update

shaders/011_circle/circle.gdshader

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+shader_type spatial;
+render_mode cull_disabled;
+
+/*
+	We define the center position of our circle and then ask each pixel how far from that
+	center position it is. This will give the pixel a value between 0 – 1.
+	We can then ask the pixel if its value is lower or higher than a predefined value.
+	If it is higher we will set the pixel to white
+	and if it is lower we will set it to black.
+*/ 
+float circle(vec2 position, float radius, float feather) {
+	return smoothstep(radius, radius + feather, length(position - vec2(0.5)));
+}
+
+void fragment() {
+	ALBEDO.rgb = vec3( circle(UV, 0.3, 0.0) );
+}