Recently, it happened to involve the design work of the furniture part and produced a simple modeling case. Rhino software is an efficient modeling software for id, but it also has its limitations. Without using the subd plug-in provided by Rhino 7, it is impossible to make flexible products with simple effects such as 3dmax polygon modeling.
According to some of their own experience and online learning tutorials to carry out a simple case analysis, how to use rhino software without the use of subd in the case of rapid production of flexible products.

The production of pillow
Generate a 5th-order control point curve and adjust the control points. In order to facilitate the adjustment of subsequent surfaces, the control points of the symmetrical part are tangent/curvature first.

Adjust the control points after generating the plane

Surface analysis to see if there are surfaces that are not smooth

Cushion part, the production principle is the same as above

Use the control points on the corner to adjust, so that the surface edge becomes the theoretical G1 tangent continuous (can also be adjusted to G2 continuous)

Finally, the step solid model is exported in Rhino software (exposed edge analysis is carried out once before export), chamfer optimization and surface secondary analysis are carried out in ug, and the broken surface of the model is checked after the format conversion process.