Normal Projection. Question

Hi there,

I always found an answer to my questions regarding gh in this forum,
but this time i couldn't find anything.
So I hope there is someone out there who is willing to help.

I'm trying to project circles ( which i subdivided ) onto two surfaces.
The projection should always be perpendicular to the perspective ( therefore i used the plane normal component). The circles should then orient themselves, regarding the perpendicular plane. So far so good, but as the perspective point gets moved over a certain angle, suddenly the normal plane rotates by 180 degrees and makes the projection useless.
I have no clue how to solve this problem...


thank you in advance!