Improve planet textures; add flowmaps

Flowmaps inspired by this tutorial: https://www.youtube.com/watch?v=KfphtLRoUB0

Materials/GasGiantMaterial.tres

@@ -0,0 +1,46 @@
+[gd_resource type="ShaderMaterial" load_steps=4 format=2]
+
+[ext_resource path="res://Resources/gas_planet_flowmap.png" type="Texture" id=1]
+[ext_resource path="res://Resources/gas_planet_base.png" type="Texture" id=2]
+
+[sub_resource type="Shader" id=1]
+resource_local_to_scene = true
+code = "shader_type spatial;
+
+uniform sampler2D base_texture: hint_albedo;
+uniform sampler2D flowmap;
+uniform vec4 color: hint_color;
+
+uniform float flow_speed = 0.1;
+uniform float flow_intensity = 0.1;
+
+void fragment(){
+	// Flow
+	vec2 flow = texture(flowmap, UV).xy;
+	flow = (flow - 0.5) * 2.0;
+	
+	// We use two phases which are exactly halfway offset from one another, and we blend between those.
+	// That way, the animation seems to go on infinitely (similar to a Shepard tone)
+	float time_phase_1 = fract(TIME * flow_speed);
+	float time_phase_2 = fract(time_phase_1 + 0.5);
+	float flow_mix = abs((time_phase_1 - 0.5) * 2.0);
+	
+	// Read the color values based on the offsets from the flowmap samples and mix them
+	vec3 base_tex_1 = texture(base_texture, UV + (flow * time_phase_1 * flow_intensity)).xyz;
+	vec3 base_tex_2 = texture(base_texture, UV + (flow * time_phase_2 * flow_intensity)).xyz;
+	vec3 base_tex_mix = mix(base_tex_1, base_tex_2, flow_mix);
+	
+	// Apply the custom color scaled by that previous greyscale sample
+	vec3 final_color = (0.05 + base_tex_mix.x * 0.95) * color.xyz;
+	
+	ALBEDO = final_color;
+}
+"
+
+[resource]
+shader = SubResource( 1 )
+shader_param/color = Color( 1, 0.584314, 0, 1 )
+shader_param/flow_speed = 0.2
+shader_param/flow_intensity = 0.8
+shader_param/base_texture = ExtResource( 2 )
+shader_param/flowmap = ExtResource( 1 )

Materials/GasGiantShader.shader

@@ -0,0 +1,30 @@
+shader_type spatial;
+
+uniform sampler2D base_texture: hint_albedo;
+uniform sampler2D flowmap;
+uniform vec4 color: hint_color;
+
+uniform float flow_speed = 0.1;
+uniform float flow_intensity = 0.1;
+
+void fragment(){
+	// Flow
+	vec2 flow = texture(flowmap, UV).xy;
+	flow = (flow - 0.5) * 2.0;
+	
+	// We use two phases which are exactly halfway offset from one another, and we blend between those.
+	// That way, the animation seems to go on infinitely (similar to a Shepard tone)
+	float time_phase_1 = fract(TIME * flow_speed);
+	float time_phase_2 = fract(time_phase_1 + 0.5);
+	float flow_mix = abs((time_phase_1 - 0.5) * 2.0);
+	
+	// Read the color values based on the offsets from the flowmap samples and mix them
+	vec3 base_tex_1 = texture(base_texture, UV + (flow * time_phase_1 * flow_intensity)).xyz;
+	vec3 base_tex_2 = texture(base_texture, UV + (flow * time_phase_2 * flow_intensity)).xyz;
+	vec3 base_tex_mix = mix(base_tex_1, base_tex_2, flow_mix);
+	
+	// Apply the custom color scaled by that previous greyscale sample
+	vec3 final_color = (0.05 + base_tex_mix.x * 0.95) * color.xyz;
+	
+	ALBEDO = final_color;
+}

Materials/PerlinPlanetShader.shader

@@ -1,13 +1,10 @@
-[gd_resource type="ShaderMaterial" load_steps=2 format=2]
-
-[sub_resource type="Shader" id=1]
-code = "shader_type spatial;
+shader_type spatial;
 
 
 uniform vec2 scale = vec2(50.0);
 uniform bool seamless = false;
 
-uniform vec3 color_scale;
+uniform vec4 color_scale: hint_color;
 
 float rand(vec2 coord) {
 	return fract(sin(dot(coord, vec2(12.9898, 78.233))) * 43758.5453);
@@ -46,12 +43,5 @@ void fragment() {
 	
 	float value = perlin_noise(coord);
 	
-	ALBEDO = vec3(value * color_scale);
-}"
-
-[resource]
-resource_local_to_scene = true
-shader = SubResource( 1 )
-shader_param/scale = Vector2( 50, 50 )
-shader_param/seamless = false
-shader_param/color_scale = Vector3( 0.8, 0.2, 0.4 )
+	ALBEDO = vec3(value * color_scale.rgb);
+}

Materials/PlanetMaterial.tres

@@ -0,0 +1,10 @@
+[gd_resource type="ShaderMaterial" load_steps=2 format=2]
+
+[ext_resource path="res://Materials/PerlinPlanetShader.shader" type="Shader" id=1]
+
+[resource]
+resource_local_to_scene = true
+shader = ExtResource( 1 )
+shader_param/scale = Vector2( 20, 40 )
+shader_param/seamless = false
+shader_param/color_scale = Color( 0.160784, 0.411765, 0.72549, 1 )

Resources/gas_planet_base.png.import

@@ -0,0 +1,36 @@
+[remap]
+
+importer="texture"
+type="StreamTexture"
+path.s3tc="res://.import/gas_planet_base.png-1056673f46c3b64eaf0d4ae7a8b6d514.s3tc.stex"
+path.etc2="res://.import/gas_planet_base.png-1056673f46c3b64eaf0d4ae7a8b6d514.etc2.stex"
+metadata={
+"imported_formats": [ "s3tc", "etc2" ],
+"vram_texture": true
+}
+
+[deps]
+
+source_file="res://Resources/gas_planet_base.png"
+dest_files=[ "res://.import/gas_planet_base.png-1056673f46c3b64eaf0d4ae7a8b6d514.s3tc.stex", "res://.import/gas_planet_base.png-1056673f46c3b64eaf0d4ae7a8b6d514.etc2.stex" ]
+
+[params]
+
+compress/mode=2
+compress/lossy_quality=0.7
+compress/hdr_mode=0
+compress/bptc_ldr=0
+compress/normal_map=0
+flags/repeat=true
+flags/filter=true
+flags/mipmaps=true
+flags/anisotropic=false
+flags/srgb=1
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/HDR_as_SRGB=false
+process/invert_color=false
+stream=false
+size_limit=0
+detect_3d=false
+svg/scale=1.0

Resources/gas_planet_flowmap.png.import

@@ -0,0 +1,36 @@
+[remap]
+
+importer="texture"
+type="StreamTexture"
+path.s3tc="res://.import/gas_planet_flowmap.png-448b81864accf30ac7e426b237f70468.s3tc.stex"
+path.etc2="res://.import/gas_planet_flowmap.png-448b81864accf30ac7e426b237f70468.etc2.stex"
+metadata={
+"imported_formats": [ "s3tc", "etc2" ],
+"vram_texture": true
+}
+
+[deps]
+
+source_file="res://Resources/gas_planet_flowmap.png"
+dest_files=[ "res://.import/gas_planet_flowmap.png-448b81864accf30ac7e426b237f70468.s3tc.stex", "res://.import/gas_planet_flowmap.png-448b81864accf30ac7e426b237f70468.etc2.stex" ]
+
+[params]
+
+compress/mode=2
+compress/lossy_quality=0.7
+compress/hdr_mode=0
+compress/bptc_ldr=0
+compress/normal_map=0
+flags/repeat=true
+flags/filter=true
+flags/mipmaps=true
+flags/anisotropic=false
+flags/srgb=2
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/HDR_as_SRGB=false
+process/invert_color=false
+stream=false
+size_limit=0
+detect_3d=false
+svg/scale=1.0