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GodotRetro/Object Shaders/Debug/helloworld2.shader

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+//SHADER GRABED FROM THE BOOK OF SHADERS
+//PORTED AND MODIFYED TO GODOT BY AHOPNESS (@ahopness)
+//LICENSE : CC0
+//SHADERTOY LINK : https://thebookofshaders.com/edit.php#06/hsb-colorwheel.frag
+
+shader_type spatial;
+render_mode cull_disabled, specular_disabled, diffuse_lambert, unshaded;
+
+const float TWO_PI = 6.28318530718;
+
+vec3 hsb2rgb( in vec3 c ){
+    vec3 rgb = clamp(abs(mod(c.x*6.0+vec3(0.0,4.0,2.0),
+                             6.0)-3.0)-1.0,
+                     0.0,
+                     1.0 );
+    rgb = rgb*rgb*(3.0-2.0*rgb);
+    return c.z * mix( vec3(1.0), rgb, c.y);
+}
+
+void fragment(){
+    vec2 st = UV;
+    vec3 color = vec3(0.0);
+
+    // Use polar coordinates instead of cartesian
+    vec2 toCenter = vec2(0.5)-st;
+    float angle = atan(toCenter.y,toCenter.x);
+    float radius = length(toCenter)*2.0;
+
+    // Map the angle (-PI to PI) to the Hue (from 0 to 1)
+    // and the Saturation to the radius
+    color = hsb2rgb(vec3((angle/TWO_PI)+0.5,radius,1.0));
+
+    ALBEDO = color;
+}