vray illumination problem...need help¡¡?

[juarez85]

hi guys, i have a problem with the illumination of mi scene it's a very simple scene really but i can't correct the problem, is a bathroom with no interior light sources only a vray sky and vray sun also i use a vray camera, but some objects near the walls act as a light sources, i try fix it by moving the render settings but noting changes, please help me¡¡¡

thanks in advance...

[A.Mitov]

You have vray sky and vray sun but there is almost no illumination in the interior. To compensate for this you may have increased vray sun's intensity so much that it illuminates objects which intersect walls with no thickness.

One way to fix this is to turn off vray sky and place vray lights in your windows so you have optimal light distribution in the interior (vray sky is not efficient for illuminating interior spaces with small windows). After that try adding thickness to the walls.

Edited January 8, 2011 by A.Mitov

[Alyosha]

What he said, put rectangular vray lights in window openings, make sure they are not intersecting glass or anything else, and check "portal" setting in the light settings, which basically means the light will act as a portal to enhance the influence of ambient light from outside thus make it appear more natural as opposed to using an actual light source.

 

Make sure that GI multiplier is not set too high for objects causing your problems (right click object, vray settings, GI settings)

 

Also it's always best to go with box walls not just thin slices it doesnt really take much longer to model them and it's really better in many aspects.

[juarez85]

thanks A. Mitov and Alyosha, y really appreciate yo take the time to read and post to help, finally the problem was something related to the use of vray sky and vray sun y test with other kind of lights like direct target and the problem continues, finally y decided to use a very soft hdri illumination and put a vray light in the windows and also in the ceiling. i never try the use of portal in vray light buy i'll try, thanks for the tip. also y atach the final result, let's see what do you think. C&C allways welcome... have a nice day[ATTACH=CONFIG]40742[/ATTACH][ATTACH=CONFIG]40743[/ATTACH][ATTACH=CONFIG]40744[/ATTACH]

[Alyosha]

ceiling light acts a bit funny, ceiling has shadows on ti while walls are completely white as if you would slice em off (picture 3) - maybe the light is too wide?

 

For a more natural light distribution use portals and tweak materials GI settings. For example if you want more light bouncing from the floor set the floor object to emit more GI in VRAY PROPERTIES of an object. If you don't want it to emit a lot of yellow light, since object is yellow, use override material and in the override material settings use a more pale yellow or white to act as a GI material.

 

Adding lights to windows will not obtain as natural results as easily as portals will and increasing lights intensity is a last resort approach.

 

All in all nice render but light distribution could be more natural.

[juarez85]

thanks Alyosha, i´ll keep trying later and i'll post the results, in fact it was kind of hard to me because i need to finish the scene on monday so i can check with the client. but i know i must keep practicing with the illumination. later i'll post more works so you can tell me what do you think. thank you.

[juarez85]

hey guys, one last question, how can i do this, i mean i know how to use the material override and the vray edge material, y i can´t render a clay or a wire render with the glass material let the light pass like the render of the image, y alway get everything with the material override and the light in interiors cannot pass, or can not see through. please tell me haw i can do this. thanks in advance.