Hello Professor,
It seems that Rhino has forgotten how to use T-splines (or more likely, I have forgotten). When I try to run T-spline commands, they are “unknown” commands. I made sure that I imported the T-spline toolbar from the appropriate file, but no matter what I do seems to work. Is there any particular reason this happens?
Thanks,
Nathan Hill
– – –
Hi Nathan, Do you have edit mode turned on?  In other words, have you pushed the green tsplines icon that looks like a power button?
– – –
I tried to turn it on with the green power icon but that also gave an “unknown command”. I additionally tried using two other computers, but on each it seemed like T-splines wasn’t even installed; the T-spline toolbar file was absent from the normal file location. I’m not sure if I’m totally missing something or if there is something going on with the program.
– – –
Nathan,

Tsplines only loads and works in the 64 bit Rhino.  If you load the normal looking version from the Start menu that is labelled “Rhinoceros 5.0” Tsplines wont be there.  It DOES however work and will appear if you open the Rhino version titled “Rhinoceros 5.0 (64 bit)”.
– – –
Thanks for this info, Seth.  Can you please provide a basic description of how students can access the 64 bit version of Rhino?  Where can this version of the program be found?
– – –
It’s in the Start Menu where Rhinoceros program is listed.  There are 4 options to choose from: Rhino 64 Bit, Rhino 64 Bit Safe mode, Rhino 5.0, and Rhino 5.0 in Safe Mode.  Rhino 64 Bit is the one you want, the 2 that dont specify 64 bit wont have Tsplines.