On 1-3-2013 22:42, Alain wrote:
> Using the right hand, it require you to twist your arm to have the thumb
> point toward +X, then the index point to +Z
>

Just as an info: The modeller Silo uses the following right-handed 
system coordinate:

X to the right (thumb)
Y up (index)
Z towards viewer/out of screen (middle)

Moray, on the other hand (no pun intended), was right-handed as follows:

X to the right (thumb)
Y towards screen (index)
Z up (middle)

Thomas

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