bring back F.XYZ
This MR is to be reviewed, ci-tested and merged together with Rec!2570 (merged).
F.X
, F.Y
and F.Z
was commented out in !924 (merged) . Now bring them back as they are fixed in Rec!2570 (merged).
New functions are defined for vertex position, named as F.V(X, Y, Z, Rho)
.
Edited by Mengzhen Wang