I have 3 vertices here which I try to align, the bigger User Orth view looks down along the 2 which already are aligned over each other. The upper left view shows a sideview and the arrow represents the axis at which the big view is looking down along.
I'm trying to get the selected vertex inline with the 2 behind it, the problem is that I need to restrain it on 2 different axis which are in different orientation spaces: The main orientation is the big view's camera, 30deg down along that edge. But my problem is that I also need to prevent the vertex from changing it's global z because I want the top surface to stay flat.
What I've managed so far was using vertex snapping with the big view's transform space set to view and locking view z to snap it inline. That'd work fine if it wouldn't still mess with the global z slightly anyways.
So is there any way to align that vertex with the ones behind it but keep that top surface flat?