work on glass effect

app/content/system/house/mini/mini_wall_shader.gdshader

@@ -1,11 +1,14 @@
 shader_type spatial;
-render_mode blend_mix, depth_draw_opaque, cull_disabled, diffuse_lambert, specular_schlick_ggx, unshaded;
+render_mode blend_mix, depth_draw_opaque, cull_disabled, diffuse_burley, specular_schlick_ggx, shadows_disabled;
 
 uniform vec4 data[100];
 uniform int data_size: hint_range(0, 100, 1);
 uniform float alpha: hint_range(0.0, 1.0, 0.1) = 0.3;
 uniform sampler2D color_gradient;
 
+uniform float roughness : hint_range(0.0, 1.0) = 0.15;
+uniform vec4 edge_color : source_color = vec4(0.0, 0.0, 0.0, 1.0);
+
 varying vec3 color;
 
 float simple_weight(int index, vec3 world_pos, float p) {
@@ -17,6 +20,12 @@ float sphere_weight(int index, vec3 world_pos, float r) {
 	return pow(max(0, r - dist) / (r * dist), 2);
 }
 
+float SchlickFresnel(float u) {
+	float m = 1.0 - u;
+	float m2 = m * m;
+	return m2 * m2 * m;
+}
+
 void vertex() {
 	color = vec3(1.0, 1.0, 1.0);
 	
@@ -60,4 +69,14 @@ void vertex() {
 void fragment() {
 	ALBEDO = vec3(color.xyz);
 	ALPHA = alpha;
+	
+	float VdotN = dot(VIEW, NORMAL);
+	float fresnel = clamp(SchlickFresnel(VdotN), 0.0, 1.0);
+	
+	// apply glass look
+	float a = mix(0.001, 1.0, ALPHA);
+	ALPHA = mix(fresnel * edge_color.a, 1.0, a);
+	ALBEDO = mix(edge_color.rgb * edge_color.a, ALBEDO, a);
+	ROUGHNESS = roughness;
+	SPECULAR = 0.5 * inversesqrt(ALPHA);
 }

app/content/ui/glass.gdshader

@@ -1,6 +1,6 @@
 shader_type spatial;
 
-render_mode unshaded, cull_disabled;
+render_mode diffuse_burley, specular_schlick_ggx, blend_mix, cull_disabled, shadows_disabled;
 
 uniform vec4 color : source_color = vec4(1.0, 1.0, 1.0, 1.0);
 uniform vec4 border_color : source_color = vec4(1.0, 1.0, 1.0, 1.0);
@@ -10,6 +10,9 @@ uniform float border_fade_in: hint_range(0.0, 10.0) = 0.0;
 uniform float border_fade_out: hint_range(0.0, 10.0) = 0.0;
 uniform float corner_radius = 0.0;
 
+uniform float roughness : hint_range(0.0, 1.0) = 0.15;
+uniform vec4 edge_color : source_color = vec4(0.0, 0.0, 0.0, 1.0);
+
 uniform float grain_amount : hint_range(0.0, 1.0) = 0.05;
 
 
@@ -20,7 +23,17 @@ float rectangle(vec2 position) {
     return outsideDistance + insideDistance;
 }
 
+float SchlickFresnel(float u) {
+	float m = 1.0 - u;
+	float m2 = m * m;
+	return m2 * m2 * m;
+}
+
 void fragment() {
+	
+	float VdotN = dot(VIEW, NORMAL);
+	float fresnel = clamp(SchlickFresnel(VdotN), 0.0, 1.0);
+	
 	ALBEDO = border_color.xyz;
 	ALPHA = 0.0;
 	float border_scale = 1.0 + 2.0 * corner_radius;
@@ -42,6 +55,13 @@ void fragment() {
 		ALPHA = color.w;
 	}
 	
+	float a = mix(0.001, 1.0, ALPHA);
+	ALPHA = mix(fresnel * edge_color.a, 1.0, a);
+	ALBEDO = mix(edge_color.rgb * edge_color.a, ALBEDO.rgb, a);
+	
+	ROUGHNESS = roughness;
+	SPECULAR = 0.5 * inversesqrt(ALPHA);
+	
 	float noise = (fract(sin(dot(UV, vec2(12.9898, 78.233))) * 43758.5453) - 0.5) * 2.0;
 
     // Add noise to the original color

app/content/ui/glass2.gdshader

@@ -0,0 +1,46 @@
+shader_type spatial;
+render_mode diffuse_burley, specular_schlick_ggx, blend_mix;
+
+group_uniforms albedo;
+uniform vec4 albedo : source_color = vec4(1.0, 1.0, 1.0, 0.0);
+uniform sampler2D albedo_texture : source_color, hint_default_white;
+
+group_uniforms roughness;
+uniform float roughness : hint_range(0.0, 1.0) = 0.15;
+uniform sampler2D roughness_texture : hint_roughness_r;
+
+group_uniforms normal;
+uniform float normal_strength : hint_range(-16.0, 16.0) = 1.0;
+uniform sampler2D normal_map : hint_normal;
+
+group_uniforms misc;
+uniform vec4 edge_color : source_color = vec4(0.0, 0.0, 0.0, 1.0);
+
+float SchlickFresnel(float u) {
+	float m = 1.0 - u;
+	float m2 = m * m;
+	return m2 * m2 * m;
+}
+
+void fragment() {
+	// calculate fresnel values
+	float VdotN = dot(VIEW, NORMAL);
+	float fresnel = clamp(SchlickFresnel(VdotN), 0.0, 1.0);
+	
+	// sample and mix textures
+	vec4 _albedo = texture(albedo_texture, UV) * albedo;
+	float _roughness = texture(roughness_texture, UV).r * roughness;
+	
+	// apply glass look
+	float a = mix(0.001, 1.0, _albedo.a);
+	ALPHA = mix(fresnel * edge_color.a, 1.0, a);
+	ALBEDO = mix(edge_color.rgb * edge_color.a, _albedo.rgb, a);
+	
+	ROUGHNESS = _roughness;
+	NORMAL_MAP = texture(normal_map, UV).xyz;
+	NORMAL_MAP_DEPTH = normal_strength;
+	
+	// function to compensate specular for alpha blend
+	// 0.5 * ALPHA^-0.5
+	SPECULAR = 0.5 * inversesqrt(ALPHA);
+}

app/content/ui/test.material

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:ca6bc1d679f5e116431fb17104d1bcb1083ca0b5e834c20bd5008dbaa7c3b79a
-size 413
+oid sha256:6041f48bfc2a4bc4c88096265fb3baf46881eec9a244104378c98a6c5e0dbb9a
+size 442

app/content/ui/test.tscn

@@ -1,9 +1,10 @@
-[gd_scene load_steps=7 format=3 uid="uid://dclceqjqfxekx"]
+[gd_scene load_steps=10 format=3 uid="uid://dclceqjqfxekx"]
 
 [ext_resource type="Script" path="res://content/ui/test.gd" id="1_jevji"]
 [ext_resource type="Material" uid="uid://dy5bbwaceset8" path="res://content/ui/test.material" id="2_fswvt"]
 [ext_resource type="PackedScene" uid="uid://pk5k1q8bx0rj" path="res://content/ui/components/slider/slider.tscn" id="3_f40pk"]
 [ext_resource type="Script" path="res://content/functions/movable.gd" id="4_qjv7o"]
+[ext_resource type="Shader" path="res://content/ui/glass2.gdshader" id="5_yedor"]
 
 [sub_resource type="BoxShape3D" id="BoxShape3D_ptbst"]
 size = Vector3(2, 1, 0.1)
@@ -11,9 +12,24 @@ size = Vector3(2, 1, 0.1)
 [sub_resource type="QuadMesh" id="QuadMesh_4253w"]
 size = Vector2(0.8, 0.5)
 
+[sub_resource type="ShaderMaterial" id="ShaderMaterial_tiql8"]
+render_priority = 0
+shader = ExtResource("5_yedor")
+shader_parameter/albedo = Color(1, 1, 1, 0.388235)
+shader_parameter/roughness = 0.15
+shader_parameter/normal_strength = 1.0
+shader_parameter/edge_color = Color(0, 0, 0, 1)
+
+[sub_resource type="QuadMesh" id="QuadMesh_g82c4"]
+size = Vector2(1, 0.5)
+
 [node name="Test" type="Node3D"]
 script = ExtResource("1_jevji")
 
+[node name="DirectionalLight3D" type="DirectionalLight3D" parent="."]
+transform = Transform3D(-0.866023, -0.433016, 0.250001, 0.470665, -0.53724, 0.699892, -0.168754, 0.723789, 0.669068, 0.677175, 0.464924, 0.836006)
+shadow_enabled = true
+
 [node name="StaticBody3D" type="StaticBody3D" parent="."]
 
 [node name="CollisionShape3D" type="CollisionShape3D" parent="StaticBody3D"]
@@ -64,3 +80,10 @@ value = 0.0
 
 [node name="Movable" type="Node" parent="StaticBody3D"]
 script = ExtResource("4_qjv7o")
+
+[node name="MeshInstance3D3" type="MeshInstance3D" parent="StaticBody3D"]
+transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0.0121959)
+visible = false
+material_override = SubResource("ShaderMaterial_tiql8")
+mesh = SubResource("QuadMesh_g82c4")
+skeleton = NodePath("../..")