I am trying to create a curve with crv network with curves I created but it doesn’t work, Is it because of the curves or could it be because of the way I select them? Basically I am trying to replicate the shape on the right. Is there a better way to do otherwise?
That shape cannot be modeled efficiently or effectively modeled as a single NURBS surface in Rhino. (In theory it is possible to model it as a single surface using a large number of control points. However the results would be difficult to modify and could have numerical problems.)
That shape is a good candidate for SubD modeling.
It should be possible to model it as three NURBS surfaces, one for each appendage, connected by blend surfaces. The basic topology of the blend surfaces would be the same as for a Y pipe junction.
if you really need nurbs surfaces you can still convert sub-d to nurbs
if you don t want to use sub-d:
the red, violett and blue part “appendage” need to be modelled first. - if you know how, with suitable curves _loft is an easy way to do it.
hierachically the green part will be the first transition.
the yellow the last. you might get some first results with _blendSrf
Also I am concerned about the amount of “patch” that the subD creates when it is converted to NURBS. Even if the surface looks perfect, how do you apply texture with flow along surface or similar tools that only works on single surface?crv network.3dm (11.5 MB)
SubD surfaces cannot be trimmed or split and retain the shape, so any additional modeling involving trims or splits needs to be done by first converting to NURBS and then modifying the NURBS surfaces.
That is one of the disavantages of starting a model in SubD.
How would you take a single rectangle which could be stretched and shrunk as much as desired and wrap it around the shape so that the entire shape was covered? That is the what is required to create a single parameterization of the shape. Rhino has some tools which can be used to create such a mapping. Rhinoceros Help?