists.txt
index 38aea7e..c5b878c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -236,10 +236,13 @@ function(create_project_from_sources chapter demo)
              "src/${chapter}/${demo}/*.fs"
              "src/${chapter}/${demo}/*.gs"
     )
+	# copy dlls
+	file(GLOB DLLS "dlls/*.dll")
     foreach(SHADER ${SHADERS})
         if(WIN32)
             # configure_file(${SHADER} "test")
             add_custom_command(TARGET ${NAME} PRE_BUILD COMMAND ${CMAKE_COMMAND} -E copy ${SHADER} $<TARGET_FILE_DIR:${NAME}>)
+			add_custom_command(TARGET ${NAME} PRE_BUILD COMMAND ${CMAKE_COMMAND} -E copy ${DLLS} $<TARGET_FILE_DIR:${NAME}>)
         elseif(UNIX AND NOT APPLE)
             file(COPY ${SHADER} DESTINATION ${CMAKE_SOURCE_DIR}/bin/${chapter})
         elseif(APPLE)
diff --git a/src/8.guest/2020/skeletal_animation/anim_model.vs b/src/8.guest/2020/skeletal_animation/anim_model.vs
index 552adb2..6caec57 100644
--- a/src/8.guest/2020/skeletal_animation/anim_model.vs
+++ b/src/8.guest/2020/skeletal_animation/anim_model.vs
@@ -3,8 +3,10 @@
 layout(location = 0) in vec3 pos;
 layout(location = 1) in vec3 norm;
 layout(location = 2) in vec2 tex;
-layout(location = 3) in ivec4 boneIds; 
-layout(location = 4) in vec4 weights;
+layout(location = 3) in vec3 tangent;
+layout(location = 4) in vec3 bitangent;
+layout(location = 5) in ivec4 boneIds; 
+layout(location = 6) in vec4 weights;
 
 uniform mat4 projection;
 uniform mat4 view;