diff --git a/Makefile b/Makefile
index a3f9e7e..fb5cf0c 100644
--- a/Makefile
+++ b/Makefile
@@ -30,7 +30,8 @@ ARCH		?= $(shell uname -m || echo unknown)
 ifeq ($(shell uname -s),Darwin)
 	PLATFORM		:= macOS
 	PLATFORM_DIR	:= mac
-	THREADS			:= $(shell sysctl -n hw.ncpu || echo 1)
+	THREADS			:= 1
+# 	THREADS			:= $(shell sysctl -n hw.ncpu || echo 1)
 	OS_LIBFT		:= libft/mac
 	MLX_DIR			:= $(MLX)_macos
 	MLX_A			:= $(MLX_DIR)/libmlx.a
@@ -38,7 +39,8 @@ ifeq ($(shell uname -s),Darwin)
 else
 	PLATFORM		:= $(shell uname -s || echo unknown)
 	PLATFORM_DIR	:= linux
-	THREADS			:= $(shell getconf _NPROCESSORS_ONLN 2>/dev/null || echo 1)
+	THREADS			:= 1
+# 	THREADS			:= $(shell getconf _NPROCESSORS_ONLN 2>/dev/null || echo 1)
 	OS_LIBFT		:= libft/linux
 	MLX_DIR			:= $(MLX)-linux
 	MLX_A			:= $(MLX_DIR)/libmlx_Linux.a
diff --git a/includes/config.h b/includes/config.h
index fb87720..e5abc6a 100644
--- a/includes/config.h
+++ b/includes/config.h
@@ -19,6 +19,7 @@
 # define PROGRAM "miniRT"
 # define EXECUTION "./miniRT"
 # define EPSILON 1e-6
+# define NORM_EPSILON 1e-3
 # define DBL_MAX __DBL_MAX__
 
 # if defined(__APPLE__)
@@ -77,13 +78,6 @@
 # define MOUSE_SCROLL_UP 4
 # define MOUSE_SCROLL_DOWN 5
 
-# if defined(__APPLE__)
-#  define ESC_KEY 53
-# else
-#  include <X11/keysym.h>
-#  define ESC_KEY XK_Escape
-# endif
-
 # define VALID 1
 # define INVALID 0
 
diff --git a/includes/miniRT.h b/includes/miniRT.h
index b382043..af549e8 100644
--- a/includes/miniRT.h
+++ b/includes/miniRT.h
@@ -60,7 +60,7 @@ int		clamp_color(double value);
 void	print_error(char *msg, ...);
 
 // free
-void	free_scene(t_scene *scene);
+void	free_scene(t_scene **scene);
 void	free_ctx(t_ctx *ctx);
 
 #endif
diff --git a/srcs/free.c b/srcs/free.c
index aa53e96..087ffe6 100644
--- a/srcs/free.c
+++ b/srcs/free.c
@@ -12,27 +12,26 @@
 
 #include "miniRT.h"
 
-void	free_scene(t_scene *scene)
+void	free_scene(t_scene **scene)
 {
 	t_obj	*current;
 	t_obj	*next;
 
-	if (scene)
+	if (!scene || !*scene)
+		return ;
+	if ((*scene)->objects)
 	{
-		if (scene->objects)
+		current = (*scene)->objects;
+		while (current)
 		{
-			current = scene->objects;
-			while (current)
-			{
-				next = current->next;
-				free(current->obj_data);
-				free(current);
-				current = next;
-			}
+			next = current->next;
+			free(current->obj_data);
+			free(current);
+			current = next;
 		}
-		free(scene);
 	}
-	scene = NULL;
+	free(*scene);
+	*scene = NULL;
 }
 
 void	free_ctx(t_ctx *ctx)
@@ -42,6 +41,6 @@ void	free_ctx(t_ctx *ctx)
 	if (ctx->img)
 		free(ctx->img);
 	if (ctx->scene)
-		free_scene(ctx->scene);
+		free_scene(&ctx->scene);
 	free(ctx);
 }
diff --git a/srcs/parsing/object_list.c b/srcs/parsing/object_list.c
index ab8abdc..7728139 100644
--- a/srcs/parsing/object_list.c
+++ b/srcs/parsing/object_list.c
@@ -19,7 +19,7 @@ t_obj	*create_object_node(t_obj_type type, void *obj)
 	node = (t_obj *)malloc(sizeof(t_obj));
 	if (!node)
 	{
-		perror("");
+		print_error(ERR_MSG_MALLOC);
 		return (NULL);
 	}
 	node->type = type;
diff --git a/srcs/parsing/parse.c b/srcs/parsing/parse.c
index 9622f01..b2c117c 100644
--- a/srcs/parsing/parse.c
+++ b/srcs/parsing/parse.c
@@ -110,12 +110,12 @@ t_scene	*parse_scene(char *filename)
 	read_flags = 0;
 	if (parse_file(filename, scene, &read_flags) < 0)
 	{
-		free_scene(scene);
+		free_scene(&scene);
 		return (NULL);
 	}
 	if (!validate_scene(read_flags))
 	{
-		free_scene(scene);
+		free_scene(&scene);
 		return (NULL);
 	}
 	return (scene);
diff --git a/srcs/parsing/validate_values.c b/srcs/parsing/validate_values.c
index f64caff..b4f8b30 100644
--- a/srcs/parsing/validate_values.c
+++ b/srcs/parsing/validate_values.c
@@ -42,7 +42,7 @@ int	validate_normalized_vec3(t_vec3 vec)
 	double	len_squared;
 
 	len_squared = vec3_dot(vec, vec);
-	if (fabs(len_squared - 1.0) > EPSILON)
+	if (fabs(len_squared - 1.0) > NORM_EPSILON)
 		return (INVALID);
 	return (VALID);
 }