exported paraview scenes should have same colormap so that they look identical to what paraview made by default
from: paraview/paraview#16911 (closed)
In the short term we will add ParaView’s default blue-white-red colormap to the viewer’s default set (you can already load it manually if you like) and make it the default. Longer term we can push the color map into the json file so that we always get an exact correspondence.