I have a macro that will transform an object so that it's two 'z' ends
will meet any arbitrary points. If you can use that let me know.


"Matt Moose" <mrr### [at] sphericademoncouk> wrote in message
news:3a90fab8.9496988@news.povray.org...
> (Using Povray v. 3.1g.watcom.win32)
>
> Dear brainy types,
>
> Problem: Got a unit cylinder lying on the x-axis, from x=-0.5 to 0.5,
> with a bitmap projected onto its side in the xz plane. Good so far,
> very happy with that. However I would then like to take the
> illustrated cylinder's start & end points and move them to 2 totally
> different unrelated  coordinates p1 & p2, which can be a variable
> distance apart. The image must face the camera (towards -Z), whatever
> the final orientation of the object.
>
> It's required to keep the image locked to the side of the cylinder so
> it can point in the right direction.
>
> I can easily translate the object's start point to p1, but can't get
> my head around determining the amount of pre-rotation and pre-scaling
> required at the origin in order to move the endpoint to p2,  _and_
> have the image still facing -Z !
>
> Have I missed an easier way?
>
> Thanks in advance,
>
> Matt.

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