旋转模糊 Spin Blur

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shader_type canvas_item;

uniform int samples=6;
uniform float angle=0.2;

void fragment(){
    vec2 p=UV-0.5; float r=length(p); float a=atan(p.y,p.x);
    vec4 acc=vec4(0.0);
    for(int i=0;i<6;i++){
        float t=(float(i)/float(max(samples,1))-0.5)*angle;
        vec2 uv=0.5+vec2(cos(a+t),sin(a+t))*r;
        acc+=texture(TEXTURE,uv);
    }
    COLOR=acc/float(max(samples,1));
}