beginner question: invert mask

[anicg]

I can't find a heightfield node to invert a mask, any idea how to do that? if it's not in a node, can I do it with vex, something like mask=-mask? how would you write it? and is it in an heightfield wrangle?

Edited May 17, 2019 by anicg

[anim]

Heightfield Remap SOP, set layer to mask, and set Output Min/Max to 1/0

or

Heightfield Wrangle SOP

@mask = 1-@mask;

or

@mask = fit01(@mask, 1, 0);

or similar