<args format="1.0">
    <shaderType>
        <tag value="pattern"/>
    </shaderType>
    <help>
        Looks for a user attribute with a value 0 to 1. Uses threshold to return 0 OR 1.
    </help>
        <param name="attrname" label="Attribute Name" type="string" default="probability" input="False" widget="default"/>
        <param name="threshold" label="Presence Threshold" type="float" default="1" input="True" min="0" max="1" widget="default"/>
        <output name="resultMask"  tag="float|pattern"/>
        <output name="resultF"     tag="float|pattern"/>
    <rfmdata nodeid="1053510" classification="rendernode/RenderMan/pattern"/>
</args>