I understand that you seek guidance in positioning the line upon the designated plane of the three-dimensional object at hand. After conducting a thorough review of the code files you have provided, it became clear that the key to controlling the line's position lies within the manipulation of the "iv" variable. Through a series of experiments with the values of "iv" variable, the most effective setting to achieve the precise alignment comes out to be "0.42". Here is the updated code snippet for your reference
vertices = importdata("NODES.mat");
faces = importdata("FACES.mat");
TR.vertices = vertices;
TR.faces = faces;
P = importdata("V_plane.mat");
iv = 0.42; % influences position of line
IsoCut_demo3_test(iv,TR,P);
Please find the 3D object below which features the line in the desired position
I hope this helps.
