Improved gunk material

assets/debug_mask.png.import

@@ -0,0 +1,35 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://8cm835h4gxwe"
+path.s3tc="res://.godot/imported/debug_mask.png-fd2bc783338ed9439fe81a4eef9d86da.s3tc.ctex"
+metadata={
+"imported_formats": ["s3tc_bptc"],
+"vram_texture": true
+}
+
+[deps]
+
+source_file="res://assets/debug_mask.png"
+dest_files=["res://.godot/imported/debug_mask.png-fd2bc783338ed9439fe81a4eef9d86da.s3tc.ctex"]
+
+[params]
+
+compress/mode=2
+compress/high_quality=false
+compress/lossy_quality=0.7
+compress/hdr_compression=1
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=true
+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=0

assets/materials/gunk_material.tres

@@ -0,0 +1,31 @@
+[gd_resource type="ShaderMaterial" load_steps=6 format=3 uid="uid://kkyg6jrp3d53"]
+
+[ext_resource type="Shader" path="res://src/shaders/gunk.gdshader" id="1_euy6e"]
+[ext_resource type="FastNoiseLite" uid="uid://cnlvdtx68giv6" path="res://assets/materials/gunk_noise.tres" id="2_u4cba"]
+
+[sub_resource type="CompressedTexture2D" id="CompressedTexture2D_ow0bp"]
+load_path = "res://.godot/imported/debug_mask.png-fd2bc783338ed9439fe81a4eef9d86da.s3tc.ctex"
+
+[sub_resource type="NoiseTexture2D" id="NoiseTexture2D_txccq"]
+seamless = true
+noise = ExtResource("2_u4cba")
+
+[sub_resource type="NoiseTexture2D" id="NoiseTexture2D_yr68k"]
+invert = true
+seamless = true
+as_normal_map = true
+bump_strength = 32.0
+noise = ExtResource("2_u4cba")
+
+[resource]
+render_priority = 0
+shader = ExtResource("1_euy6e")
+shader_parameter/color_1 = Color(0, 0.03, 0.1, 1)
+shader_parameter/color_2 = Color(0, 0.1, 0.3, 1)
+shader_parameter/roughness = 0.15
+shader_parameter/specular_contribution = 0.2
+shader_parameter/uv_scale = Vector2(8, 8)
+shader_parameter/edge_bleed = 0.1
+shader_parameter/gunk_mask = SubResource("CompressedTexture2D_ow0bp")
+shader_parameter/gunk_noise = SubResource("NoiseTexture2D_txccq")
+shader_parameter/gunk_normal_map = SubResource("NoiseTexture2D_yr68k")

assets/materials/gunk_noise.tres

@@ -0,0 +1,8 @@
+[gd_resource type="FastNoiseLite" format=3 uid="uid://cnlvdtx68giv6"]
+
+[resource]
+frequency = 0.0025
+fractal_type = 2
+fractal_octaves = 4
+fractal_gain = 0.667
+domain_warp_type = 2

levels/sandbox/debug_gunk_mat.tres

@@ -1,34 +1,7 @@
-[gd_resource type="StandardMaterial3D" load_steps=8 format=3 uid="uid://byyjoruj8mwe0"]
+[gd_resource type="StandardMaterial3D" load_steps=2 format=3 uid="uid://byyjoruj8mwe0"]
 
-[ext_resource type="Shader" path="res://src/shaders/gunk.gdshader" id="1_dot5s"]
+[ext_resource type="Material" uid="uid://kkyg6jrp3d53" path="res://assets/materials/gunk_material.tres" id="1_8bovt"]
-
-[sub_resource type="PlaceholderTexture2D" id="PlaceholderTexture2D_pinpy"]
-size = Vector2(256, 256)
-
-[sub_resource type="FastNoiseLite" id="FastNoiseLite_f8h21"]
-
-[sub_resource type="NoiseTexture2D" id="NoiseTexture2D_dj5ow"]
-seamless = true
-noise = SubResource("FastNoiseLite_f8h21")
-
-[sub_resource type="FastNoiseLite" id="FastNoiseLite_1ennl"]
-
-[sub_resource type="NoiseTexture2D" id="NoiseTexture2D_kkru7"]
-seamless = true
-as_normal_map = true
-noise = SubResource("FastNoiseLite_1ennl")
-
-[sub_resource type="ShaderMaterial" id="ShaderMaterial_0jkcp"]
-render_priority = 0
-shader = ExtResource("1_dot5s")
-shader_parameter/color_1 = Color(0, 0.03, 0.1, 1)
-shader_parameter/color_2 = Color(0, 0.1, 0.3, 1)
-shader_parameter/roughness = 0.15
-shader_parameter/specular_contribution = 0.2
-shader_parameter/gunk_mask = SubResource("PlaceholderTexture2D_pinpy")
-shader_parameter/gunk_noise = SubResource("NoiseTexture2D_dj5ow")
-shader_parameter/gunk_normal_map = SubResource("NoiseTexture2D_kkru7")
 
 [resource]
-next_pass = SubResource("ShaderMaterial_0jkcp")
+next_pass = ExtResource("1_8bovt")
 albedo_color = Color(1, 0.403922, 1, 1)

src/shaders/gunk.gdshader

@@ -6,20 +6,47 @@ uniform vec4 color_2: source_color = vec4(0.0, 0.1, 0.3, 1.0);
 uniform float roughness: hint_range(0.0, 1.0) = 0.15;
 uniform float specular_contribution = 0.2;
 
+// Used ONLY by the gunk, does not affect the gunk mask.
+uniform vec2 uv_scale = vec2(1.0);
+
+uniform float edge_bleed = 0.1;
+
 uniform sampler2D gunk_mask;
 
 uniform highp sampler2D gunk_noise;
 uniform highp sampler2D gunk_normal_map;
 
 
+float hardstep(float value) {
+	float x = clamp(value, 0.0, 1.0);
+	return 0.5 * tanh( (20.0 * x - 10.0) * inversesqrt(x - x * x) ) + 0.5;
+}
+
 void fragment() {
-	float value = texture(gunk_noise, UV).r;
+	vec2 local_uv = UV * uv_scale;
+	float value = texture(gunk_noise, local_uv).r;
 	vec4 color = mix(color_1, color_2, value);
 	float roughness_mix = value * roughness;
 
 	ALBEDO = color.rgb;
 	ROUGHNESS = roughness_mix;
 	SPECULAR = 0.5 * inversesqrt(specular_contribution);
-	NORMAL_MAP = texture(gunk_normal_map, UV).xyz;
+	NORMAL_MAP = texture(gunk_normal_map, local_uv).xyz;
-	ALPHA = 1.0 - texture(gunk_mask, UV).r;
+
+	float mask = texture(gunk_mask, UV).r;
+
+	// soften edges
+	NORMAL_MAP *= smoothstep(1.0, 0.0, mask);
+
+	/*
+	// Hard edge
+	if(mask + edge_bleed < 0.5) {
+		ALPHA = 1.0;
+	} else {
+		ALPHA = 0.0;
+	}
+	*/
+
+	// Hardish edge
+	ALPHA = hardstep(1.0 - mask + edge_bleed);
 }