The Arithmetic plugin add its actions directly to the krpano root. That means the actions can be called like normal krpano actions.
arithmetic(variable, ((%1+layer[%2].x)*layer[%2].y-layer[%2].width)/%1 );
You are free to use the software in your projects. If you feel making a donation so I can afford to continue making these plugins and making them available please use Donate button and choose amount afordabele for you.