Vector field options with the arrows above and in a single color #278
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This PR adds two options for visualization of vector fields. They are similar to the options 2 and 3, but the arrows are drawn above the function surface and in a single color (the first in the palette) instead of the placement on the mid-plane with colors following the values. The main purpose is visualization of 2D data, where the current options for visualization of vector fields draw arrows, which are partially hidden behind the surface and the arrows blend with the background when looking from top.
example 5:
option 4:
option 5: