CHOLMOD error: problem too large #33
Description
I'm trying to reproduce the tutorial (here) of the paper "Large Steps in Inverse Rendering of Geometry" with a mesh that contains 2mln vertices and 21mln triangles. However, when running the Cholesky decomposition to solve the system (with 26mln nnz in total), I get the following error:
CHOLMOD error: problem too large. file: /project/ext/suitesparse-metis-for-windows/SuiteSparse/CHOLMOD/Include/../Core/cholmod_change_factor.c line: 536
CHOLMOD error: invalid xtype. file: /project/ext/suitesparse-metis-for-windows/SuiteSparse/CHOLMOD/Include/../Core/cholmod_factor.c line: 618
CHOLMOD error: argument missing. file: /project/ext/suitesparse-metis-for windows/SuiteSparse/CHOLMOD/Include/../Core/cholmod_transpose.c line: 897
Why is this the case? Is the matrix too "dense" in the end? I've found this issue and one answer suggests changing the storage of indices to long int. However, I'm not sure if that would solve the issue.