Hello George,

find attached a composition that does the z to width conversion. There is a 
factor of 0.55 in the equation which I filled in by try-and-error. Don't ask my 
where this value comes from. Anyone?

Best,

Achim Breidenbach
Boinx Software

Attachment: z vs width.qtz
Description: application/quartzcomposer


On 09.09.2010, at 17:48, George Toledo wrote:

> What kind of equation would be needed to utilize Z coordinates in QC in a way 
> that doesn't change Z translation, but could be used to reduce X/Y scale in a 
> way that makes the object appear to be equivalent size that they would be if 
> translated in Z? In addition, is it possible to emulate the apparent 
> reduction/exaggeration of horizontal or vertical movement of a sprite as it 
> is moved in z by performing math on x/y translations on an object where z 
> isn't at 0?
> 
> Forgetting the x/y translate, it would be nice to know the equation to make a 
> sprite the same size it is at z=-1, z=-2, z=-3 and so on, by manipulating x/y 
> scale for instances when one wants everything to work in only 2 dimensions. 
> The relation isn't linear, and I'm not sure how to back into it.
> 
> If this has been covered, forgive me.
> 
> -George Toledo
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