[Radiance-general] Rendering fields

[Greg Ward]

Hi lebele,

I don't have a beautiful solution for this, but the following should  
work:

rlam '\!vwrays -vf view1.vp -pa 0 -x 2880 -y 2304' '\!vwrays -vf  
view2.vp -pa 0 -x 2880 -y 2304' \
     | rcalc -e 'odd=recno-floor(recno/2)*2-.5' -e '$1=if(odd,$1,$7); 
$2=if(odd,$2,$8);$3=if(odd,$3,$9)' \
         -e '$4=if(odd,$4,$10);$5=if(odd,$5,$11);$6=if(odd,$6,$12)' \
     | rtrace -fad (etc.)

The rlam command puts rays corresponding to your two views on each  
line together, and rcalc chooses between them based on scanline  
oddity.  This requires a lot of ASCII/double conversions, which can  
be slow, but since rlam doesn't handle binary floats or doubles, this  
is the simplest way.  A more complex solution that could write  
doubles directly would use rcalc alone and two view calculations, but  
I don't have time to write that one for you.

-Greg

> From: atelier iebele abel <atelier at iebele.nl>
> Date: July 5, 2005 2:39:19 AM PDT
>
> Hi,
>
> Working on an animation for video/tv, I need to render fields.  
> Instead of rendering two frames apart and composit both into one  
> image with fields later, I am thinking about a solution in wich I  
> render two viewpoints in one image directly.
> In this image all even scanlines should show view01 and all odd  
> scanlines should show view 2 (or in reverse order, I dont know yet).
>
> Currently I work with the following command to render my animation  
> with:
> vwrays -fd -vf view8_0001.vp -pa 0 -x 2880 -y 2304 | rtrace -av 20  
> 20 20 -ab 0 -st 0.01  -x $1  -y $1 -fdd -ovpN model-ani.oct
>
> I think it should be possible to extend this command in order to  
> fit my need, but I don't know where to start.
>
> An example of the result I like to achieve can be found on http:// 
> www.toren.com/radiance/fields.jpg
>
> Iebele