nortikin/sverchok — pull request #16 by ly29 (2014-01-08 17:30:29+00:00)
Title: Disabled broken function VectorMath and added 2 more Vector functions

So cell_vector is disabled.
And project and reflect.
Project second input vector on the first so you get a parallell vector of the same length as first.
Reflect reflect the first vector using the second. Hint, the second vector could be a surface normal.