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There is no word "доповить" in russian. And I even cannot understand what do you mean here from context. Maybe it is better to ask in english, if answer of RedFox is not what you want.

It is simple: in russian word "направление" is "vector in space-time".
In physics there is strong difference between "path" and "distance". The same thing is here.
In fact you can use "направить"...

If you talk about "one direction" - it is ok to use it:
"Езжайте в противоположном направлении"
"Направляйтесь прямо по улице" (verb!).
"Я не увидел в каком направлении он уехал".
"В каком...

1. Архитектор, который спроектировал наш дом, умер вчера. (russian has "дизайн" as noun only. So it can be compound: "разработал дизайн". Designers, however, can use informal verb "задизайнил"...