On Tue, 4 Dec 2001 16:27:34 -0500, Bill DeWitt wrote:
> 
> "Ron Parker" <ron### [at] povrayorg> wrote :
>> >
>> >     But ... but.. how do you see through the graph paper?
>>
>> I just use a sharpie to draw the lines right on the screen.
> 
>     I've done that. Mostly marking positions during an animation.

I usually use electrical tape for that; it comes off easier.  I taught
my son that trick for video games, too, so he'd know just exactly which
point on the screen to jump/shoot/whatever from when going up against 
some obstacle or other.

-- 
#macro R(L P)sphere{L F}cylinder{L P F}#end#macro P(V)merge{R(z+a z)R(-z a-z)R(a
-z-z-z a+z)torus{1F clipped_by{plane{a 0}}}translate V}#end#macro Z(a F T)merge{
P(z+a)P(z-a)R(-z-z-x a)pigment{rgbt 1}hollow interior{media{emission T}}finish{
reflection.1}}#end Z(-x-x.2y)Z(-x-x.4x)camera{location z*-10rotate x*90}

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