How to do 3D Plot surface with isolinies

[AIMPED]

@luxs

…I need to manually calculate these isolines…but It is not use Plotly ability to calculate them

I think this is the thing. Plotly does this calculation in JS and it’s not accesible from the python side. Either you search for the corresponding functions in the plotly source code on github or you might get some inspiration from this post:

Slicing 3D surface plot along a user selected axis

Hi @fk4517, To get the curve of intersection we need a bit of math. First the cutting plane is defined by a point M(x0, y0, 0), and two directions contained in this plane: v=[a, b, 0], w=[0, 0, 1]. We get the plane equation from the determinant: [plane-eq] The equation of the surface is of the form z=f(x, y), and depending on the position of the plane (i.e. the direction of the vector v) the curve equation can be of the form: y =f(x, y0), y= f(x0, x) or y= f(x, h(x)). That’s why we gie cod…