In “The Introduction to SubD tools in Rhino v7 Video” (comparing NURBS to SubD), a 4-straight-sided, one face square is used as a SubD object… How is this made, please? (The good video did not elaborate on this finer point). Create SubD plane object or ConvertToSubD, or converting faceted square with Makesubdfriendly, all these make square(s) circular in some fashion, which I would sometimes like to avoid, and instead aim to get the same effect as in the video… https://www.rhino3d.co.uk/rhino-for-windows/an-introduction-to-subd-subdivision-surface-modelling-in-rhino3d-v7/
Question-2 Will one method, preferably, handle all Rhino7- one-face-objects and likewise treat imported face-objects the same way? Are there Rhino- key words to search out possible exceptions of this subject further, (of properly starting SubD-editing with existing planar-one-face objects?
Hello - I do not know how Phil arrived at the SubD plane shown with the sphere, if that is what you are asking about but you can get there with 3dFace > output = subD , pick four points, and use Crease to ‘harden’ the corners.
I am not sure I understand the second question yet…
For question 1, I like SubDLoft between two lines with Corners checked or ExtrudeCrv set to SubD output. SubDivide can be used after to add divisions. There’s also an open request for a corner option to be added to SubDPlane… I’ll nudge it RH-52778.
Questions 2, are you starting with something and want to make it a SubD? If it is a mesh and quads, you can use ToSubD or try QuadRemesh on just about anything.
I am new to Windows and Rhino both and am accustomed to decades of clicking on tools (with preset options) and then drawing objects on a work plane,(and “the plane” was equivalent to a flat sheet of paper on which to draw). If I understand, Rhino uses the term plane as an available object type, and your helpful responses are gradually helping me understanding Rhino.
I copied-pasted Pascal’s command and Rhino generated a circle from a square, followed with the crease command. I then tried Brian’s methods, possibly more direct. Yet I am new and clumsy with command line texting, (and delighted with the auto-filling text there, almost equivalent to short-cut-keys, once learnt).
Question 2 simply refers to years of my past work which provides a scaffolding for future work, so I will add these text commands for reference.