well i was just using that gif as a general example. its not a matter of "hey im looking for a way to make a 45 degree segment on a cylinder" but moreso of i need a way to move, rotate, and scale, a segment or set of vertices without breaking my mesh's silhouette or edgeflow. there's tons of situations when i need…
Hmmm I don't know if default Maya can do that, so you might need to look for a script. If I needed a shape like that I would use the "cut faces tool" under the edit mesh tab. It basically lets you draw an edge through everything like if you were slicing it, so that might work for you. Example below.
The Bevel tool is all sorts of fucked up, and is one of the most requested things to be updated on the Maya feedback site. For the 1st example use offset edge loop on that loop going down the center. For the second I would use split edge ring tool with "equal distance from edge" checked. It would be cool if there was a…