"Bald Eagle" <cre### [at] netscapenet> wrote:
> "SecondCup" <nomail@nomail> wrote:
>
> > Nice! The lower image looks good until my code wants it to rotate around the
> > center 360 degrees.
>
> "Until the code I wrote that I think will rotate it around..."
> Don't anthropomorphize POV-Ray, SDL, or your computer.
> Only YOU _want_ something to happen.  Then you follow the rules of the puzzle to
> get the OS to run POV-Ray which interprets the SDL and then makes a Cartesian
> grid of colored pixels.
>
> > Because I tell the code to 'look_at <the center>', the coordinate system isn't
> > doing what I want.
>
> The coordinate system is a static "thing"  It doesn't "do" anything.
> Look_at just determines what direction the camera is pointing when it's at a
> given location ("vector").
>
>
> > Without being locked to viewing the center, the coordinates would be:
> > 6oclock location <0,-15,-65>
> > 3oclock location <65,-15,0>
> > 12oclock location <0,-15,+65>
> > 9oclock location <-65,-15,0>
> >
> > This would create the points on a spleen to rotate around the centre, but my
> > camera wouldnt be focused on the center. The look_at command causes the z-value
> > to act like a zoom-in/out tool.
>
> Those would be the coordinates regardless of where the camera is looking, or if
> there is even a camera at all.   The clock still exists even if a blind man or
> no one at all is looking at it.  (Let's not get into quantum delayed-choice
> gedanken experiments....)
>
> If those are your cardinal points on the clock, go back, draw it out on a piece
> of paper (or preferably on a unit-circle diagram) and then double-check any
> intermediate points you have in your spline.
> An easy way to do this without paper or a spreadsheet or trig, is to just do
> what I just did with the camera path(s) and place some yellow spheres at the
> points where you want the camera to pass through, and see if it lines up with
> where your spline gets interpolated to be.
>
> I would start out with something VERY simple, like your top-down view of a
> clock, with the first 4 points, and then start progressively adding points -
> then you can see where things start to go wrong.
>
> I'm on the road all day today - I'll look at this again some time after I get
> back in, sleep, go to work, get back, etc.  ;)
>
> Good luck   :)


That worked! I quickly tried my coordinates there and it worked. Thanks mate. I
have some stuff to do today myself but once I get my code fully functioning ill
post it here.

Thank you for the advice. It's much appreciated!

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