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We are currently trying to generalize our geomtric representation to allow for Nurbs, Tsplines and Subdivision surfaces and that is where the problems start… If i’m correct, there is no standard Tspline format and Tsplines are not natively supported by any CAD Software, but only via pluigins? The procedure is somehow similar to the IGAFEM and IGABEM, but we need the geomtric information to be pushed to our drawing OpenGl/Tesselation interface at interactive framerates.

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Honestly I’m not sure how open to licensing it is, but if you do license it I have code which will read T-splines out of 3dms.Īctually we want to use the tsplines not for creating geometries or in a CAD context - but for simulations (elastodynamic, fluid dynamic a.s.o) wiith the possibility of user interaction. If you’re trying to do much more than that with T-splines then you will probably want to talk with Matt Sederberg about licensing the tslib library. The ON_Mesh is the same as the control cage - there is n-gon information if necessary, but that is standard in ON_Meshes now. The ON_Brep is a conversion of the T-spline, so if you’re just looking for display, then that would be sufficient. In a 3dm file, the T-spline data is stored as UserData attached to either an ON_Brep or an ON_Mesh, depending on whether you’re in box mode or smooth mode when you save. What are you trying to do with the T-spline data? Are you able to read. However, you may or may not need to deal with all that stuff. Anyhow, it’s nice for end users, but the storage mechanism is quite complex at this point.

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Specifically, we went through lots of different variations for how to store t-spline data in a 3dm, and 2.x was backwards compatible with 1.x files, and 3.x is backwards compatible to 2.x files. T-spline surfaces are simple and intuitive and it’s really easy to iterate through a number of different options.So, it is possible to extract the t-spline data out of a 3dm. The Freeform tools are really helpful when you want to throw down an organic surface without having to spend lot of time planning and executing individual surface patches. The slight downside to this is that the constant checking is compute intensive, and might mean that you need a more powerful computer to make best use of T-Splines. If your operation will cause the Brep to fail, Inventor will warn you. The constant checking of the Brep surface means that Inventor can give you some pretty good feedback on your T-Splines surface as you work on it. This means that the Brep model is instantly available as soon as you leave the Freeform environment. Instead of converting to a Brep on command, Inventor constantly calculates the T-splines surface in the background. One big difference is how the Inventor implementation handles conversion to Brep’s. What you get in Inventor 2015 is the most basic set of tools that make Freeform modelling practical. The Freeform toolset in Inventor 2015 is the very first implementation of T-Splines inside inventor, so not all the tools from the original Rhino version have been ported over yet.

How is Freeform different to T-Splines in Rhino or Fusion 360? They are not parametric and there is no History (Apart from the UNDO tool!). Freeform surface models are edited using direct manipulation. How is Freeform different other Inventor tools?įreeform in Inventor 2015 is actually a completely separate modelling environment.

This really helps Inventor to process the T-Splines surface quickly when we want to convert our Freeform model back into a Brep solid. The ability to add more control points and more control splines in a limited area is really helpful in allow us to add detail, without adding mathematical complexity to the surface.

More Autodesk Inventor T-Splines tutorials

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You can see T-Splines subdividing faces in this excerpt from my Video tutorial series ‘ Mastering Inventor T-splines‘. The clever bit about SubD modelling in T-splines is that you can subdivide individual faces, so that you only need to add complexity to your surface where you want additional detail.

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