Thomas de Groot <tho### [at] degrootorg> wrote:
>
> ...looking more closely at the macro code, I wonder if something is
> missing to the dir_xy parameter, or to the dir_y parameter more
> probably, as this last one controls the eventual z-location...
>

I agree.

There is a small multiplier value in both equations -- .01 -- that *seems* to
relate to screen percentages (just my guess). I.e., 1-percent. Changing those
even slightly (to .011 for example) shifts the resulting arrow location.
Currently, the values are constants, but I wonder if they need to dynamically
change as the camera angle changes?

I have to admit that some of Norbert's math trickery is beyond me. At the same
time, his code is an instructive lesson in how to use POV-Ray's built-in math
constructs and keywords, and what effects they have. Hopefully, I will learn
some new things-- given enough time!

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