vray sun cam problem

[fareen]

can some one help me out here its urgent,

 

i am using vray sun and vray cam, and my materials are coming yellow due to the sun i know this is fixed by giving a yellow colour to the cam white balance but its not reducing and if i increase the yellow colour of the cam's white balance the material is turning blue and the objects in shade are still coming yellow is there a perticular rgb value that i have to apply to the cams white balance? someone please reply asap

[Brian Smith]

This is not the answer your looking for so take it with a grain of salt. I highly, highly recommend not using the vray physical camera unless you are an advanced V-Ray user or an intermediate user with a strong background in photography. This is a great feature but unless you know exactly what you are doing and have a strong photography background, you will find it extremely difficult to achieve good results.

[Brian Smith]

This is not the answer your looking for so take it with a grain of salt. I highly, highly recommend not using the vray physical camera unless you are an advanced V-Ray user or an intermediate user with a strong background in photography. This is a great feature but unless you know exactly what you are doing and have a strong photography background, you will find it extremely difficult to achieve good results. You could have an otherwise perfectly illuminated scene that is ruined with poor physical camera settings.

[fareen]

Thank you for ur advice but a due respect i have been using vray for the past 1 and a half years. here is an example of a render i have done with vray sun and vray cam

[fareen]

can anyone help me out with this problem?

[AJLynn]

Maybe for reference you could show us the maps or some way to guage what you think the colors should be?

[Sawyer]

Thank you for ur advice but a due respect i have been using vray for the past 1 and a half years. here is an example of a render i have done with vray sun and vray cam

 

I think Brian's point was more to the fact that using the camera system requires that you know how to use a camera not so much that you are inexperianced with vray. But...

That said I would avoid a white balance correction but thats me. If the sun is too yellow it may be a material fix is better or a setting on the sun is off. Now if you want to use white balance render a white card and use the RGB values of that rendering for the white balance color. Or it could be adjusted in post with a blue filter. Post your image and we could know more.

 

Keep in mind that the color of the light IS yellow and for the most part it is a desired effect. And that the fill is blue so if you remove the yellow there will still be blue.

[AJLynn]

The sun is a bit yellow and the sky is a bit blue and when they play off each other you can get some great lighting.

 

That said, it's possible that what you're seeing (and I'm not, maybe because I don't know what it should look like) is excessive color bleed caused by hyperactive GI brought on by a combination of "physically accurate" sun/sky and non-physical materials. The sun/sky and camera are tricky because they are putting a new level of physical realism on top of a system that is not originally designed for physical accuracy. If you haven't already, you should review the videos here: http://www.chaosgroup.com/forum/phpBB2/viewtopic.php?t=17824 - I've tried the method they describe and it's pretty good once you get used to putting a correction factor on all maps (bitmaps included).

[Koper]

search on google for a white balance color chart, then take that chart and pick the rgb color to the respective time of day that your system is set up to.

 

then if you use the vray sky for your environment you also want to check your turbidity and ozone settings as they realy play a big role in the color of the scene. If your shadows are wrong then the first place I would look at is the ozone settings.

 

hope it helps

[batteryoperatedlettuce]

If you haven't already, you should review the videos here: http://www.chaosgroup.com/forum/phpBB2/viewtopic.php?t=17824 - I've tried the method they describe and it's pretty good once you get used to putting a correction factor on all maps (bitmaps included).

 

I would also very highly reccommend the video tutorial, which can be downloaded at the above link. This method gave me an immediate working solution to a problem I was facing at the time, as well as increasing my understanding of the way Vray calculates color values and the differences between 8bit and float.

[kippu]

it is hard to pull off the vray sun sky and cam combo and if your previous solution worked ..why change ?

but for your question.... you should move onto gamma 2.2 and white correction is something that can be done in post i assume?

[Vince Paske]

Two words - Ozone and Turbidity.

 

http://www.spot3d.com/vray/help/150R1/vraysun_sky_param.htm