[Gmsh] Different interpolation schemes

[Marios Papadopoulos]

Dear gmshers,

attached you will find two contour plots from a scalar field. The first one
(contour1.png) was made with gmsh using $NodeData feature, without using
any extra $InterpolationScheme rule info. The second one (contour2.png) was
made using another post-processing software with the same nodal values.
This second image is the right represantion of the contour for the scalar
field.

As you notice, gmsh interpolate the nodal values with a "wrong" way.
Ignoring the color mapping, how i can use the $InterpolationScheme feature
in .msh format in order to get the right distribution inside the elements
from the corresponding nodal values?

i.e.
$InterpolationScheme
"name"
number-of-element-topologies
elm-topology
number-of-interpolation-matrices
num-rows num-columns value
... ...
$EndInterpolationScheme

Thank you in advance!
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