I saw a video (specifically this: link).
And wondered what a viewsnap is and how to do it.
a viewsnap is setting in-game sensitivity to an extremely high and precise value to perfectly aim a shot or angle, to do a strat with one only really requires knowing the sensitivity for the given route and how to set up the starting angle (typically entering a floor portal, since your yaw gets reset)
with the sst plugin used in runs (see resources) pretty much everyone sets sst_mouse_factor 20 to emulate lowering their mouse dpi so its a little easier
Viewsnaps are highly situational; how you do one depends entirely on what you're trying to do.
In general, if you need to move your camera from angle A to angle B, you first find the difference (i.e. -90 to -43.24 = 46.76) and then divide it by the value of m_yaw, which should always be 0.022 (i.e. 46.76 / 0.022 = 2125.4545)
By setting your sensitivity to that value, your view will move in increments of 46.76 degrees.
This is only useful if you can first find a way to get a consistent viewing angle and position. Again, highly situational.
It was recently discovered that it is possible to set your mouse sensitivity to a value so high that the game considers it infinite, leading to several new glitchy techniques being discovered.
The rules have now been amended to ban these new techniques in both Inbounds No SLA Legacy and Glitchless.