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[FantasyVR]

I've been looking for details about how to constructing the stiffness matrix, though I know the general steps according to the siggraph course.

I'm stuck here, how to compute the derivatives of the First Piola-Kirchhoff stress tensor with respect to deformation gradient?

IPC/src/Energy/Energy.cpp

Line 463 in c2206ea

void Energy<dim>::compute_dP_div_dF(const AutoFlipSVD<Eigen::Matrix<double, dim, dim>>& svd,

it there any resource that I can follow so that I can finally understand this.

[liminchen]

Chapter 6 of https://www.seas.upenn.edu/~cffjiang/research/mpmcourse/mpmcourse.pdf has some derivation on it.