[Algorithms] R: Sphere to rectangle

[<dri...@li...>]

----Messaggio originale----
Da: dio...@ne...
Data: 08/01/2010 13.45

> Hi all…
>  
> I’ve been wrestling with a problem for some days now, and I 
> honestly can’t seem to figure an elegant solution…
>  
> I want to find the rectangle that bounds a omni light source, 
> so the problem is: given a sphere with center C=(x0,y0,z0) and radius 
RADIUS, what is the bounding rectangle rect=(rx1,ry1,rx2,ry2) on screen?
 
Ok, I read this ML only for educational purpose, so...well, I'm sure I will 
suggest the wrong solution :-D

Arent'you simply trying to do screen-aligned billboarding?
I mean...the bounding rectangle around a sphere of a given radius, on 
screen...is not always the same rectangle simply billboarded?