Rendering problem

[godzycabari]

Hi!

 

Sorry if i post under wrong thread, but i have bit of a problem with rendering with V-ray and physical camera...read some previous threads with same problem but none of them didn't solve my problem...basically i built small scene, with vray sky as environment and 2 vray lights as a sky portals...and after rendering all my scene is tinted blue...iv never had that berfore, using same techniques in interior renders..

 

in both images attached i used exactly same vray render settings and both have vray sky in environment slot..hope i will find solution here..thank you all in advance.

[Corey Beaulieu]

Banana,

 

It looks like your glass material is preventing your direct light (Sun) from entering into your space. You should have Affect Shadows ticked on in the Refraction and then be sure to have Color+Alpha selected as well. You will then likely need to raise the F-stop on your camera.

[godzycabari]

Banana,

 

It looks like your glass material is preventing your direct light (Sun) from entering into your space. You should have Affect Shadows ticked on in the Refraction and then be sure to have Color+Alpha selected as well. You will then likely need to raise the F-stop on your camera.

 

Thank you for answering, but there is no glass material in my scene...whole scene is just basic gray vraymaterial...windows are only covered with vray sky portal lights

[Corey Beaulieu]

What is the interior scene you attached then?

 

Do you have a sun at all? Is your Sky map only in the Environment (8) Menu or did you place it in the VRay Environment Overrides?

 

If you use the Overrides you shouldn't need the portals. Portals are for bringing exterior light in without over sampling and you don't have exterior lights really.

[godzycabari]

Okay, i deleted my vray sky portals and it renders normally, but..in my right attachment i'm using sky portals too, with no sun..only vray sky map, and it renders properly, also if i place vraysky in VRay Environment Overrides, it makes my scene blue again.

[Corey Beaulieu]

There is a lo that could be going on here. I would delete all lights and Sky maps from all of the places you have put them.

 

I would then put a Vray Sun in your scene. It should ask if you want a sky in the environment. Say yes. Move the sun into a position that is logical. This means off the ground and at an angle that represents the time of day you are working on.

 

Then on set your camera to use exposure. Leave the white balance to nuetral. Try F = 8; ISO = 160; and Shutter = 50. If this is too bright or too dark only use the F to adjust. Make sure Vignette is off.

 

Once you have this working, then you can add in Skylight portals. I would also add in the glass as it will only make for a better render.

 

I think the problem is that your SkyMap is acting like you have a sun that is set to 0'0" in the Z.

[Ismael]

"The VRaySun and VRaySky are special features which are provided by the V-Ray renderer. Developed to work together, the VRaySun and VRaySky reproduce the real-life Sun and Sky environment of the Earth. Both are coded so that they change their appearance depending on the direction of the VRaySun."

 

http://help.chaosgroup.com/vray/help/150SP1/vraysun_sky_param.htm

 

No Sun may require manual adjustments to the VRaySky parameters if you do not require its defaults.

[godzycabari]

Thank you all, for answering, especially corey, u'v been very helpful.

[Chris MacDonald]

I haven't taken the time to read everyone elses comments, but straight away that you are lighting the scene with a VRay Sky but no VRay sun tells me that is where the blue tint is coming from.

 

It's no different to taking a photograph on an overcast day compared to a sunny day; adjust the white balance and you'll be just fine. The sky (obviously) has a blue hue which VRay is using to light your scene. Usually the presence of the VRay Sun with its yellow hue would counteract this effect and let you render with the default white balance (which I find is still slightly towards the yellow end of the spectrum).

 

The default white balance of 6500K should be adjusted upwards to bring the lighting back to a more neutral white. It is the opposite of dusk/night shots where incandescent lights give everything a yellow/orange hue.

[godzycabari]

I haven't taken the time to read everyone elses comments, but straight away that you are lighting the scene with a VRay Sky but no VRay sun tells me that is where the blue tint is coming from.

 

It's no different to taking a photograph on an overcast day compared to a sunny day; adjust the white balance and you'll be just fine. The sky (obviously) has a blue hue which VRay is using to light your scene. Usually the presence of the VRay Sun with its yellow hue would counteract this effect and let you render with the default white balance (which I find is still slightly towards the yellow end of the spectrum).

 

The default white balance of 6500K should be adjusted upwards to bring the lighting back to a more neutral white. It is the opposite of dusk/night shots where incandescent lights give everything a yellow/orange hue.

 

Yes, but most confusing part for me is that scene on the right picture is rendered with all exact settings...for lightning i use only vraysky with no sun..and vraylights as sky portals and it looks just fine.

[Chris MacDonald]

Ahhh, I didn't even notice the left image! My apologies.

 

Are you absolutely sure you've applied a grey material? The tint you've got in the render seems to match perfectly your wireframe colour. Try changing that to see if it affects the rendered image.

[Ismael]

Compare between scenes:

 

VRayExpousureControl

Physical Camera ( White Balance setting )

V-Ray Environment

 

Over and out.

[godzycabari]

all settings are exactly the same, i double checked them several times, today i turned on the max scene rendered just fine so idk..i guess it's just one of those things... but thank you all for answering and sharing helpful information!