FluidSolver::solvePressure skipping CorrectVelocity since res is nan!

[joseph pareti]

working on https://github.com/google/FluidNet

then, when executing following:

./manta ../scenes/_trainingData.py --dim 3 --addModelGeometry True --addSphereGeometry True

the ouptut has entries such as:

FluidSolver::solvePressure skipping CorrectVelocity since res is nan!

According to  https://github.com/google/FluidNet/issues/8 a possible workaround is turn down the gradient clipping magnitude first and see if that works. By default it's 1, but I would try as low as 0.2.

Any idea how to do that? Or any suggestions how to resolve this NaN problem?