diff --git a/builds/draw.o b/builds/draw.o
deleted file mode 100644
index bd215e4..0000000
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diff --git a/builds/draw_bonus.o b/builds/draw_bonus.o
new file mode 100644
index 0000000..2eed6e9
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diff --git a/builds/fdf.o b/builds/fdf.o
index 76d79d6..adebeb9 100644
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diff --git a/builds/keypress.o b/builds/keypress.o
deleted file mode 100644
index 872fdff..0000000
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diff --git a/builds/keypress_bonus.o b/builds/keypress_bonus.o
new file mode 100644
index 0000000..1085807
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diff --git a/builds/modifs.o b/builds/modifs.o
index 46ab7d3..a613194 100644
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diff --git a/builds/parse.o b/builds/parse.o
index f6e44bc..c92ea48 100644
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diff --git a/fdf b/fdf
index 7b165f6..018bcd4 100755
Binary files a/fdf and b/fdf differ
diff --git a/includes/fdf.h b/includes/fdf.h
index d30690e..84e94bd 100644
--- a/includes/fdf.h
+++ b/includes/fdf.h
@@ -68,6 +68,11 @@ int		is_color(char *color);
 void	size_map(t_fdf *fdf, char *raw, int height);
 int		**parse_map(t_fdf *fdf, int fd);
 
+// steps size for the hight transform with p and o
+// must be > 0
+// 100 is small, 1 is the biggest
+# define Z_HIGHT			10
+
 # define ESCAPE			65307
 # define UP				65362
 # define DOWN			65364
diff --git a/srcs/draw_bonus.c b/srcs/draw_bonus.c
index 4d1e969..d89679f 100644
--- a/srcs/draw_bonus.c
+++ b/srcs/draw_bonus.c
@@ -75,7 +75,8 @@ void	draw_color_pixel(t_fdf *fdf, int new_x, int new_y, int z)
 
 	color = 0xffffff;
 	z -= (z * fdf->zoom) / fdf->offset;
-	z /= fdf->altitude;
+	if (z > 0)
+		z /= fdf->altitude;
 	if (z > fdf->min_z && fdf->z_amplitude)
 	{
 		color = color ^ (((0xff / fdf->z_amplitude) * (z - fdf->min_z)) << 16);
diff --git a/srcs/keypress_bonus.c b/srcs/keypress_bonus.c
index b0b0801..d6121dd 100644
--- a/srcs/keypress_bonus.c
+++ b/srcs/keypress_bonus.c
@@ -30,7 +30,7 @@ void	keypress_more(int keycode, t_fdf *fdf)
 	else if (keycode == O)
 		fdf->altitude++;
 	else if (keycode == P)
-		if (fdf->altitude > 1)
+		if (fdf->altitude > 0)
 			fdf->altitude--;
 }
 
diff --git a/srcs/modifs.c b/srcs/modifs.c
index 74031cc..f18fa2e 100644
--- a/srcs/modifs.c
+++ b/srcs/modifs.c
@@ -28,8 +28,14 @@ int	*new_coordinates(t_fdf *fdf, int i, int j)
 	y = j * (fdf->offset + fdf->zoom);
 	x -= (fdf->map_size_x + fdf->zoom * fdf->map_width) / 2;
 	y -= (fdf->map_size_y + fdf->zoom * fdf->map_height) / 2;
-	z = fdf->map[j][i] * fdf->altitude;
+	if (fdf->altitude > 0)
+		z = fdf->map[j][i] * fdf->altitude;
+	else if (fdf->altitude == 0)
+		z = 0;
+	else
+		z = fdf->map[j][i];
 	z += (z * fdf->zoom) / fdf->offset;
+	z /= Z_HIGHT;
 	point[0] = x * cos(fdf->rad_x) + y * sin(fdf->rad_x);
 	point[1] = y * cos(fdf->rad_x) - x * sin(fdf->rad_x);
 	point[1] = point[1] * cos(fdf->rad_y) - -z * sin(fdf->rad_y);