dark spots?

[andriyg81]

Hello everyone. I am just starting with VRAY so hopefully my questions does not sound too stupid. I been doing a series of interiors and everything seems to look fine... but once in a wile i get some dark spots and sploches.... in corners and other darker places of the room. Usually nothing major but they do drive me mad. I use irradiance map with Light cache. I tried increasing different values but usually all i get is much longer rendering times... without much improvement. I decided to make a test scene.. where i manly have reflected light.. and I did get all my spots again. Except on this image they are to extreme and all over the place. I figured it would be a good way to practice removing them. My questions is... when you do get artifacts like this what is the first thing you do? Trying to get a better understanding on how it all works. Thank you

TEST

[Brian Smith]

you will always have splotches when trying to light interior scenes with just exterior lights. you can increase your quality settings to remove them but you would induce really long render times. your best bet is to add a small amount of fill light using the vray light plane. if you get to much illumination in doing so, just use exponential color mapping and decrease the dark multiplier to take away some of the light you added. before you take the light away it will have removed much of the splotchiness.

 

besides this, the main way to remove the splotchiness is to increase the ir map inter samples...up to something like 100. you could also increase light cache inter samples the same way. the high your irradiance map resolution (i.e. the higher the min/max value) the small the splotches will get and the less interpolation you will need. also the higher your hsph subdivs the less you will need but i would never go above 50 because of the insane effect it has on render times

[andriyg81]

thank you very much

I think i finally start to get it

[Zdravko Barisic]

you will always have splotches when trying to light interior scenes with just exterior lights. you can increase your quality settings to remove them but you would induce really long render times. your best bet is to add a small amount of fill light using the vray light plane. if you get to much illumination in doing so, just use exponential color mapping and decrease the dark multiplier to take away some of the light you added. before you take the light away it will have removed much of the splotchiness.

 

besides this, the main way to remove the splotchiness is to increase the ir map inter samples...up to something like 100. you could also increase light cache inter samples the same way. the high your irradiance map resolution (i.e. the higher the min/max value) the small the splotches will get and the less interpolation you will need. also the higher your hsph subdivs the less you will need but i would never go above 50 because of the insane effect it has on render times

 

What do you suggest, a rectanlge vray light on the windows or sphere vray light in centar of room?

If I use HSV Exp with egz: 0.9/1.0 it will remove the ligjht from Vray light?

 

 

Also, what is better way, to have small intesity with "NO DECAY" checked on or bigger intesity with "NO DECAY" checked off?