[Qgis-user] What does the "Vector Field Marker" symbol layer stand for?

[DelazJ]

 Hi all,

When setting a symbol for a point layer feature, one of the available
marker symbol type is "vector field marker". It expects some attributes to
be used and some angle/orientation settings but I couldn't figure out what
it is about, what is required for the fields and which rendering I should
expect.

Thanks to anyone who could shed some lights on this...

Harrissou
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