Question about scale adjustment and TravelField function

[MarsVegetables]

Hi,
Thank you for providing this awesome project.
In this project, Adjustment of scale is a very important operation to obtain a beautiful result. However, in the paper, I do not find the detail about the scale adjustment. Hence, I have few questions about it.

1. Is the scale adjustment operation based on a published paper or existing algorithm?
2. In TravelField function, how to understand the following code block.
   MatrixXd &T = triangle_space[f]; VectorXd coord = T * Vector3d(p - V.col(F(0, f))); VectorXd dirs = (T * pt); double lens[3]; lens[0] = -coord.y() / dirs.y(); lens[1] = (1 - coord.x() - coord.y()) / (dirs.x() + dirs.y()); lens[2] = -coord.x() / dirs.x();
3. In EstimateSlope(), could you please teach me why we need area when calculate mK at line 93, and then divide it at line 99.

Thank you for your time,