shader_type canvas_item;
render_mode unshaded;
uniform float cutoff:hint_range(0.0, 1.0, 0.1);
uniform float smooth_size: hint_range(0.0,1.0,0.1);
uniform sampler2D mask;
void fragment()
{
	float value =texture(mask,UV).r;
	float alpha =smoothstep(cutoff,cutoff,value);
	COLOR=vec4(COLOR.rgb,alpha);
}