[Radiance-general] Horizontal artifacts in large image

[Georg Mischler]

Mark Stock wrote:

> Fellow Radiance users,
>
> I recently completed a large image (1.4 GB .pic file, 16k
> by 24k pixels), and it appears like there are two obvious
> horizontal bands of incorrect values (one 30% from the top,
> the other ~80% from the top). I pfilt'd the image down to
> 5% of it's original size to make the image below:
>
> http://mark.technolope.org/image/p21c_fish_take_3/redo_smooth_6/timg10_1_tw.jpg

Scary...


> The commands that I ran were:
>
> rpict -x 16000 -y 24000 -vta -vp 0.2 0.2 -0.01 -vd 0.454 0.891 -0.08
> -vu 0 0 1 -vh 58.66667 -vv 88 -ab 1 -aa 0 -ad 16 -as 0 -dv -ds 0.1
> -dj 1.0 -t 600 -o img10_1.pic real.oct


Looks like the simulation got killed and restarted at those points.
And since you're not using an ambient file, that will necessarily
produce discontinuities in the diffuse lighting before and after.

You appear to have plenty of disk space, so I'd recommend to
use an ambient file. You may want to play with the ambient
resolution as well if you do this, to keep the size of that
file under control.


-schorsch

-- 
Georg Mischler  --  simulations developer  --  schorsch at schorsch com
+schorsch.com+  --  lighting design tools  --  http://www.schorsch.com/