https://github.com/HTDerekLiu/surface_multigrid_code
Revision 2a5ce10bcc87d1ae648b298a39eec2f368b24b24 authored by HTDerekLiu on 24 May 2021, 13:03:36 UTC, committed by HTDerekLiu on 24 May 2021, 13:03:36 UTC
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Tip revision: 2a5ce10bcc87d1ae648b298a39eec2f368b24b24 authored by HTDerekLiu on 24 May 2021, 13:03:36 UTC
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compute_barycentric.cpp
#include "compute_barycentric.h"
void compute_barycentric(
const Eigen::VectorXd & p,
const Eigen::MatrixXd & UV,
const Eigen::MatrixXi & F,
Eigen::MatrixXd & B)
{
using namespace Eigen;
using namespace std;
bool isDebug = true;
assert(p.size() == 2);
assert(UV.cols() == 2);
MatrixXd a, b, c; // a = UV(F(:,0),:)
a.resize(F.rows(), 2);
b.resize(F.rows(), 2);
c.resize(F.rows(), 2);
{
VectorXi F0 = F.col(0);
VectorXi F1 = F.col(1);
VectorXi F2 = F.col(2);
for (int ii=0; ii<F.rows(); ii++)
{
a.row(ii) = UV.row(F0(ii));
b.row(ii) = UV.row(F1(ii));
c.row(ii) = UV.row(F2(ii));
}
}
MatrixXd v0 = b - a;
MatrixXd v1 = c - a;
MatrixXd v2 = -a;
v2.col(0) = v2.col(0).array() + p(0);
v2.col(1) = v2.col(1).array() + p(1);
// cout << "-a: " << -a << endl;
// cout << "v2: " << v2 << endl;
// cout << "p: " << p << endl;
VectorXd d00 = v0.col(0).cwiseProduct(v0.col(0)) + v0.col(1).cwiseProduct(v0.col(1));
VectorXd d01 = v0.col(0).cwiseProduct(v1.col(0)) + v0.col(1).cwiseProduct(v1.col(1));
VectorXd d11 = v1.col(0).cwiseProduct(v1.col(0)) + v1.col(1).cwiseProduct(v1.col(1));
VectorXd d20 = v2.col(0).cwiseProduct(v0.col(0)) + v2.col(1).cwiseProduct(v0.col(1));
VectorXd d21 = v2.col(0).cwiseProduct(v1.col(0)) + v2.col(1).cwiseProduct(v1.col(1));
VectorXd denom = d00.cwiseProduct(d11) - d01.cwiseProduct(d01);
VectorXd v = (d11.cwiseProduct(d20) - d01.cwiseProduct(d21)).array() / denom.array();
VectorXd w = (d00.cwiseProduct(d21) - d01.cwiseProduct(d20)).array() / denom.array();
// VectorXd u = 1.0f - v.array() - w.array();
VectorXd u = 1.0f - (v + w).array();
B.resize(F.rows(),3);
B.col(0) = u;
B.col(1) = v;
B.col(2) = w;
if (isDebug)
{
for (int ii = 0; ii<u.size(); ii++)
{
if (isnan(u(ii)) || isnan(v(ii)) || isnan(w(ii)))
{
cout << "barycentric coordinate has nan, B = \n" << B <<endl;
}
assert(!isnan(u(ii)));
assert(!isnan(v(ii)));
assert(!isnan(w(ii)));
}
}
}
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