diff --git a/Makefile b/Makefile
index f44fbc0..8962547 100644
--- a/Makefile
+++ b/Makefile
@@ -15,6 +15,7 @@ EXAMPLES = \
 	example/basic \
 	example/riemman \
 	example/n-cube \
+	example/n-hilbert-cube \
 	example/lens
 
 CFLAGS = \
@@ -24,17 +25,6 @@ CFLAGS = \
 	-I./include  \
 	-Wall -Wno-unused-function -std=c99 -D_GNU_SOURCE \
 
-WAYLAND-LIB = \
-	xdg-shell \
-	relative-pointer-unstable-v1 \
-	xdg-decoration-unstable-v1 \
-	pointer-constraints-unstable-v1 \
-	viewporter \
-	idle-inhibit-unstable-v1  \
-	fractional-scale-v1 \
-	xdg-activation-v1 \
-	wayland
-
 help:
 	@echo "Usage:"
 	@echo "	$(MAKE) windows"
@@ -59,11 +49,11 @@ glfw.dll:
 # LINUX
 linux-wayland: $(OBJ)
 	cd ext; $(MAKE) -f glfw.mk linux-wayland; cd -
-	$(CC) -o $(BIN) $(OBJ) ext/libglfw.a -lGL -lm
+	$(CC) -o $(BIN) $(OBJ) ext/libglfw.a -lm
 
 linux-x11: $(OBJ)
 	cd ext; $(MAKE) -f glfw.mk linux-x11; cd -
-	$(CC) -o $(BIN) $(OBJ) ext/libglfw.a -lGL -lm
+	$(CC) -o $(BIN) $(OBJ) ext/libglfw.a -lm 
 
 cocoa: $(OBJ)
 	cd ext; $(MAKE) -f glfw.mk cocoa; cd -
@@ -73,9 +63,6 @@ wasm: $(OBJ)
 	$(CC) -sUSE_WEBGL2=1 -sUSE_GLFW=3 -o $(BIN).html $(OBJ)
 	chmod -x $(BIN).wasm
 
-libglfw.so: 
-	$(CC) -fPIC -shared $(DFLAGS) -D_GLFW_BUILD_DLL -Iext/glfw/deps/wayland ./ext/glfw/src/*.c -o $@ 
-
 clean:
 	rm $(OBJ) $(BIN) $(EXAMPLES)
 	cd ext; $(MAKE) -f glfw.mk clean; cd -
@@ -89,5 +76,4 @@ examples: $(EXAMPLES)
 	$(CC) -Wno-implicit-function-declaration $(CFLAGS) -c -o $@ $<
 
 .c:
-	$(CC) -lm -Wno-implicit-function-declaration $(CFLAGS) -c -o $@ $<
-	
+	$(CC) -I include  -o $@ $< -lm
diff --git a/include/klein/klein.h b/include/klein/klein.h
index 6265adf..663c8f1 100644
--- a/include/klein/klein.h
+++ b/include/klein/klein.h
@@ -39,8 +39,8 @@ int klein_export_file(struct klein klein, const char * filename)
 	fwrite("\0", 1, 1, file);
 	fwrite(&klein.dim, 1, 1, file);
 	fwrite(&klein.vertex_size, 8, 1, file);
-	fwrite(klein.vertex, 16, klein.vertex_size * klein.dim, file);
-	fwrite(klein.normals, 16, klein.vertex_size * klein.dim, file);
+	fwrite(klein.vertex, 4, klein.vertex_size * klein.dim, file);
+	fwrite(klein.normals, 4, klein.vertex_size * klein.dim, file);
 
 	fclose(file);
 	return 0;
diff --git a/src/input.c b/src/input.c
index 8a0f1a8..9a4f60e 100644
--- a/src/input.c
+++ b/src/input.c
@@ -1,4 +1,5 @@
 #include "main.h"
+#include <glad.h>
 #include <GLFW/glfw3.h>
 #include <cglm/quat.h>
 #include <stdio.h>
@@ -21,6 +22,12 @@ vec3 axis[3] = {
 
 extern struct projection projection;
 
+void __error_callback_input(int x, const char * msg )
+{
+	mlog("[GLFW] ");
+	mlog(msg);
+	mlog("\n");
+}
 void __key_callback_input(
 	GLFWwindow *window, int key, int scancode, int action, int mods)
 {
diff --git a/src/klein.c b/src/klein.c
index 8add64b..f2a747d 100644
--- a/src/klein.c
+++ b/src/klein.c
@@ -35,10 +35,10 @@ int create_surface_klein(unsigned char *path, struct surface *surface)
 
 	size = surface->dim * surface->vertex;
 
-	surface->data = malloc(16 * size);
-	fread(surface->data, 16, size, file);
+	surface->data = malloc(4 * size);
+	fread(surface->data, 4, size, file);
 
-	surface->norm = malloc(16 * size);
-	fread(surface->norm, 16, size, file);
+	surface->norm = malloc(4 * size);
+	fread(surface->norm, 4, size, file);
 	return 0;
 }
diff --git a/src/main.h b/src/main.h
index 6ae5ebd..8e62051 100644
--- a/src/main.h
+++ b/src/main.h
@@ -5,6 +5,7 @@
 */
 
 #define DEBUG
+#define GLFW_INCLUDE_NONE
 
 typedef const void *window_t;
 typedef unsigned int id_t;
diff --git a/src/window.c b/src/window.c
index 521e673..97bf753 100644
--- a/src/window.c
+++ b/src/window.c
@@ -8,6 +8,7 @@ void __mouse_callback_input(GLFWwindow *, int, int, int);
 void __scroll_callback_input(GLFWwindow *, double, double);
 void __key_callback_input(GLFWwindow *, int, int, int, int);
 void __drop_callback_input(GLFWwindow *, int, const char **);
+void __error_callback_input(int, const char *);
 
 window_t init_window(unsigned int w, unsigned int h, const char *name);
 
@@ -44,6 +45,7 @@ static void __limit_fps_window(int max_fps)
 window_t init_window(unsigned int width, unsigned int height, const char *title)
 {
 	window_t window;
+	glfwSetErrorCallback(__error_callback_input);
 
 	if (!glfwInit())
 		return NULL;
@@ -51,6 +53,7 @@ window_t init_window(unsigned int width, unsigned int height, const char *title)
 	glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
 	glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
 	glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
+	glfwWindowHint(GLFW_OPENGL_DEBUG_CONTEXT, 1); 
 
 	window = (window_t)glfwCreateWindow(width, height, title, NULL, NULL);
 	if (!(window))
@@ -67,8 +70,6 @@ window_t init_window(unsigned int width, unsigned int height, const char *title)
 	glfwSetKeyCallback((GLFWwindow *)window, __key_callback_input);
 	glfwSetDropCallback((GLFWwindow *)window, __drop_callback_input);
 
-	__window_callback_input((GLFWwindow *)window, width, height);
-
 	return window;
 }