PsiComplex
The \Psi_4 Weyl Scalar is a complex quantity, which can
be interpreted under some assumptions as the `outgoing gravitational' wave.
The real part indicates the even parity component, the imaginary part
stands for the odd part.
For axisymmetric cases,
the odd part, and therefore Im{\Psi_4} is zero.
For full 3D structures, this is no longer the case.
Re{\Psi_4} is rendered as red volumetric isolevels,
as in the former Psi4AH video, but seen
from a different view position.
Additionally, Im{\Psi_4}2 is shown as blue
volumetric isolevels.
While Re{\Psi_4} shows two `pulses' running towards
the (+x,0,+z) and (-x,0,-z) direction and becomes quite chaotic, unstructured
at later time steps, Im{\Psi_4} appears as two pulses
running in opposite directions towards (0,+y,0) and (0,-y,0), so
mainly moving orthogonal to the Re{\Psi_4} pulse direction.
The geometric structure of Im{\Psi_4} remains remarkably
clean at later time steps, it does not show the chaotic behaviour of
Re{\Psi_4}.
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