I actually got the idea and code from there, thanks.

I have the feeling that i am missing something with draw_line3d.

The trace should go from the middle of the eyes to 250 quants ahead (X).
The line would then be drawn to let me see the trace.

but the line gets drawn to the right (Y) from the eyes. (i hope the trace does not do too).

I have checked with other models, in case xyz origins different,
but they all do the same thing.

So maybe its my code, that is why i posted to see if anyone can see
a mistake in draw_line3d ?