Mike Horvath <mik### [at] gmailcom> wrote:
> On 6/25/2019 5:37 PM, Bald Eagle wrote:
> > So unless you're going to store the "original" length of the direction vector,
> > which is going to be derived from look_at and location, you can only ever
> > backtrack to a normalized vector.
>
> Thanks. No, I'm not going to store values.
>
>
> Michael

Why not?   It's done all the time.
For instance:

#ifndef (Screen_Inc_Temp)
#declare Screen_Inc_Temp = version;
#version 3.7;

.....

#version Screen_Inc_Temp;
#end

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