From 9905e957e584884886b48b8e39279308e7168cea Mon Sep 17 00:00:00 2001
From: Rob Kelly <contact@robkel.ly>
Date: Tue, 2 Sep 2025 23:38:06 -0600
Subject: [PATCH] Put a little fresnel on that bad boy!

---
 assets/materials/gunk_overlay.material       | Bin 866 -> 870 bytes
 assets/npc/shambler/shambler.material        | Bin 1088 -> 1132 bytes
 src/shaders/gunk.gdshader                    |   9 ++++++++-
 src/world/grunk_beast/grunk_beast.tscn       |   8 ++++----
 src/world/grunk_beast/shambler/shambler.tscn |   4 ++--
 5 files changed, 14 insertions(+), 7 deletions(-)

diff --git a/assets/materials/gunk_overlay.material b/assets/materials/gunk_overlay.material
index 3d0402344aa534d16e4ab0026de02f86e025125f..3faa282af354ea5bd68a1633eb372a5e48a93fa9 100644
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diff --git a/assets/npc/shambler/shambler.material b/assets/npc/shambler/shambler.material
index 147cf184eea5768d624968ed303fedcec25366fb..045c4700f46ee65bc7ad53ba990b9d210c596140 100644
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diff --git a/src/shaders/gunk.gdshader b/src/shaders/gunk.gdshader
index 6bdf0a8..abd0d6b 100644
--- a/src/shaders/gunk.gdshader
+++ b/src/shaders/gunk.gdshader
@@ -5,6 +5,7 @@ group_uniforms gunk_material;
 uniform vec3 color_1: source_color = vec3(0.0, 0.03, 0.1);
 uniform vec3 color_2: source_color = vec3(0.0, 0.1, 0.3);
 uniform vec3 emission_color: source_color = vec3(0.25, 0.88, 1.0);
+uniform vec3 fresnel_color: source_color = vec3(0.25, 0.88, 1.0);
 
 uniform float pixellation = 128.0;
 uniform float time_pixellation = 30.0;
@@ -13,6 +14,8 @@ uniform float roughness: hint_range(0.0, 1.0) = 0.15;
 uniform float specular_contribution = 0.8;
 uniform float emission_strength = 0.05;
 uniform float normal_scale = 1.0;
+uniform float fresnel_amount = 4.0;
+uniform float fresnel_intensity = 0.0;
 
 // Used ONLY by the gunk, does not affect the gunk mask.
 uniform vec2 uv_scale = vec2(1.0);
@@ -48,6 +51,10 @@ void vertex() {
 	VERTEX *= 1.0 + jitter;
 }
 
+vec3 fresnel_glow(vec3 normal, vec3 view) {
+	return pow((1.0 - dot(normalize(normal), normalize(view))), fresnel_amount) * fresnel_color * fresnel_intensity;
+}
+
 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;
@@ -73,7 +80,7 @@ void fragment() {
 	vec4 overlay_em = texture(overlay_emission, UV);
 	emission = mix(emission, overlay_em.rgb * overlay_emission_scale, overlay_em.a);
 
-	ALBEDO = color.rgb;
+	ALBEDO = color.rgb + fresnel_glow(NORMAL, VIEW);
 	ROUGHNESS = value * roughness;
 	EMISSION = emission;
 	SPECULAR = 0.5 * inversesqrt(specular_contribution);
diff --git a/src/world/grunk_beast/grunk_beast.tscn b/src/world/grunk_beast/grunk_beast.tscn
index 9dddbf4..2c743c2 100644
--- a/src/world/grunk_beast/grunk_beast.tscn
+++ b/src/world/grunk_beast/grunk_beast.tscn
@@ -55,13 +55,13 @@ script = ExtResource("2_qqnhb")
 
 [node name="FrameSkipper" type="Node3D" parent="."]
 script = ExtResource("2_lak6w")
-frame_skip = 3
+frame_skip = 2
 
 [node name="Shambler" parent="FrameSkipper" instance=ExtResource("2_csisu")]
 unique_name_in_owner = true
 transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, -1, 0)
 visible = false
-time_scale_factor = 3.0
+time_scale_factor = 2.0
 
 [node name="CollisionShape3D" type="CollisionShape3D" parent="."]
 shape = SubResource("CapsuleShape3D_faau1")
@@ -220,7 +220,7 @@ metadata/_custom_type_script = "uid://om57w2acvgb7"
 script = ExtResource("11_mbqcc")
 mean_time = 4.0
 st_dev_time = 0.6
-wait_time = 3.05189
+wait_time = 4.06128
 metadata/_custom_type_script = "uid://beyk2xtbjrsg4"
 
 [node name="RandomStalkingBehavior" type="Node" parent="GrunkBeastBehavior/StateSelector/StalkingSequence/RandomDelay"]
@@ -266,7 +266,7 @@ metadata/_custom_type_script = "uid://cg016dbe7gs1x"
 script = ExtResource("11_mbqcc")
 mean_time = 5.0
 st_dev_time = 1.0
-wait_time = 4.86324
+wait_time = 4.52556
 metadata/_custom_type_script = "uid://beyk2xtbjrsg4"
 
 [node name="PickRandomLurkTarget" type="Node" parent="GrunkBeastBehavior/StateSelector/LurkSequence/RandomDelay"]
diff --git a/src/world/grunk_beast/shambler/shambler.tscn b/src/world/grunk_beast/shambler/shambler.tscn
index fbbfb55..f47a35c 100644
--- a/src/world/grunk_beast/shambler/shambler.tscn
+++ b/src/world/grunk_beast/shambler/shambler.tscn
@@ -129,7 +129,7 @@ primary_limit_angle = 1.5708
 primary_damp_threshold = 0.7
 
 [node name="SleeveL" type="BoneAttachment3D" parent="Armature/Skeleton3D" index="2"]
-transform = Transform3D(0.0438309, -2.98023e-08, -0.999039, -0.998162, -0.0418897, -0.0437925, -0.0418495, 0.999122, -0.00183608, 0.214327, -0.0756478, -0.79725)
+transform = Transform3D(0.043831, 1.41561e-07, -0.999039, 0.999039, 9.59262e-08, 0.0438309, 3.1665e-08, -1, -1.11759e-07, 1.63061, 0.0124229, 0.803843)
 bone_name = "Sleeve.L"
 bone_idx = 27
 
@@ -140,7 +140,7 @@ particle_scene = ExtResource("5_lqi3b")
 metadata/_custom_type_script = "uid://cuqr167olan8n"
 
 [node name="SleeveR" type="BoneAttachment3D" parent="Armature/Skeleton3D" index="3"]
-transform = Transform3D(0.0438309, 2.98023e-08, 0.999039, 0.998162, -0.0418897, -0.0437925, 0.0418495, 0.999122, -0.00183608, -0.214327, -0.0756484, -0.79725)
+transform = Transform3D(0.043831, -1.41561e-07, 0.999039, -0.999039, 9.59262e-08, 0.0438309, -3.1665e-08, -1, -1.11759e-07, -1.63061, 0.0124235, 0.803843)
 bone_name = "Sleeve.R"
 bone_idx = 31