Hello, Im an ex tsplines user from rhino 5 and now working with SubD, It would be great if there was a similar tool to flatten points or a way to align the control points of my surface to a specific plane or to have them snap with a topology tool to a surface. Also the Radiate tool is still a bit finicky when applying radial symmetry to an sub d mesh that already has Reflect applied.
The interesting thing about the flatten points tool in tsplines is that it would calculate the mean direction/distribution of a set of selected points and would place them on a single plane which came was really handy when you where free modeling and at some point wanted to stablish perfectly flat surface or clean up your mesh.
To do this now im using the set points command but that only works in world axis directions.
About the retopo yeah it was more about retopo snap which allowed you to basically follow a nurbs surface with control points while at the same time building your quads.
you can use gumball to flatten or align points- see this video
one additional thing, you can always make a custom cplane, then set gumball to cplane and then use scale to zero to flatten subd points to a specific plane. also ctrl then click on a handle to rotate the gumball to a specific orientation then scale to zero to flatten.
see 29:27 of this video-
as for the retopo and retopo snaps, this is a work in progress and IMO is not there yet… we’d welcome users of this early tool to give feedback in a dedicated thread so we can get the dev eyes on real world examples so we can make this better.