Nov 20 release, restart simulation crashed with transparent surface about sparta

[stanmoore1]

I tried the reproducer. With no transparent surfaces, it runs fine. With transparent surfaces, I get ERROR on proc 0: Collision cell volume is zero (../collide.cpp:482) after reading in the restart file:

Reading restart file ...
  restart file = 20 Nov 2020, SPARTA = 20 Nov 2020
  orthogonal box = (0 0 -0.5) to (20 10 0.5)
  400 grid cells
  109849 particles
  100 surf lines
  0 0 = number of pushed cells
  72 0 = cells overlapping surfs, overlap cells with unmarked corner pts
  256 72 72 = cells outside/inside/overlapping surfs
  72 = surf cells with 1,2,etc splits
  143.600044896042 143.600044896042 = cell-wise and global flow volume
  CPU time = 0.0516171 secs
  read/surf2grid/rebalance/ghost/inout percent = 90.7879 5.18019 0.0969986 1.99909 1.93581
Memory usage per proc in Mbytes:
  particles (ave,min,max) = 3.375 1.6875 5.0625
  grid      (ave,min,max) = 1.51379 1.51379 1.51379
  surf      (ave,min,max) = 0.0102997 0.0102997 0.0102997
  total     (ave,min,max) = 4.89948 3.21198 6.58698
Step CPU Np Natt Ncoll Nscoll Nscheck c_2[1] c_2[2] 
    1000            0   109849        0        0        0        0            0            0 
ERROR on proc 0: Collision cell volume is zero (../collide.cpp:482)

[stanmoore1]

I talked to @sjplimp and we agree that the transparent flag should be included in the restart file. I'll submit a PR.

[zhangchonglin]

Thanks Stan! @stanmoore1. I noticed in your PR #213, you added transparent flag to 2d simulation case (lines). Should you also do that for 3d simulation case (triangle surfaces)?

[stanmoore1]

Should you also do that for 3d simulation case (triangle surfaces)?

@zhangchonglin Yes, I totally forgot that, thanks!