Rob;

On Fri, Dec 13, 2013 at 1:51 PM, Robert Ellenberg <rwe...@gmail.com> wrote:

> I spent some time going through the math behind it, and I think blending
> between linear moves with ABCUVW motion is feasible, though it will take a
> a bunch of new data structures to store a 9D vector.
>
> There are two big challenges to making this work. The first is implementing
> a new way to interpolate along a spherical arc (SLERP), since we won't have
> a normal vector….
>

It's been a while since I wrote SLERPing code, but the project I wrote it
for used Quaternions, which I don't think LinuxCNC uses?? Quaternions
certainly made a lot of the internal maths easier. (code was in the
"FreeWRL" VRML/X3D browser)

*Does* LinuxCNC use Quaternions?

John A. Stewart.
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