Adding zabr to sky shader

maps/basic_setup.tscn

@@ -1,9 +1,10 @@
-[gd_scene load_steps=22 format=3 uid="uid://b8p2h0rmwy7qn"]
+[gd_scene load_steps=23 format=3 uid="uid://b8p2h0rmwy7qn"]
 
 [ext_resource type="Material" uid="uid://dpegsmygxcfmv" path="res://maps/materials/basic_ground.material" id="1_lodye"]
 [ext_resource type="Shader" path="res://maps/shaders/khanat_sky.gdshader" id="1_mheqi"]
 [ext_resource type="Texture2D" uid="uid://b5jer2nm17ld" path="res://maps/textures/samayun_tex_001.png" id="1_thm7k"]
 [ext_resource type="PackedScene" uid="uid://cveshwnu272vf" path="res://maps/objects/ramp-complex.tscn" id="2_4eueh"]
+[ext_resource type="Texture2D" uid="uid://y0ka7tysfp6b" path="res://maps/textures/zabr_tex_001.png" id="3_bgghj"]
 [ext_resource type="PackedScene" uid="uid://omess6wwwwcq" path="res://maps/objects/ramp-moving.tscn" id="3_bvbgo"]
 [ext_resource type="PackedScene" uid="uid://dvsl8x3lb1h4e" path="res://maps/objects/moutain.tscn" id="3_rbp35"]
 [ext_resource type="PackedScene" path="res://maps/objects/cave.tscn" id="4_pc85h"]
@@ -29,9 +30,12 @@ shader_param/sun_disk_scale = 1.0
 shader_param/ground_color = Color(0.1, 0.07, 0.034, 1)
 shader_param/exposure = 0.1
 shader_param/dither_strength = 1.0
-shader_param/samayun_scale = 0.201
+shader_param/samayun_arc = 25.0
-shader_param/samayun_position = Vector3(1.269, 0.931, -0.345)
+shader_param/samayun_position = Vector3(2.038, 0.584, -0.185)
+shader_param/zabr_arc = null
+shader_param/zabr_position = Vector3(0.812, 0.345, 0.263)
 shader_param/samayun = ExtResource( "1_thm7k" )
+shader_param/zabr = ExtResource( "3_bgghj" )
 
 [sub_resource type="Sky" id="Sky_fa16p"]
 sky_material = SubResource( "ShaderMaterial_s2q0l" )

maps/shaders/khanat_sky.gdshader

@@ -1,5 +1,6 @@
 
 // NOTE: Shader automatically converted from Godot Engine 4.0.alpha5's PhysicalSkyMaterial.
+// And then augmented with a few tweaks
 
 shader_type sky;
 
@@ -18,9 +19,13 @@ uniform float dither_strength : hint_range(0, 10) = 1.0;
 uniform sampler2D night_sky : hint_black_albedo;
 
 uniform sampler2D samayun : hint_albedo;
-uniform float samayun_scale : hint_range(0, 1.0) = 0.25;
+uniform float samayun_arc = 25 ;
 uniform vec3 samayun_position = vec3( 0.0, 0.5, 0.0 );
 
+uniform sampler2D zabr : hint_albedo;
+uniform float zabr_arc = 12 ;
+uniform vec3 zabr_position = vec3( 0.0, 0.7, 0.0 );
+
 const vec3 UP = vec3( 0.0, 1.0, 0.0 );
 
 // Sun constants
@@ -42,8 +47,6 @@ float hash(vec3 p) {
 	return fract(p.x * p.y * p.z * (p.x + p.y + p.z));
 }
 
-
-
 void sky() {
 	if (LIGHT0_ENABLED) {
 		float zenith_angle = clamp( dot(UP, normalize(LIGHT0_DIRECTION)), -1.0, 1.0 );
@@ -98,18 +101,30 @@ void sky() {
 		COLOR = texture(night_sky, SKY_COORDS).xyz * 0.04;
 		COLOR *= exposure;
 	}
-//	vec2 samayun_uv = uv_moon(samayun_position, samayun_scale, SKY_COORDS);
+	// Adding Samayun
-//	COLOR += texture(samayun, samayun_uv).rgb;
+	float samayun_scale = radians(samayun_arc) ;
-	if (length(EYEDIR - normalize(samayun_position)) < 0.5 ) { // we are in the area of the sky where samayun is placed
+	if (length(EYEDIR - normalize(samayun_position)) < samayun_scale / 2.0) { // we are in the area of the sky where samayun is placed
 		//We define a local plane tangent to the skydome at samayun_position
         //We work with everything normalized
-        vec3 n1 = normalize(cross(samayun_position,vec3(0,1,0)));
+        vec3 n1 = normalize(cross(samayun_position,vec3(0.0,1.0,0.0))) ;
-        vec3 n2 = normalize(cross(samayun_position,n1));
+        vec3 n2 = normalize(cross(samayun_position,n1)) ;
 		//We project EYEDIR on this plane
         float x = dot(EYEDIR,n1) ;
         float y = dot(EYEDIR,n2) ;
-        
+		// We then add the final result to the sky
-		COLOR += texture(samayun, vec2(x,y)+vec2(0.5)).rgb * texture(samayun, vec2(x,y)+vec2(0.5)).a;
+		COLOR += texture(samayun,  vec2(x,y) / samayun_scale + vec2(0.5)).rgb * texture(samayun, vec2(x,y) / samayun_scale + vec2(0.5)).a;
-		//COLOR = mix(COLOR, texture(samayun, vec2(x,y)+vec2(0.5)).rgb, clamp (samayun_position.y, 0.0, 1.0)) ;
 	}
+	// Adding zabr
+	float zabr_scale = radians(zabr_arc) ;
+	if (length(EYEDIR - normalize(zabr_position)) < zabr_scale / 2.0) { // we are in the area of the sky where zabr is placed
+		//We define a local plane tangent to the skydome at zabr_position
+        //We work with everything normalized
+        vec3 z_n1 = normalize(cross(zabr_position,vec3(0.0,1.0,0.0))) ;
+        vec3 z_n2 = normalize(cross(zabr_position,z_n1)) ;
+		//We project EYEDIR on this plane
+        float z_x = dot(EYEDIR,z_n1) ;
+        float z_y = dot(EYEDIR,z_n2) ;
+		// We then add the final result to the sky
+		COLOR += texture(zabr,  vec2(z_x,z_y) / zabr_scale + vec2(0.5)).rgb * texture(zabr, vec2(z_x,z_y) / zabr_scale + vec2(0.5)).a;
+		}
 }

maps/textures/zabr_tex_001.png.import

@@ -0,0 +1,35 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://y0ka7tysfp6b"
+path.s3tc="res://.godot/imported/zabr_tex_001.png-79bb3a642b1072453481cdab29affd71.s3tc.ctex"
+path.etc2="res://.godot/imported/zabr_tex_001.png-79bb3a642b1072453481cdab29affd71.etc2.ctex"
+metadata={
+"imported_formats": ["s3tc", "etc2"],
+"vram_texture": true
+}
+
+[deps]
+
+source_file="res://maps/textures/zabr_tex_001.png"
+dest_files=["res://.godot/imported/zabr_tex_001.png-79bb3a642b1072453481cdab29affd71.s3tc.ctex", "res://.godot/imported/zabr_tex_001.png-79bb3a642b1072453481cdab29affd71.etc2.ctex"]
+
+[params]
+
+compress/mode=2
+compress/lossy_quality=0.7
+compress/hdr_compression=1
+compress/bptc_ldr=0
+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/size_limit=0
+detect_3d/compress_to=0