algorithmic modeling for Rhino
Hey there,
I'm having a an issue with the concept invalid surfaces. I'm using a script and i need to cut up an exisiting rhino surface ( not planar) into different smaller pieces using certain parameters. However using Surface Split component I sometimes keep getting and "invalid surface". And I cannot cut up this "invalid surface". Any pointers on how to get a normal surface, or even what this error means ?
Thanks in advance.
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Hi Carlo,
there's all kinds of things that could make a surface (especially a brep) invalid. If you feed the invalid object into the [Null] component, it will tell you why the shape is invalid. It's probably going to be a bit jargony, but if you post the results here I might be able to decipher it.
--
David Rutten
david@mcneel.com
Poprad, Slovakia
Hi again,
This seems to be the problem:
Surface: ON_BREP.m_T[2].m type = ON_BrepTrim::seam but m_iso is not N/E/W/S_iso.
thank in advance
I'm not ignoring, I don't have any new information yet. This is clearly one of our bugs.
Can you post the files I need to replicate this? (and, does it also happen in Rhino5?)
--
David Rutten
david@mcneel.com
Poprad, Slovakia
Hi David, hi Carlo,
i ran into a case that sounds similar and attached an isolated reproduceable bug.
Choosing one specific edge of my Srf, I will constantly get an "invalid" result from the SrfSplit components. All others work fine.
I have no clue how to work around his. All hints welcome! Triming the srf directly with the pipes would be an option, but I don't see an component for that.
Hope this help to get the SrfSplit up and running. Or is there something wrong with the input srf that I don't see?
best ,
frank
other victims of invalid surfaces from split srf,
I just ran into the same problem, Spliting planar surfaces. I found that when I got the Brep edges, it had interior edges. When I baked out the edges It seems the one edge of the surface was not split by the splitting curve. Why? I dunno. This may just be my case, but if this happens the same way for you, It just took a little GH work to resolve that failed split and replace it in the data tree.
I don't have a repeatable file of the bug, but here's a snippet of how I created the split surface from the inavlid. Maybe it helps you apply a similiar fix to your surfaces?
Guy
gh 0.8.0066
when i was getting invalid surfaces from surface split
what worked for me was to use a brep|brep intersection component on my surface that was being split to create a curve. I then used this curve as in input for the surface split component... this still created an invalid surface however i then used the deconstruct a brep component which allowed me to extract my cutting curve as an edge... i then used this edge as an input on another surface split component on the same surface that was being split. this worked.
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