液体涟漪遮罩 Ripple mask

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shader_type canvas_item;

uniform vec2 center=vec2(0.5);

void fragment(){
    float r=distance(UV,center);
    float ripple=sin(r*50.0-TIME*5.0)*0.05;
    COLOR=texture(TEXTURE,UV+normalize(UV-center)*ripple);
}