Radial Blur

Simple radial blur shader. 

It’s probably not very efficient.

I would love any suggestions or optimizations! 


Value: Value, in radians, of the radial blur. Set it to however many radians you rotated this frame multiplied by how blurry you want your sprite to be.

Quality: The number of overlays it will make between 0 and value

Occilation Speed: Used for debugging. Occilates value from value – 1 to value +1. You should probably leave it at 0.

Scalue value: Expands the vertex so that you can rotate your sprite. If your sprite clips on the edge of the bounding box, Raise this value.

Xoffset: offsets the sprite’s rotation point on the x axis

Yoffset: offsets the sprite’s rotation point on the y axis

Shader code
shader_type canvas_item;

uniform float value : hint_range(-6.283, 6.283, 0.1);
uniform int quality : hint_range(1, 100, 1);

uniform float occilation_speed : hint_range(0.0, 10.0, 0.1);

uniform float scale_value : hint_range(0.0, 10.0, 0.1);

uniform float xOffset : hint_range(-0.5, 0.5);
uniform float yOffset : hint_range(-0.5, 0.5);

vec2 rotated(vec2 pos, float rads){

    pos -= vec2(0.5,0.5);

    float tempvecx = pos.x * cos(rads) - pos.y * sin(rads);

    float tempvecy = pos.x * sin(rads) + pos.y * cos(rads);

    vec2 finalvalue = vec2(tempvecx,tempvecy) + vec2(0.5,0.5);

    return finalvalue;

vec2 scale(vec2 uv, float x, float y)
	mat2 scale = mat2(vec2(x, 0.0), vec2(0.0, y));
	uv -= 0.5;
	uv = uv * scale;
	uv += 0.5;
	if (uv.x >= 0.0 && uv.x <= 1.0 && uv.y >= 0.0 && uv.y <= 1.0)
		return uv;
	return vec2(-20.0*scale_value,-20.0*scale_value);

void fragment(){
	COLOR = vec4(0,0,0,0);
	float i = 0.0;
	for (int j = 0; j < quality; j++ ){
		i += (value+ sin(TIME*occilation_speed)/2.0 )  /float(quality);
		COLOR += texture(TEXTURE,scale(rotated(UV,i)+vec2(xOffset/scale_value,yOffset/scale_value), scale_value,scale_value ));
	float t = 1.0/float(quality);
	COLOR *= t;

void vertex(){

	VERTEX.y *= scale_value;
	VERTEX.x *= scale_value;
blur, motion blur, radial blur
The shader code and all code snippets in this post are under CC0 license and can be used freely without the author's permission. Images and videos, and assets depicted in those, do not fall under this license. For more info, see our License terms.

Related shaders

Radial Blur Shader

Radial Speedlines

2D Radial Distortion – Fisheye/Barrel

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