Patrick,

The issue of precision had occurred to me but I thought it too much to
mention and complicate any discussions, but I'm sure that you're right in
that it could be dealt with using some mechanism especially considering that
most copying of objects between scenes would be done at typically the same
rough order of magnitude of scale.    I just didn't want to add that level
of complexity.



Also I might mention (at great risk!) that if this was incorporated, then it
might also be conceivable that textures could be designed either unitised or
have a "designed for" type setting that would allow the (optional) automatic
scaling of textures such as wood to the target scene, or auto scale to the
target "'base' 1 unit scale" possibility you mentioned.   Again, I've not
mentioned this previously, as this would raise complexity when all I want is
to be able to cut and paste a desk and chair and all its associated items
from one scene to another regardless of scale, metrification or
 "imperialism" and lazily not have to re-scale.

"Patrick Elliott" <sha### [at] hotmailcom> wrote in message
news:MPG.19b57896a4efe84198987c@news.povray.org...
> Actually.. It might be nice to have such a definition built in, but I
> would make it so that you have a default set of associations, but you can
> specify in the SDL a different value for one of them and have POV-Ray
> adjust all the rest to fit. The one thing Alan seems to have completely
> overlooked is that when you start dealing with something beyond a certain
> scale, either too small or two big, then the decimal places needed to
> deal with it become to imprecise to get it to work right. You need to
> have some way to adjust the scale so that if you are dealing with
> something on microscopic scales or solar system ones you can set your
> 'base' 1 unit scale at some reasonable level where precision errors won't
> screw up the scene (or make it flat out impossible).
>
>
> -- 
> void main () {

>     call functional_code()
>   else
>     call crash_windows();
> }

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