wierd shadows on flat surfaces (possible simple fix)

[dave_C]

Im in the process of teaching myself VRay and have hit a little snag.

iv been at this all day, and its driving me up the wall.

 

I tried to render off a WIP image of this interior and im getting a strange textured appearance on what should be perfectly flat white walls

 

The textures are both max defaults (for test render) one white for most of the model, one white at 20% opacity for glass and it has a VRay sun, with VRay sky in env slot

 

can anyone tell me what im doing wrong?

and how to fix it?

 

massive thanks to anyone who can.

[viv_arun]

according to me , i feel these weird shadows and blotches appear because of not sufficient light entering the room.

increase the glass transparency further ,add vray plane light at the window.

if you are using vray phy camera then try f8,iso 60,shutter speed 120.

 

in ur settings,

i would tweak a bit.

 

try adaptive sub div with catmul rom

in color mapping check sub pixel mapping,clamp output,affect background.

try with hight light cache sub div .around 600

 

cheers!

[Joseph Petrino]

Your irradience map setting is "low".

 

Low means blotchy renders and fast render times.

 

edit: Your lightcache setting is also very low.

Edited October 5, 2009 by Joseph Petrino

[wILDaRTIST]

U should try changing the "HSph. subdivs" value to 25 or more

what ever resolves the issue

"HSph. subdivs" can be found in the irradiance map rollout.

 

please confirm if that helped

[Tommy L]

also change the lightcache to 'screen' instead of 'world'.

[dave_C]

just so you know this is a very short animation piece hence having it on world rather than screen

 

i rendered off with much higher settings than previously posted and im still having issues

 

BIG thanks for all the help so far, the render has improved massively

still more help needed with this though, thanks

 

if you want to see what happening now if you go to youtube and type in "Test render4" im scavangereight it should be the first one, would post a link but not allowed to

 

thanks

[dave_C]

update: i found that rendering out to targa improved (although didnt solve) the situation, no funny shadows but the whole room is flickering up and down in light levels