Project-Elysium/simple-starfield
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Create multicolored starfield

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Update gitignore
This commit is contained in:
Gabriella Agathon
2025-10-22 11:59:53 -06:00
parent 20f4f7bfc1
commit 585495d984
5 changed files with 109 additions and 48 deletions
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1
.gitignore vendored
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@@ -1,2 +1,3 @@
.editorconfig
.ds_store
.godot/

48
src/multi-color-starfield/mc_starfield.gdshader
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@@ -3,28 +3,44 @@ shader_type canvas_item;
uniform vec2 resolution = vec2(1270, 720);
uniform sampler2D noise_texture: filter_nearest, repeat_enable;
uniform float density: hint_range(1.0, 100.0, 0.1) = 20.0;
uniform float speed_x: hint_range(-100.0, 100, 0.1) = 0.005;
uniform float speed_y: hint_range(-100.0, 100, 0.1) = 0.0;
uniform float speed_x: hint_range(-0.01, 0.01, 0.005) = 0.005;
uniform float speed_y: hint_range(-0.01, 0.01, 0.005) = 0.0;
uniform float layers: hint_range(1, 10, 1) = 5;
uniform vec4 color_1: source_color;
uniform vec4 color_2: source_color;
uniform vec4 color_3: source_color;
uniform vec4 color_4: source_color;
float rand(vec2 uv) {
return fract(sin(dot(uv.xy, vec2(12.9898,78.233))) * 43758.5453123);
}
void fragment() {
vec2 uv = UV;
uv.x *= resolution.x / resolution.y;
vec2 speed = TIME * vec2(speed_x, speed_y);
float stars = 0.0;
for(float i = 0.0; i < layers; i++){
float shift = i * 0.3;
float brightness = 1.0 - i * 0.2;
stars += step(0.2, pow(texture(noise_texture, uv + shift + speed * (1.0 - i * 0.1)).r, density)) * brightness;
float rand_y(vec2 uv){
return fract(sin(uv.y) * 43759.234231);
}
void fragment() {
// for each pixel, grab the UV value (coordinates
vec2 uv = UV;
// reset aspect ratio
uv.x *= resolution.x / resolution.y;
// this is the speed value, TIME is analogous to u_time
vec2 speed = TIME * vec2(speed_x, speed_y);
// 'empty' float
float stars = 0.0;
vec3 new_stars;
//for loop for each layer
for(int i = 0; i < int(layers); i++){
// this is the parallax value
// TODO can be parameterized
float shift = float(i) * 0.3;
// brightness dependent on the layer a star is in
// simulating loss of brightness over distance
float brightness = 1.0 - float(i) * 0.2;
// we're looking for the "loudest" (whitest) noise on the noise texture
// this is inversely proportional to the denisty value
// 1 = more stars
// we add shift and speed to the uv value, and apply a simple parallax equation
// in order to get movement (as defined by the vec2 `speed`
stars += pow(texture(noise_texture, uv + shift + speed * (1.0 - float(i) * 0.1)).r, density);
new_stars = vec3(stars);
COLOR = vec4(new_stars, 1.0);
}
COLOR = vec4(vec3(stars), 1.0);
}

7
src/multi-color-starfield/mc_starfield_material.tres
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@@ -11,7 +11,6 @@ shader_parameter/density = 20.0
shader_parameter/speed_x = 0.005
shader_parameter/speed_y = 0.0
shader_parameter/layers = 7.0
shader_parameter/color_1 = Color(0.3403393, 0.34033933, 0.3403393, 1)
shader_parameter/color_2 = Color(0, 0, 0, 1)
shader_parameter/color_3 = Color(0, 0, 0, 1)
shader_parameter/color_4 = Color(0, 0, 0, 1)
shader_parameter/upper_tolerance_for_star_color = 0.5000000074506
shader_parameter/lower_tolerance_for_star_color = 0.25
shader_parameter/green_tolerance_for_star_color = 0.1

75
src/multi-color-starfield/multi_color_starfield.gdshader
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@@ -1,24 +1,61 @@
shader_type canvas_item;
uniform sampler2D noise_img;
uniform sampler2D gradient_tex;
uniform float speed = 1.0;
uniform vec4 smoke_color : source_color;
uniform vec2 resolution = vec2(1270, 720);
uniform sampler2D noise_texture: filter_nearest, repeat_enable;
uniform float density: hint_range(1.0, 100.0, 0.1) = 20.0;
uniform float speed_x: hint_range(-0.01, 0.01, 0.005) = 0.005;
uniform float speed_y: hint_range(-0.01, 0.01, 0.005) = 0.0;
uniform float layers: hint_range(1, 10, 1) = 5;
uniform float upper_tolerance_for_star_color: hint_range(0.0, 1.0, 0.1) = 0.75;
uniform float lower_tolerance_for_star_color: hint_range(0.0, 1.0, 0.1) = 0.25;
uniform float green_tolerance_for_star_color: hint_range(0.0, 1.0, 0.1) = 0.1;
float rand(vec2 uv) {
return fract(sin(dot(uv.xy, vec2(12.9898,78.233))) * 43758.5453123);
}
float rand_y(vec2 uv){
return fract(sin(uv.y) * 43759.234231);
}
void fragment() {
vec2 uv1 = vec2(UV.x * 0.5 + TIME*speed, UV.y * 0.5 + TIME*speed*2.0);
vec2 uv2 = vec2(UV.x - TIME*speed, UV.y + TIME*speed*2.0);
vec2 uv3 = vec2(UV.x * 2.0, UV.y * 2.0 + TIME * speed*6.0);
float gradient = texture( gradient_tex, vec2(UV.y, UV.x) ).r;
float noise_r = texture( noise_img, uv1 ).r;
float noise_g = texture( noise_img, uv2 ).g;
float noise_b = texture( noise_img, uv3 ).b;
vec3 new_color = vec3(noise_r, noise_g, noise_b);
float new_alpha = noise_r * noise_g * noise_b * noise_r;
COLOR.rgb = smoke_color.rgb;
COLOR.a = gradient;
// for each pixel, grab the UV value (coordinates
vec2 uv = UV;
// reset aspect ratio
uv.x *= resolution.x / resolution.y;
// this is the speed value, TIME is analogous to u_time
vec2 speed = TIME * vec2(speed_x, speed_y);
// 'empty' float
float stars = 0.0;
vec3 new_stars;
//for loop for each layer
for(int i = 0; i < int(layers); i++){
// this is the parallax value
// TODO can be parameterized
float shift = float(i) * 0.3;
// brightness dependent on the layer a star is in
// simulating loss of brightness over distance
float brightness = 1.0 - float(i) * 0.2;
// we're looking for the "loudest" (whitest) noise on the noise texture
// this is inversely proportional to the denisty value
// 1 = more stars
// we add shift and speed to the uv value, and apply a simple parallax equation
// in order to get movement (as defined by the vec2 `speed`
stars += pow(texture(noise_texture, uv + shift + speed * (1.0 - float(i) * 0.1)).r, density);
new_stars = vec3(stars);
if (rand_y(uv) >= upper_tolerance_for_star_color){
new_stars.g -= 0.2;
new_stars.r -= 1.0;
} else if (rand_y(uv) <= lower_tolerance_for_star_color){
new_stars.g -= 0.75;
new_stars.r -= 0.25;
} else if (rand_y(uv) <= green_tolerance_for_star_color){
new_stars.r -= 1.0;
new_stars.b -= 1.0;
} else{
new_stars = new_stars;
}
COLOR = vec4(new_stars, 1.0);
}
}

34
src/multi-color-starfield/multi_color_starfield.tscn
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@@ -1,22 +1,29 @@
[gd_scene load_steps=7 format=3 uid="uid://c6f75hdvqpfaf"]
[gd_scene load_steps=5 format=3 uid="uid://c6f75hdvqpfaf"]
[ext_resource type="Material" uid="uid://bgb22q7b2j1st" path="res://src/multi-color-starfield/mc_starfield_material.tres" id="1_yileu"]
[ext_resource type="Shader" uid="uid://nfhuhvwogwqv" path="res://src/multi-color-starfield/multi_color_starfield.gdshader" id="2_mfsqn"]
[ext_resource type="Texture2D" uid="uid://cq1atp8etcqe8" path="res://src/multi-color-starfield/spotlight_3.png" id="3_2bx6i"]
[sub_resource type="Gradient" id="Gradient_2bx6i"]
colors = PackedColorArray(0, 0, 0, 1, 0.31431612, 0.31431612, 0.3143161, 1)
[sub_resource type="GradientTexture2D" id="GradientTexture2D_vs6nd"]
gradient = SubResource("Gradient_2bx6i")
fill_from = Vector2(0, 0.032967035)
[sub_resource type="ShaderMaterial" id="ShaderMaterial_vs6nd"]
shader = ExtResource("2_mfsqn")
shader_parameter/resolution = Vector2(1270, 720)
shader_parameter/density = 20.0
shader_parameter/speed_x = 0.005
shader_parameter/speed_y = 0.0
shader_parameter/layers = 5.0
shader_parameter/upper_tolerance_for_star_color = 0.75
shader_parameter/lower_tolerance_for_star_color = 0.25
shader_parameter/green_tolerance_for_star_color = 0.1
[sub_resource type="ShaderMaterial" id="ShaderMaterial_2bx6i"]
shader = ExtResource("2_mfsqn")
shader_parameter/noise_img = ExtResource("3_2bx6i")
shader_parameter/gradient_tex = SubResource("GradientTexture2D_vs6nd")
shader_parameter/speed = 1.0
shader_parameter/smoke_color = Color(0.09638075, 0.25795576, 0.4848613, 1)
shader_parameter/resolution = Vector2(1270, 720)
shader_parameter/density = 20.0
shader_parameter/speed_x = 0.005
shader_parameter/speed_y = 0.0
shader_parameter/layers = 5.0
shader_parameter/upper_tolerance_for_star_color = 0.75
shader_parameter/lower_tolerance_for_star_color = 0.25
shader_parameter/green_tolerance_for_star_color = 0.1
[node name="MultiColorStarfield" type="Control"]
layout_mode = 3
@@ -27,7 +34,7 @@ grow_horizontal = 2
grow_vertical = 2
[node name="ColorRect2" type="ColorRect" parent="."]
visible = false
material = SubResource("ShaderMaterial_vs6nd")
layout_mode = 0
offset_right = 1270.0
offset_bottom = 720.0
@@ -40,6 +47,7 @@ offset_right = 1270.0
offset_bottom = 720.0
[node name="ColorRect" type="ColorRect" parent="."]
visible = false
material = SubResource("ShaderMaterial_2bx6i")
layout_mode = 0
offset_top = 2.0