Request: Adding isolines_intrinsic to the python bindings #230
Description
Hello,
I believe exposing the isolines_intrinsic function with a Python binding could be highly beneficial. This function can be particularly useful when interpolating data beyond point coordinates. Here is the file I added to my build to access isolines_intrinsic. It seems to work without issues so far:
// This file is part of libigl, a simple c++ geometry processing library.
//
// Copyright (C) 2023 Teseo Schneider
//
// This Source Code Form is subject to the terms of the Mozilla Public License
// v. 2.0. If a copy of the MPL was not distributed with this file, You can
// obtain one at http://mozilla.org/MPL/2.0/.
//TODO: __example
#include <common.h>
#include <npe.h>
#include <typedefs.h>
#include <igl/isolines_intrinsic.h>
const char *ds_isolines_intrinsic = R"igl_Qu8mg5v7(
Constructs isolines interpolation parameters for a function z given on a mesh (V,F)
Parameters
----------
F #F by 3 list of mesh triangle indices into V
S #S by 1 list of per-vertex scalar values
vals #vals by 1 list of values to compute isolines for
Returns
-------
iB #iB by 3 list of barycentric coordinates
iFI #iB list of triangle indices for each row of iB
iE #iE by 2 list of edge indices into iV
I #iE by 1 list of indices into vals indicating which value
See also
--------
Notes
-----
None
Examples
--------
)igl_Qu8mg5v7";
npe_function(isolines_intrinsic)
npe_doc(ds_isolines_intrinsic)
npe_arg(F, dense_int32, dense_int64)
npe_arg(S, dense_float, dense_double)
npe_arg(vals, npe_matches(S))
npe_begin_code()
assert_cols_equals(S, 1, "S");
Eigen::Matrix<typename npe_Matrix_S::Scalar, Eigen::Dynamic, 3> iB;
Eigen::Matrix<int, Eigen::Dynamic, 1> iFI;
EigenDenseLike<npe_Matrix_F> iE;
Eigen::Matrix<typename npe_Matrix_F::Scalar, Eigen::Dynamic, 1> I;
Eigen::Matrix<typename npe_Matrix_vals::Scalar, Eigen::Dynamic, 1> vals_copy = vals;
igl::isolines_intrinsic(F, S.col(0), vals_copy, iB, iFI, iE, I);
return std::make_tuple(npe::move(iB), npe::move(iFI), npe::move(iE), npe::move(I));
npe_end_code()
This was useful for me, so I though maybe someone else could need it at some point