Map a real value in range [vmin, vmax] to a (r,g,b) color scale.
:param value: scalar value to transform into a color
:param name: color map name (Default value = "jet")
:type name: str, matplotlib.colors.LinearSegmentedColormap
:param vmin: (Default value = None)
:param vmax: (Default value = None)
:returns: return: (r,g,b) color, or a list of (r,g,b) colors.
.. note:: Most frequently used color maps:
.. image:: https://matplotlib.org/1.2.1/_images/show_colormaps.png
.. tip:: Can also use directly a matplotlib color map:
from vedo import colorMap
import matplotlib.cm as cm
print( colorMap(0.2, cm.flag, 0, 1) )
(1.0, 0.809016994374948, 0.6173258487801733)