Simplified ConnecctionCable shader

game/shaders/connection_cable.gdshader

@@ -5,19 +5,13 @@ uniform float glow_radius : hint_range(0.0, 1.0, 0.00001) = 1.0;
 uniform float travel_time : hint_range(0.0, 100.0, 1) = 5.0;
 
 float get_alpha(vec2 uv, float offset) {
-	float dist = fract(mod(TIME, travel_time)/travel_time + offset);
-	float left = uv.x - glow_radius;
-	float right = uv.x + glow_radius;
-	return step(left, dist) * (1.0 - step(right, dist));
+	float progress = fract(mod(TIME, travel_time)/travel_time + offset);
+	return step(distance(progress, uv.x), glow_radius);
 }
 
 void fragment() {
-	float alpha = 0.0;
-	float offset = 0.0;
-	
+	COLOR.a = 0.0;
 	for (float offset = 0.0; offset <= 1.0; offset += glow_interval) {
-		alpha += get_alpha(UV, offset);
+		COLOR.a += get_alpha(UV, offset);
 	}
-	
-	COLOR.a = alpha;
 }