chrisd wrote:matt_one wrote:It would be nice to have a program, not necessarily free, able to create solids (not polygonal meshes), easily deform them and combine them with boolean operations.
Then, only at the end, generate the mesh.
Some nurbs modelers use a concept called cages, which allows modifying a nurbs model with what look like a simplified mesh version of the object. This may or may not use subd surfaces, and superficially it might appear to do the same thing. I believe true subd based controls makes localized adjustments to the model possible (ie adding smaller details). Although I have not used Rhino, I have heard in discussion that it does allow use of cages; however, they are not subd.
You're right, some valid examples are T-Splines plugin for Rhinoceros and Solidworks.
Fusion360 also has T-Splines tools, then there is Catia V5 IMA, but this is too expensive!