Speed Effect

This is a high quality ‘speed’ shader. Follow these steps to use this:

1. Set the noise texture, Create a new NoiseTexture2D.

2. To animate the speed lines, Adjust the sample radius using a tween.

Some recommendations:
1. A high noise frequency in the fast noise lite settings is recommended, But setting it too high may cause weird issues.

2. You can adjust hole smoothness and hole radius to make the lines not appear in the middle. You can also adjust the transparency to make the entire effect less noticable.

A few notes:
1. This code was originally taken from a different shader, This is basically a wrapper around that shader but with a few more features.

Shader code

shader_type canvas_item;

uniform vec2 center = vec2(0.5, 0.5);
uniform sampler2D noise;
uniform float sample_radius: hint_range(0.0, 1.0) = 0.5;
uniform vec4 line_color: source_color = vec4(1.0);
uniform float center_radius: hint_range(0.0, 1.0) = 0.5;
uniform float hole_smoothness: hint_range(0.0, 1.0) = 0.4;
uniform float hole_radius: hint_range(0.0, 1.0) = 0.34;
uniform float transparency: hint_range(0.0, 1.0) = 1.0;

void fragment() {
	vec2 distance_vector = UV - center;
	float distance_float = length(distance_vector);

	float angle = atan(distance_vector.y / distance_vector.x);
	vec2 sample = vec2(sample_radius * cos(angle), sample_radius * sin(angle));
	float noise_value = texture(noise, sample).r;
	vec4 color = mix(line_color, vec4(0.0), noise_value);

	// Apply the hole
    float alpha = smoothstep(hole_radius, hole_radius + hole_smoothness, distance_float);
    color.a *= alpha;
	color.a *= transparency;

	color = mix(color, vec4(0.0), 1.0 - distance_float - center_radius);
	COLOR = color;
}

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