[x3d-public] Extrusions, take 3

[Alekseyev, Vsevolod (NIH/NIAID) [E]]

Hi X3D community,

I've tried and failed twice to explain the problems with the definition of the Extrusion node. So here's a tl;dr version:

Dear authors of the X3D standard, please take a careful look at the standard and answer me:

1) When the spine goes (0,0,0)-(0,-1,0), what is the CSP?
Note: all answers but one will render one of the reference models in the Savage archive invalid.

2) When the spine goes (0,0,0)-(0,1,0)-(0,0,0), what is the CSP?

3) When the spine goes (0,0,0)-(1,1,0)-(1,1,0)-(1,1,0)-(2,0,0), what is the CSP for the three middle points?
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