Half rendered image is black...

aci · Post by **aci** » Mon Sep 03, 2007 10:03 am

Hye !

I'm new on Kray and when I render a frame, the second half of the rendered image is black... Do you have some ideas to help me ?

However, the reflection in the mirror (cf salon-bug.jpg) looks very strange... How can I fix these artifacts ?

Thanks'

Post by **jure** » Mon Sep 03, 2007 12:47 pm

Yup, it's a known bug which will be fixed in OB4.
Workaround is to add dither simple; to header command.

aci · Post by **aci** » Mon Sep 03, 2007 2:30 pm

Thanks' I'll test this setting right now !

For the "black region" of the render, is it a bug relative to LW's resolution multiplier (50%, 25%) ? I've tested with 50% and 50 % of my render is black, but with 100% my render is ok (no black)...

Post by **jure** » Mon Sep 03, 2007 3:00 pm

No i don't think it's related to resolution multiplier.

Post by **silverlw** » Mon Sep 03, 2007 6:15 pm

Wow! Spectacular image, shame the bug spoiled it. In OB4 it is fixed.
The reflection in the mirror is the irradiancemap ONLY. "Blurring accuracy limit" controlls this and when set to Zero, only the irradiancemap will be used as a reflectionmap. One way is to use higher Values like 100%, that's accurate but rather slow. Another way to deal with it is to make the irradiancemap better without splotches by increasing N-value in photontab until it's smoother and more suitable to be used as a refletionmap.

Post by **jure** » Mon Sep 03, 2007 6:47 pm

and another (more common) way is to increase accuracy limit to something more than the blur amount your mirror has. Or turn off reflection blurring on the mirror - mirrors are almost perfectly reflective anyways.

www.kraytracing.com