If not too difficult to implement, would it be possible to dispaly a 3D vector of the Reaction Force (sum of X,Y,Z components). It helps to instantly visualise the RF direction and makes it handy for plotting in FEA reports. This seems a common feature in some commercial software.
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Abaqus has symbol plots for vector and tensor outputs, including RF:
But it also has a very useful Free body cut tool to display forces and moments (components or resultants) at any cross-section:
ParaView also has symbol (glyph) plots that can be used for RF as well:
FreeCAD has this VTK filter available since v 1.1, but it doesn’t store RF yet.
maybe, this can be possible as extension of section print feature currently available.
Free body cut based on a view cut in Abaqus simply integrates the stress field over the area. For beams and shells, it needs the section force/moment (SF/SM) output. There’s also more advanced Free body cut feature that can calculate the forces/moments for the selected edges/faces or elements/nodes, but it needs the NFORC (forces at the nodes of an element) output.