Trimming, cut, etc. in T-Splines?

[Johnny]

Is there anything like those Rhino commands in T-splines?
(I had to trim the object in Rhino but it can't be converted to T-splines).

Thank's!
Johnny

[Eduard]

Hi, if you download the manual :

http://www.tsplines.com/resources/manual/TSplines3ManualJune13-2011.zip

then there on page 57 is how can you trim t splines

[Johnny]

Well, that's not quite what I'm looking for.
T-splines trimming seems to leave the inside part empty – and makes A LOT of faces outside (I need the inside version). Rhino trimming just split's the shape along the curve. Not extra faces, etc.


That would be a good feature in next T-splines version – or/and the possibility to convert trimmed Rhino shapes

Thank's for the tip anyway, Eduard!

[TomFinnigan]

I think you can use the same procedure to get the inside surface..

We've looked at doing trimming with t-splines, and the way we'd like to do it is somewhat complex. In most trimmed models, if you have more than one nurbs surface, you can't really move control points without causing cracks to appear - Rhino typically just doesn't allow you to turn on control points.

We'd like users to be able to use all of the t-spline tools to push and pull, extrude, uncrease, etc. So, we're waiting to be able to get a full solution rather than something that only works on one surface, or that you can't move control points or use other t-spline commands on.

In the meantime, there are two workflows that I've seen people use successfully. One is to do like Eduard posted. More common is to leave the surface without any trims, and then trim after t-spline modeling has been pretty much finished - so for example, model the main for with t-splines, and then add parting lines, ribs, bosses, screw holes, etc. after you've converted the t-spline to a Rhino polysurf.

It might be that neither of those work for your case, but figured I'd mention the reasoning behind the conspicuous lack of trimming, and the two workflows..

[Johnny]

Ok. Have to look at the T-splines 'trimming' again. Thank's for correcting!

By the way, I'm pretty new in Rhino and T-splines so there are a lot of qualities I don't know yet. But so far there is one interesting thing which would be nice to have in T-splines (or is it there already?):
Kind of a 'magnetic' button. We have the 'weight command' for control points, but I'm looking for something similar with curves/lines. Many of us do the curve lay-out first and then begin to build the solid. The original curves are normally left untouchable.
Result: the final shape is not always exactly the same as the original curves.
(As an adjustement) with 'magnetic' button You could activate the original curve and the T-splines edge and decide how close they would really get to each other - if nesessary. You could have the exact shape you want.

Of course, there would be many other situations where that type of quality would be needed as well.

BUT - like I said - I don't know if there already is something like that!

[TomFinnigan]

tsMatch is probably the closest think to what you're looking for - it only works one curve at a time, but you can match your t-spline to within file tolerance, or specify a tolerance, and it'll add new control points as necessary to meet that tolerance.

[Johnny]

I don't konw if the 'match' is quite like that...
When you have the solid ready, nothing 'open' anymore, no more walls to build, THEN the (magnetic) button would be especially usefull. You could activate the edge which is more far away from the original curve and get them (edge and curve) closer to each other. Only the edge would move, of course.
In organic modeling that wouldn't be so important (propably), but with exact shape it would be VERY useful - and save a lot of time.

Johnny

[Adam Helps]

Be aware that tsMatch works on the isocurves interior to the surface as well as the surface borders. So you can use it on closed shapes as well.

[Johnny]

Ok.
I quess it's still an 'on-off' possibility?
(not possibile to choose the level of the effect).

Thank's for letting me know!

Johnny