diff --git a/README.md b/README.md
index a12517b..1803499 100644
--- a/README.md
+++ b/README.md
@@ -62,22 +62,22 @@ Example:
 //!load ...
 //!steps 5
 
-uniform int STEP;
-uniform int STEPS;
+uniform int STEP; // this is mandatory!
 
 void fragment() {
   if (STEP == 0) {
-	  ...
+	...
   } else if (STEP == 1) {
-	  ...
-  } else if (STEP == STEPS-1) {
-    ...
+	...
   }
+  // ... and so on
 }
 ```
 
 ## Shaderlib
 
+> Note: The shaderlib API is still unstable as I am figuring things out. It will be declared stable with version 10.
+
 This repo comes with a (still small) shader library including pre-written functions and more.  
 Have a look at the `shaderlib` folder.
 
@@ -153,4 +153,5 @@ Since version v8.0, you can pass a directory to `--load-image` and `--output`. T
 ## Known Issues
 
 - screen scaling is unsupported; Using screen scaling could lead to an either blurry UI, or no scaling at all -> see #45
+- the shaderlib API is still unstable, this will change with version 10
 - commandline interface: `--headless` is not supported
diff --git a/build-template/Containerfile b/build-template/Containerfile
index b1a0c48..e47f847 100644
--- a/build-template/Containerfile
+++ b/build-template/Containerfile
@@ -7,12 +7,13 @@ FROM docker.io/ubuntu:focal AS os-base
 # https://docs.godotengine.org/en/stable/contributing/development/compiling/compiling_for_linuxbsd.html
 
 RUN apt-get update
-RUN DEBIAN_FRONTEND=noninteractive apt-get install -yq python3-pip git build-essential pkg-config libx11-dev libxcursor-dev libxinerama-dev libgl1-mesa-dev libglu1-mesa-dev libasound2-dev libpulse-dev libudev-dev libxi-dev libxrandr-dev libwayland-dev
-RUN pip3 install --system scons
+RUN DEBIAN_FRONTEND=noninteractive apt-get install -yq build-essential scons pkg-config libx11-dev libxcursor-dev libxinerama-dev libgl1-mesa-dev libglu1-mesa-dev libasound2-dev libpulse-dev libudev-dev libxi-dev libxrandr-dev libwayland-dev
+
+RUN DEBIAN_FRONTEND=noninteractive apt-get install -yq git
 
 FROM os-base AS clone-src
 
-RUN git clone https://github.com/godotengine/godot.git -b 4.4-stable /godot-src
+RUN git clone https://github.com/godotengine/godot.git -b 4.3-stable /godot-src
 
 FROM clone-src
 
diff --git a/examples/blur.gdshader.uid b/examples/blur.gdshader.uid
deleted file mode 100644
index 3739afe..0000000
--- a/examples/blur.gdshader.uid
+++ /dev/null
@@ -1 +0,0 @@
-uid://cny8dtukv54wt
diff --git a/examples/channel_offset.gdshader.uid b/examples/channel_offset.gdshader.uid
deleted file mode 100644
index 66e7cef..0000000
--- a/examples/channel_offset.gdshader.uid
+++ /dev/null
@@ -1 +0,0 @@
-uid://0efk4fornlg6
diff --git a/examples/color_and_pixelate.gdshader.uid b/examples/color_and_pixelate.gdshader.uid
deleted file mode 100644
index d943067..0000000
--- a/examples/color_and_pixelate.gdshader.uid
+++ /dev/null
@@ -1 +0,0 @@
-uid://gd23hu7ro148
diff --git a/examples/denoise.gdshader.uid b/examples/denoise.gdshader.uid
deleted file mode 100644
index 9337646..0000000
--- a/examples/denoise.gdshader.uid
+++ /dev/null
@@ -1 +0,0 @@
-uid://cbwyneu03fki6
diff --git a/examples/greyscale.gdshader.uid b/examples/greyscale.gdshader.uid
deleted file mode 100644
index b6e1bbd..0000000
--- a/examples/greyscale.gdshader.uid
+++ /dev/null
@@ -1 +0,0 @@
-uid://dvarqolt6es27
diff --git a/examples/kuwahara.gdshader.uid b/examples/kuwahara.gdshader.uid
deleted file mode 100644
index 2e0241a..0000000
--- a/examples/kuwahara.gdshader.uid
+++ /dev/null
@@ -1 +0,0 @@
-uid://cdhyuk7u8kxyk
diff --git a/examples/lowpass.gdshader.uid b/examples/lowpass.gdshader.uid
deleted file mode 100644
index 80b19c7..0000000
--- a/examples/lowpass.gdshader.uid
+++ /dev/null
@@ -1 +0,0 @@
-uid://dn02xsjm1kok8
diff --git a/examples/multistep_distort.gdshader.uid b/examples/multistep_distort.gdshader.uid
deleted file mode 100644
index 22efbc6..0000000
--- a/examples/multistep_distort.gdshader.uid
+++ /dev/null
@@ -1 +0,0 @@
-uid://c17u5jx7a7o81
diff --git a/examples/multistep_pixelsort.gdshader b/examples/multistep_pixelsort.gdshader
deleted file mode 100644
index 21ba1b6..0000000
--- a/examples/multistep_pixelsort.gdshader
+++ /dev/null
@@ -1,20 +0,0 @@
-shader_type canvas_item;
-
-#include "./shaderlib/pixelsort.gdshaderinc"
-
-//!steps 1500
-uniform int STEP;
-
-//!load ./images/mountain.jpg
-
-void fragment() {
-	// pixel sorting works in multiple steps
-	COLOR = pixelsort_step(
-		TEXTURE, UV,
-		DIRECTION_BOTTOM_TO_TOP,
-		COLOR_MODE_OKLCH,
-		{true, false, false},
-		{-INF, .007, -INF},
-		{INF, INF, INF},
-		STEP);
-}
diff --git a/examples/multistep_pixelsort.gdshader.uid b/examples/multistep_pixelsort.gdshader.uid
deleted file mode 100644
index 47eaaf5..0000000
--- a/examples/multistep_pixelsort.gdshader.uid
+++ /dev/null
@@ -1 +0,0 @@
-uid://csk0fg4by651b
diff --git a/examples/oklab.gdshader.uid b/examples/oklab.gdshader.uid
deleted file mode 100644
index 87cef6b..0000000
--- a/examples/oklab.gdshader.uid
+++ /dev/null
@@ -1 +0,0 @@
-uid://cu37y8lc0x83
diff --git a/examples/place_texture.gdshader.uid b/examples/place_texture.gdshader.uid
deleted file mode 100644
index 8ced27b..0000000
--- a/examples/place_texture.gdshader.uid
+++ /dev/null
@@ -1 +0,0 @@
-uid://dybe4t5rbbkc6
diff --git a/examples/project.godot_ b/examples/project.godot_
index 5eff383..bd350d3 100644
--- a/examples/project.godot_
+++ b/examples/project.godot_
@@ -11,5 +11,6 @@ config_version=5
 [application]
 
 config/name="Fragmented Project"
+config/features=PackedStringArray("4.3", "Forward Plus")
 run/main_scene="res://0_empty.tscn"
-config/features=PackedStringArray("4.4", "Forward Plus")
+
diff --git a/examples/sobel.gdshader b/examples/sobel.gdshader
deleted file mode 100644
index 3a7a8b5..0000000
--- a/examples/sobel.gdshader
+++ /dev/null
@@ -1,10 +0,0 @@
-shader_type canvas_item;
-
-//!load ./images/noisy.png
-
-#include "./shaderlib/sobel.gdshaderinc"
-
-void fragment() {
-	// Sobel Filter
-	COLOR = sobel(TEXTURE, UV);
-}
diff --git a/examples/sobel.gdshader.uid b/examples/sobel.gdshader.uid
deleted file mode 100644
index 33b657a..0000000
--- a/examples/sobel.gdshader.uid
+++ /dev/null
@@ -1 +0,0 @@
-uid://h376mk1fq4ky
diff --git a/export_presets.cfg b/export_presets.cfg
index 79a474d..4b10743 100644
--- a/export_presets.cfg
+++ b/export_presets.cfg
@@ -10,10 +10,8 @@ export_filter="all_resources"
 include_filter=""
 exclude_filter="screenshot.png, examples/*, shaderlib/*, tools/*, build-template/*"
 export_path="dist/Fragmented.x86_64"
-patches=PackedStringArray()
 encryption_include_filters=""
 encryption_exclude_filters=""
-seed=0
 encrypt_pck=false
 encrypt_directory=false
 script_export_mode=2
diff --git a/project.godot b/project.godot
index 95da5af..4b605af 100644
--- a/project.godot
+++ b/project.godot
@@ -11,9 +11,10 @@ config_version=5
 [application]
 
 config/name="Fragmented"
-config/version="v10.2"
+config/version="v9.0"
 run/main_scene="res://src/scenes/main.tscn"
-config/features=PackedStringArray("4.4", "Mobile")
+config/features=PackedStringArray("4.3", "Mobile")
+run/low_processor_mode=true
 config/icon="res://src/assets/icon.png"
 
 [autoload]
@@ -27,6 +28,7 @@ window/size/viewport_width=640
 window/size/viewport_height=672
 window/energy_saving/keep_screen_on=false
 window/subwindows/embed_subwindows=false
+window/vsync/vsync_mode=0
 
 [editor_plugins]
 
@@ -70,4 +72,4 @@ renderer/rendering_method="mobile"
 textures/vram_compression/import_etc2_astc=true
 textures/lossless_compression/force_png=true
 shader_compiler/shader_cache/enabled=false
-environment/defaults/default_clear_color=Color(0.501961, 0.501961, 0.501961, 1)
+environment/defaults/default_clear_color=Color(0, 0, 0, 1)
diff --git a/screenshot.png b/screenshot.png
index ce0ac8a..0ba5b66 100644
Binary files a/screenshot.png and b/screenshot.png differ
diff --git a/shaderlib/blur.gdshaderinc.uid b/shaderlib/blur.gdshaderinc.uid
deleted file mode 100644
index d5c8dfd..0000000
--- a/shaderlib/blur.gdshaderinc.uid
+++ /dev/null
@@ -1 +0,0 @@
-uid://bjtljvcjcu6dr
diff --git a/shaderlib/common.gdshaderinc b/shaderlib/common.gdshaderinc
index 9352d6a..8af35dc 100644
--- a/shaderlib/common.gdshaderinc
+++ b/shaderlib/common.gdshaderinc
@@ -13,15 +13,3 @@ vec4 alpha_blend(vec4 b, vec4 a) {
 	vec3 col = ((a.rgb*a.a) + ((b.rgb*b.a) * (1.0 - a.a)) / alpha);
 	return vec4(col.r, col.g, col.b, alpha);
 }
-
-/*
-	Rotate UV
-*/
-
-vec2 rotateUV(vec2 uv, float rotation, vec2 center) {
-	float cosRot = cos(rotation);
-	float sinRot = sin(rotation);
-    return vec2(
-		cosRot * (uv.x - center.x) + sinRot * (uv.y - center.y) + center.x,
-        cosRot * (uv.y - center.y) - sinRot * (uv.x - center.x) + center.y);
-}
diff --git a/shaderlib/common.gdshaderinc.uid b/shaderlib/common.gdshaderinc.uid
deleted file mode 100644
index f43430d..0000000
--- a/shaderlib/common.gdshaderinc.uid
+++ /dev/null
@@ -1 +0,0 @@
-uid://764b6ekchgb8
diff --git a/shaderlib/denoise.gdshaderinc.uid b/shaderlib/denoise.gdshaderinc.uid
deleted file mode 100644
index 132a166..0000000
--- a/shaderlib/denoise.gdshaderinc.uid
+++ /dev/null
@@ -1 +0,0 @@
-uid://b7ksfifyyfcip
diff --git a/shaderlib/hsv.gdshaderinc.uid b/shaderlib/hsv.gdshaderinc.uid
deleted file mode 100644
index 771cc38..0000000
--- a/shaderlib/hsv.gdshaderinc.uid
+++ /dev/null
@@ -1 +0,0 @@
-uid://bbr3tq6mp5qa2
diff --git a/shaderlib/kuwahara.gdshaderinc.uid b/shaderlib/kuwahara.gdshaderinc.uid
deleted file mode 100644
index 1ff911b..0000000
--- a/shaderlib/kuwahara.gdshaderinc.uid
+++ /dev/null
@@ -1 +0,0 @@
-uid://chqh2cni1qiuu
diff --git a/shaderlib/oklab.gdshaderinc b/shaderlib/oklab.gdshaderinc
index 5a456c7..833db27 100644
--- a/shaderlib/oklab.gdshaderinc
+++ b/shaderlib/oklab.gdshaderinc
@@ -12,8 +12,6 @@
 #include "./common.gdshaderinc"
 
 vec4 rgb2oklab(vec4 c) {
-	// oklab.x and .y (a and b) should range from -0.5 to 0.5
-
 	float l = 0.4122214708f * c.r + 0.5363325363f * c.g + 0.0514459929f * c.b;
 	float m = 0.2119034982f * c.r + 0.6806995451f * c.g + 0.1073969566f * c.b;
 	float s = 0.0883024619f * c.r + 0.2817188376f * c.g + 0.6299787005f * c.b;
@@ -31,8 +29,6 @@ vec4 rgb2oklab(vec4 c) {
 }
 
 vec4 oklab2rgb(vec4 c) {
-	// oklab.x and .y (a and b) should range from -0.5 to 0.5
-
 	float l_ = c.x + 0.3963377774f * c.y + 0.2158037573f * c.z;
 	float m_ = c.x - 0.1055613458f * c.y - 0.0638541728f * c.z;
 	float s_ = c.x - 0.0894841775f * c.y - 1.2914855480f * c.z;
@@ -50,7 +46,6 @@ vec4 oklab2rgb(vec4 c) {
 }
 
 vec4 oklab2oklch(vec4 c) {
-	// oklch.z (hue) ranges from -3.6 to 3.6
 	return vec4(
 		c.x,
 		sqrt((c.y * c.y) + (c.z * c.z)),
@@ -60,7 +55,6 @@ vec4 oklab2oklch(vec4 c) {
 }
 
 vec4 oklch2oklab(vec4 c) {
-	// oklch.z (hue) ranges from -3.6 to 3.6
 	return vec4(
 		c.x,
 		c.y * cos(c.z),
diff --git a/shaderlib/oklab.gdshaderinc.uid b/shaderlib/oklab.gdshaderinc.uid
deleted file mode 100644
index 7f0bf5f..0000000
--- a/shaderlib/oklab.gdshaderinc.uid
+++ /dev/null
@@ -1 +0,0 @@
-uid://ckw4nfslk4m6l
diff --git a/shaderlib/pixelate.gdshaderinc.uid b/shaderlib/pixelate.gdshaderinc.uid
deleted file mode 100644
index a0a0d4d..0000000
--- a/shaderlib/pixelate.gdshaderinc.uid
+++ /dev/null
@@ -1 +0,0 @@
-uid://dpu5nneo5bgnq
diff --git a/shaderlib/pixelsort.gdshaderinc b/shaderlib/pixelsort.gdshaderinc
deleted file mode 100644
index 73ed5da..0000000
--- a/shaderlib/pixelsort.gdshaderinc
+++ /dev/null
@@ -1,126 +0,0 @@
-
-/*
-	Pixelsorting using odd-even sort
-
-	I roughly followed https://ciphrd.com/2020/04/08/pixel-sorting-on-shader-using-well-crafted-sorting-filters-glsl/
-	- vector fields aren't implemented, diagonal sorting is not supported!
-*/
-
-#include "./hsv.gdshaderinc"
-#include "./oklab.gdshaderinc"
-
-#define INF (1.0/0.0)
-
-#define DIRECTION_LEFT_TO_RIGHT vec2(1, 0)
-#define DIRECTION_RIGHT_TO_LEFT vec2(-1, 0)
-#define DIRECTION_TOP_TO_BOTTOM vec2(0, 1)
-#define DIRECTION_BOTTOM_TO_TOP vec2(0, -1)
-
-#define COLOR_MODE_RGB 0
-#define COLOR_MODE_OKLAB 1
-#define COLOR_MODE_OKLCH 2
-#define COLOR_MODE_HSV 3
-
-vec4 pixelsort_step(
-	sampler2D tex, vec2 uv,
-	vec2 direction, // e.g. (1, 0) for left-to-right or (0, -1) for bottom-to-top
-	                // see DIRECTION_LEFT_TO_RIGHT, etc.
-	                // note: vertical sorting doesn't work, so using e.g. (1, 1) won't work
-	int color_mode, // 0 = RGB, 1 = OKLAB, 2 = OKLCH, 3 = HSV
-	                // see COLOR_MODE_RGB, etc.
-	bool color_channel_mask[3], // which color channel(s) to take into account
-	float lower_threshold[3],   // lower threshold for pixels to be considered sorted
-	                            // when in doubt, use {-INF, -INF, -INF}
-	float upper_threshold[3],   // upper threshold; {INF, INF, INF}
-	int step_ // from STEP
-) {
-	// sanitize inputs
-	direction = clamp(direction, vec2(-1, -1), vec2(1, 1));
-	color_mode = clamp(color_mode, 0, 3);
-	// get neighbour
-	vec2 texture_size = vec2(textureSize(tex, 0));
-	vec2 a = (mod(floor(uv * texture_size), 2.0) * 2.0 - 1.0) * (mod(float(step_), 2.0) * 2.0 - 1.0);
-	vec2 neighbour_uv = uv + (direction * a / texture_size);
-	//
-	vec4 x = texture(tex, uv);
-	vec4 y = texture(tex, neighbour_uv);
-	if ( // stop at borders
-		neighbour_uv.x > 1.0 ||
-		neighbour_uv.x < 0.0 ||
-		neighbour_uv.y > 1.0 ||
-		neighbour_uv.y < 0.0
-	) {
-		return x;
-	} else {
-		// convert color if necessary
-		// get value to compare
-		float vx = 0.0;
-		float vy = 0.0;
-		vec3 color_x;
-		vec3 color_y;
-		if (color_mode == COLOR_MODE_RGB) {
-			color_x = x.rgb;
-			color_y = y.rgb;
-		} else if (color_mode == COLOR_MODE_OKLAB) {
-			color_x = rgb2oklab(x).rgb;
-			color_y = rgb2oklab(y).rgb;
-		} else if (color_mode == COLOR_MODE_OKLCH) {
-			color_x = oklab2oklch(rgb2oklab(x)).rgb;
-			color_y = oklab2oklch(rgb2oklab(y)).rgb;
-		} else if (color_mode == COLOR_MODE_HSV) {
-			color_x = rgb2hsv(x).rgb;
-			color_y = rgb2hsv(y).rgb;
-		}
-		float divisor = 0.0;
-		if (color_channel_mask[0]) {
-			vx += color_x.r;
-			vy += color_y.r;
-			divisor += 1.0;
-		}
-		if (color_channel_mask[1]) {
-			vx += color_x.g;
-			vy += color_y.g;
-			divisor += 1.0;
-		}
-		if (color_channel_mask[2]) {
-			vx += color_x.b;
-			vy += color_y.b;
-			divisor += 1.0;
-		}
-		divisor = max(divisor, 1.0);
-		vx /= divisor;
-		vy /= divisor;
-		//
-		if (
-			(a.x < .0 && abs(direction).y == .0) ||
-			(a.y < .0 && abs(direction).x == .0)
-		) {
-			if (
-				vy > vx &&
-				// threshold
-				color_x.r < upper_threshold[0] &&
-				color_x.g < upper_threshold[1] &&
-				color_x.b < upper_threshold[2] &&
-				color_x.r > lower_threshold[0] &&
-				color_x.g > lower_threshold[1] &&
-				color_x.b > lower_threshold[2]
-			) { return y; }
-			else { return x; }
-		} else if (
-			(a.x > .0 && abs(direction).y == .0) ||
-			(a.y > .0 && abs(direction).x == .0)
-		) {
-			if (
-				vx >= vy &&
-				// threshold
-				color_y.r < upper_threshold[0] &&
-				color_y.g < upper_threshold[1] &&
-				color_y.b < upper_threshold[2] &&
-				color_y.r > lower_threshold[0] &&
-				color_y.g > lower_threshold[1] &&
-				color_y.b > lower_threshold[2]
-			) { return y; }
-			else { return x; }
-		}
-	}
-}
diff --git a/shaderlib/pixelsort.gdshaderinc.uid b/shaderlib/pixelsort.gdshaderinc.uid
deleted file mode 100644
index e02f48e..0000000
--- a/shaderlib/pixelsort.gdshaderinc.uid
+++ /dev/null
@@ -1 +0,0 @@
-uid://doefnwk3vyr0o
diff --git a/shaderlib/place_texture.gdshaderinc.uid b/shaderlib/place_texture.gdshaderinc.uid
deleted file mode 100644
index f0b6f69..0000000
--- a/shaderlib/place_texture.gdshaderinc.uid
+++ /dev/null
@@ -1 +0,0 @@
-uid://51u2hjq62e5i
diff --git a/shaderlib/sobel.gdshaderinc b/shaderlib/sobel.gdshaderinc
deleted file mode 100644
index dd665b3..0000000
--- a/shaderlib/sobel.gdshaderinc
+++ /dev/null
@@ -1,50 +0,0 @@
-
-/*
-	Edge Detection (Sobel Filter and Gaussian Blur) by FencerDevLog, adapted
-	original code: https://godotshaders.com/shader/edge-detection-sobel-filter-and-gaussian-blur/
-	license of the original code: CC0
-*/
-
-vec3 _convolution(sampler2D tex, vec2 uv, vec2 pixel_size) {
-	vec3 conv = vec3(0.0);
-	// Gaussian blur kernel
-	float gauss[25] = {
-		0.00390625, 0.015625, 0.0234375, 0.015625, 0.00390625,
-		0.015625, 0.0625, 0.09375, 0.0625, 0.015625,
-		0.0234375, 0.09375, 0.140625, 0.09375, 0.0234375,
-		0.015625, 0.0625, 0.09375, 0.0625, 0.015625,
-		0.00390625, 0.015625, 0.0234375, 0.015625, 0.00390625
-	};
-	for (int row = 0; row < 5; row++) {
-		for (int col = 0; col < 5; col++) {
-			conv += texture(tex, uv + vec2(float(col - 2), float(row - 2)) * pixel_size).rgb * gauss[row * 5 + col];
-		}
-	}
-	return conv;
-}
-
-vec4 sobel(sampler2D tex, vec2 uv) {
-	vec2 pixel_size = 1.0/vec2(textureSize(tex, 0));
-	vec3 pixels[9];  // Sobel kernel
-	// [0, 1, 2]
-	// [3, 4, 5]
-	// [6, 7, 8]
-	for (int row = 0; row < 3; row++) {
-		for (int col = 0; col < 3; col++) {
-			vec2 uv_ = uv + vec2(float(col - 1), float(row - 1)) * pixel_size;
-			pixels[row * 3 + col] = _convolution(tex, uv_, pixel_size);
-		}
-	}
-
-	// Sobel operator
-	vec3 gx = (
-		pixels[0] * -1.0 + pixels[3] * -2.0 + pixels[6] * -1.0
-		+ pixels[2] * 1.0 + pixels[5] * 2.0 + pixels[8] * 1.0
-	);
-	vec3 gy = (
-		pixels[0] * -1.0 + pixels[1] * -2.0 + pixels[2] * -1.0
-		+ pixels[6] * 1.0 + pixels[7] * 2.0 + pixels[8] * 1.0
-	);
-	vec3 sobel = sqrt(gx * gx + gy * gy);
-	return vec4(sobel, 1.0);
-}
\ No newline at end of file
diff --git a/shaderlib/sobel.gdshaderinc.uid b/shaderlib/sobel.gdshaderinc.uid
deleted file mode 100644
index 5753e70..0000000
--- a/shaderlib/sobel.gdshaderinc.uid
+++ /dev/null
@@ -1 +0,0 @@
-uid://bqo1fpunnl05f
diff --git a/src/Camera.gd b/src/Camera.gd
index 416e035..9ca1b84 100644
--- a/src/Camera.gd
+++ b/src/Camera.gd
@@ -16,14 +16,6 @@ func _input(event):
 	if self.drag && event is InputEventMouseMotion:
 		self.global_position -= event.relative / self.zoom
 
-var old_zoom = self.zoom
-
-func _process(_delta: float) -> void:
-	if self.zoom != old_zoom:
-		image_viewport_display.update_zoom_texture_filter(self.zoom)
-		image_viewport_display.material.set_shader_parameter("zoom_level", self.zoom)
-		old_zoom = self.zoom
-
 func fit_image():
 	if Filesystem.original_image != null:
 		var image_size = Filesystem.original_image.get_size()
@@ -36,15 +28,21 @@ func fit_image():
 		self.zoom = Vector2(zoomf, zoomf)
 		self.global_position = Vector2(0, 0)
 
+func update_vd_zoomlevel():
+	image_viewport_display.update_zoom_texture_filter(self.zoom)
+	image_viewport_display.material.set_shader_parameter("zoom_level", self.zoom)
+
 func zoom_in():
 	var old_mouse_pos = get_global_mouse_position()
 	self.zoom *= 1.2
 	self.global_position += old_mouse_pos - get_global_mouse_position()
+	update_vd_zoomlevel()
 
 func zoom_out():
 	var old_mouse_pos = get_global_mouse_position()
 	self.zoom *= 1/1.2
 	self.global_position += old_mouse_pos - get_global_mouse_position()
+	update_vd_zoomlevel()
 
 func _on_fit_image_button_pressed():
 	fit_image()
diff --git a/src/Camera.gd.uid b/src/Camera.gd.uid
deleted file mode 100644
index f25b715..0000000
--- a/src/Camera.gd.uid
+++ /dev/null
@@ -1 +0,0 @@
-uid://b6r8rigubdctk
diff --git a/src/Filesystem.gd.uid b/src/Filesystem.gd.uid
deleted file mode 100644
index a89dcab..0000000
--- a/src/Filesystem.gd.uid
+++ /dev/null
@@ -1 +0,0 @@
-uid://rlb041ygdwol
diff --git a/src/ImageCompositor.gd b/src/ImageCompositor.gd
index 9f3e95a..ad1ffb5 100644
--- a/src/ImageCompositor.gd
+++ b/src/ImageCompositor.gd
@@ -37,26 +37,19 @@ func validate_shader_compilation(shader: Shader) -> bool:
 	# test if uniform list is empty -> if it is empty, the shader compilation failed
 	return len(shader.get_shader_uniform_list()) > 0
 
-func shader_has_uniform(shader: Shader, name: String, type: int) -> bool:
+func shader_has_step_uniform(shader: Shader) -> bool:
 	for u in shader.get_shader_uniform_list():
-		if u["name"] == name && u["type"] == type:
+		if u["name"] == "STEP" && u["type"] == 2:
 			return true
 	return false
 
-func set_vsync(enabled: bool):
-	if enabled:
-		DisplayServer.window_set_vsync_mode(DisplayServer.VSYNC_ENABLED)
-	else:
-		DisplayServer.window_set_vsync_mode(DisplayServer.VSYNC_DISABLED)
-
 func update(overwrite_image_path: String = "") -> Array: # returns error messages (strings)
 	var shader = Filesystem.shader # read from disk
 	if shader == null:
 		return ["No shader opened!"]
 	# get number of steps & check if code has STEP uniform
 	var steps: int = ShaderDirectiveParser.parse_steps_directive(shader.code)
-	var has_step_uniform: bool = shader_has_uniform(shader, "STEP", 2)
-	var has_steps_uniform: bool = shader_has_uniform(shader, "STEPS", 2)
+	var has_step_uniform: bool = shader_has_step_uniform(shader)
 	# validate shader
 	if not validate_shader_compilation(shader):
 		return ["Shader compilation failed!"]
@@ -91,9 +84,6 @@ func update(overwrite_image_path: String = "") -> Array: # returns error message
 	image_sprite.texture = Filesystem.original_image
 	image_sprite.offset = Filesystem.original_image.get_size() / 2
 	self.size = Filesystem.original_image.get_size()
-	# already show the image viewport & fit the image
-	if fit_image: camera.fit_image()
-	image_viewport_display.show()
 	# create shader material
 	var mat = ShaderMaterial.new()
 	mat.shader = shader
@@ -105,10 +95,6 @@ func update(overwrite_image_path: String = "") -> Array: # returns error message
 	# assign material
 	image_sprite.material = mat
 	# iterate n times
-	set_vsync(false) # speed up processing
-	if has_steps_uniform:
-		# set STEPS param
-		mat.set_shader_parameter("STEPS", steps)
 	for i in range(steps):
 		if has_step_uniform:
 			# set STEP param
@@ -117,7 +103,10 @@ func update(overwrite_image_path: String = "") -> Array: # returns error message
 		await RenderingServer.frame_post_draw # wait for next frame to get drawn
 		Filesystem.result = get_texture().get_image()
 		image_sprite.texture = ImageTexture.create_from_image(Filesystem.result)
-	set_vsync(true) # reenable vsync
 	image_sprite.material = null
+	if fit_image:
+		camera.fit_image()
+	camera.update_vd_zoomlevel()
+	image_viewport_display.show()
 	# done
 	return errors
diff --git a/src/ImageCompositor.gd.uid b/src/ImageCompositor.gd.uid
deleted file mode 100644
index 2e55fae..0000000
--- a/src/ImageCompositor.gd.uid
+++ /dev/null
@@ -1 +0,0 @@
-uid://d106170kuigl3
diff --git a/src/ImageViewportDisplay.gd.uid b/src/ImageViewportDisplay.gd.uid
deleted file mode 100644
index dbde761..0000000
--- a/src/ImageViewportDisplay.gd.uid
+++ /dev/null
@@ -1 +0,0 @@
-uid://ctc4lhbdsoq7u
diff --git a/src/Main.gd.uid b/src/Main.gd.uid
deleted file mode 100644
index 2f9a508..0000000
--- a/src/Main.gd.uid
+++ /dev/null
@@ -1 +0,0 @@
-uid://5sbslwysin5a
diff --git a/src/MainUI.gd b/src/MainUI.gd
index 8a62ff1..3727f08 100644
--- a/src/MainUI.gd
+++ b/src/MainUI.gd
@@ -72,7 +72,6 @@ func _on_open_shader_dialog_confirmed() -> void:
 
 func _on_save_image_dialog_file_selected(path):
 	Filesystem.save_result(path)
-	set_buttons_disabled(false)
 
 func _on_save_image_dialog_canceled() -> void:
 	set_buttons_disabled(false)
diff --git a/src/MainUI.gd.uid b/src/MainUI.gd.uid
deleted file mode 100644
index 0077ccd..0000000
--- a/src/MainUI.gd.uid
+++ /dev/null
@@ -1 +0,0 @@
-uid://bxgmf2ny7yuc8
diff --git a/src/ShaderDirectiveParser.gd.uid b/src/ShaderDirectiveParser.gd.uid
deleted file mode 100644
index 59f7f0e..0000000
--- a/src/ShaderDirectiveParser.gd.uid
+++ /dev/null
@@ -1 +0,0 @@
-uid://dw8bep14j4j3w
diff --git a/src/VersionLabel.gd.uid b/src/VersionLabel.gd.uid
deleted file mode 100644
index e731c41..0000000
--- a/src/VersionLabel.gd.uid
+++ /dev/null
@@ -1 +0,0 @@
-uid://bh0gpu3i2p47f
diff --git a/src/assets/bg.png b/src/assets/bg.png
deleted file mode 100644
index fb67c19..0000000
Binary files a/src/assets/bg.png and /dev/null differ
diff --git a/src/assets/bg.png.import b/src/assets/bg.png.import
deleted file mode 100644
index e61ed86..0000000
--- a/src/assets/bg.png.import
+++ /dev/null
@@ -1,34 +0,0 @@
-[remap]
-
-importer="texture"
-type="CompressedTexture2D"
-uid="uid://d2nwchyd6huob"
-path="res://.godot/imported/bg.png-7c8713dd1fab321784216191fa747e53.ctex"
-metadata={
-"vram_texture": false
-}
-
-[deps]
-
-source_file="res://src/assets/bg.png"
-dest_files=["res://.godot/imported/bg.png-7c8713dd1fab321784216191fa747e53.ctex"]
-
-[params]
-
-compress/mode=0
-compress/high_quality=false
-compress/lossy_quality=0.7
-compress/hdr_compression=1
-compress/normal_map=0
-compress/channel_pack=0
-mipmaps/generate=false
-mipmaps/limit=-1
-roughness/mode=0
-roughness/src_normal=""
-process/fix_alpha_border=true
-process/premult_alpha=false
-process/normal_map_invert_y=false
-process/hdr_as_srgb=false
-process/hdr_clamp_exposure=false
-process/size_limit=0
-detect_3d/compress_to=1
diff --git a/src/scenes/main.tscn b/src/scenes/main.tscn
index 14b19bd..e6580b3 100644
--- a/src/scenes/main.tscn
+++ b/src/scenes/main.tscn
@@ -1,14 +1,13 @@
-[gd_scene load_steps=13 format=3 uid="uid://bjah7k4bxo044"]
+[gd_scene load_steps=12 format=3 uid="uid://bjah7k4bxo044"]
 
-[ext_resource type="Script" uid="uid://5sbslwysin5a" path="res://src/Main.gd" id="1_64y3g"]
-[ext_resource type="Script" uid="uid://d106170kuigl3" path="res://src/ImageCompositor.gd" id="2_4ykh7"]
-[ext_resource type="Shader" uid="uid://ctk7jomfyx0fh" path="res://src/shader/ivd_outline.gdshader" id="3_0fllm"]
-[ext_resource type="Script" uid="uid://ctc4lhbdsoq7u" path="res://src/ImageViewportDisplay.gd" id="4_pbpx2"]
-[ext_resource type="Script" uid="uid://b6r8rigubdctk" path="res://src/Camera.gd" id="5_hkdq6"]
-[ext_resource type="Texture2D" uid="uid://d2nwchyd6huob" path="res://src/assets/bg.png" id="6_kokaf"]
+[ext_resource type="Script" uid="uid://n6vumf2emghl" path="res://src/Main.gd" id="1_64y3g"]
+[ext_resource type="Script" path="res://src/ImageCompositor.gd" id="2_4ykh7"]
+[ext_resource type="Shader" uid="uid://on6oju7dt0dj" path="res://src/shader/ivd_outline.gdshader" id="3_0fllm"]
+[ext_resource type="Script" uid="uid://c51lc0hv2d7uq" path="res://src/ImageViewportDisplay.gd" id="4_pbpx2"]
+[ext_resource type="Script" uid="uid://t71vu44i5cr5" path="res://src/Camera.gd" id="5_hkdq6"]
 [ext_resource type="Theme" uid="uid://cwqlns34rj3vx" path="res://src/theme.tres" id="6_rjp5f"]
-[ext_resource type="Script" uid="uid://bxgmf2ny7yuc8" path="res://src/MainUI.gd" id="7_5puhk"]
-[ext_resource type="Script" uid="uid://bh0gpu3i2p47f" path="res://src/VersionLabel.gd" id="8_kod8x"]
+[ext_resource type="Script" uid="uid://e5gf0r42elmx" path="res://src/MainUI.gd" id="7_5puhk"]
+[ext_resource type="Script" uid="uid://b254xv4j2uexg" path="res://src/VersionLabel.gd" id="8_kod8x"]
 
 [sub_resource type="ShaderMaterial" id="ShaderMaterial_y2ea0"]
 shader = ExtResource("3_0fllm")
@@ -19,6 +18,7 @@ viewport_path = NodePath("Compositor")
 
 [sub_resource type="LabelSettings" id="LabelSettings_6o860"]
 font_size = 12
+font_color = Color(1, 1, 1, 0.509804)
 shadow_color = Color(0, 0, 0, 1)
 
 [node name="Main" type="Node2D"]
@@ -39,27 +39,6 @@ unique_name_in_owner = true
 offset = Vector2(0, -64)
 script = ExtResource("5_hkdq6")
 
-[node name="CanvasLayerBg" type="CanvasLayer" parent="."]
-layer = -1
-
-[node name="Control" type="Control" parent="CanvasLayerBg"]
-layout_mode = 3
-anchors_preset = 15
-anchor_right = 1.0
-anchor_bottom = 1.0
-grow_horizontal = 2
-grow_vertical = 2
-
-[node name="TextureRect" type="TextureRect" parent="CanvasLayerBg/Control"]
-layout_mode = 1
-anchors_preset = 15
-anchor_right = 1.0
-anchor_bottom = 1.0
-grow_horizontal = 2
-grow_vertical = 2
-texture = ExtResource("6_kokaf")
-stretch_mode = 1
-
 [node name="CanvasLayer" type="CanvasLayer" parent="."]
 
 [node name="MainUI" type="Control" parent="CanvasLayer"]
@@ -91,6 +70,7 @@ unique_name_in_owner = true
 auto_translate_mode = 1
 title = "Export Image"
 size = Vector2i(661, 175)
+ok_button_text = "Save"
 mode_overrides_title = false
 access = 2
 filters = PackedStringArray("*.png")
diff --git a/src/shader/ivd_outline.gdshader b/src/shader/ivd_outline.gdshader
index 78bfe77..14ce6e0 100644
--- a/src/shader/ivd_outline.gdshader
+++ b/src/shader/ivd_outline.gdshader
@@ -11,6 +11,6 @@ void fragment() {
 		UV.x > 1.0-t.x ||
 		UV.y > 1.0-t.y
 	) {
-		COLOR = mix(COLOR, vec4(0.5), 0.5);
+		COLOR = mix(COLOR, vec4(1.0), 0.5);
 	}
 }
diff --git a/src/shader/ivd_outline.gdshader.uid b/src/shader/ivd_outline.gdshader.uid
deleted file mode 100644
index b42ac31..0000000
--- a/src/shader/ivd_outline.gdshader.uid
+++ /dev/null
@@ -1 +0,0 @@
-uid://ctk7jomfyx0fh
diff --git a/tools/get_version.gd.uid b/tools/get_version.gd.uid
deleted file mode 100644
index e14829d..0000000
--- a/tools/get_version.gd.uid
+++ /dev/null
@@ -1 +0,0 @@
-uid://cdhqbascy6pvy