Do not convert to ndarray since supporting ragged tuples is useful for 2D visualization,

like (data.real, data.imag, 0) for complex numbers. This will trigger a deprecation warning since NumPy 1.19.

src/empyre/vis/colors.py

@@ -64,7 +64,7 @@ class Colormap3D(colors.Colormap, metaclass=abc.ABCMeta):
 
         """
         self._log.debug('Calling rgb_from_vector')
-        x, y, z = np.asarray(vector)
+        x, y, z = vector
         R = np.sqrt(x ** 2 + y ** 2 + z ** 2)
         R_max = vmax if vmax is not None else R.max() + 1E-30
         # FIRST color dimension: HUE (1D ring/angular direction)