  We propose a reduced space mixed finite element method (MFEM) built on a
Skinning Eigenmode subspace and material-aware cubature scheme. Our solver is
well-suited for simulating scenes with large material and geometric
heterogeneities in real-time. This mammoth geometry is composed of 98,175
vertices and 531,565 tetrahedral elements and with a heterogenous composition
of widely varying materials of muscles ($E= 5\times10^5$ Pa), joints
($E=1\times10^5$ Pa), and bone ($E=1\times10^{10}$ Pa). The resulting
simulation runs at 120 frames per second (FPS).
