Over exposed white

[Neshi]

Hi there,

I'm hoping you don't mind helping out a complete beginner of V-Ray or rendering in general.
I have made a plan, imported it to sketchup and dropped house models on it (blocks) and I try to render it.
However, as you can see in the image, the whites of the houses is quite overexposed on the (sun) north side. It's almost positively glowing.
Making the material a different colour does not work, there is still like a glow on the northside of the models. Does anyone know how I can avoid this? I'd like to keep the houses white.

[kenancakir]

You have to apply some materials on sketchup's default white areas, i suggest grey tons.. If that not helps, try reducing sun's intensity or change the exposure value in camera..

[Neshi]

You have to apply some materials on sketchup's default white areas, i suggest grey tons.. If that not helps, try reducing sun's intensity or change the exposure value in camera..

Thanks for the reply.
However, I have tried applying other colours. This is with white applied, but even when I apply grey there is a similar whitish wash in the direction of the sun.
Reducing the sun intensity just makes it less pronounced, but it is still there.

Can this be something to do with sun reflection?

[kenancakir]

You can use frame buffer post production exposure option, pull the middle slider to the left until you like it..

[Zahari.Ivanov]

Hello Neshi ,

This is happening due to the material being pure (or nearly pure) white in combination with the GI bounces, creating the overexposure effect. In order to prevent it (as well as a few other similar issues), it is best to avoid using pure white color in your materials.

However, if you would like to keep the color of the houses white, I would like to propose a solution. Create two Generic materials, where the Diffuse color of one of them white and on the other - black. After that, create an Override material and in the Parameters, place the white Generic material in the Base Material slot and the black Generic material in the GI slot. Apply the newly created Override material to the houses and start a render.

Please let me know how this turned out and if the result meets your expectations.

[Neshi]

Hello Neshi ,

This is happening due to the material being pure (or nearly pure) white in combination with the GI bounces, creating the overexposure effect. In order to prevent it (as well as a few other similar issues), it is best to avoid using pure white color in your materials.

However, if you would like to keep the color of the houses white, I would like to propose a solution. Create two Generic materials, where the Diffuse color of one of them white and on the other - black. After that, create an Override material and in the Parameters, place the white Generic material in the Base Material slot and the black Generic material in the GI slot. Apply the newly created Override material to the houses and start a render.

Please let me know how this turned out and if the result meets your expectations.

Hi Zahari,

First of, apologies for the late reply. Things got hectic at work and we're working to a budget, not really allowing me to spend more time on this job.
Thank you so much for your clear response. I've applied it and it works wonders, the effect is gone completely.

Big thanks to everyone trying to help. Slowly but surely I'm discovering all the details and minutiae of working with VRay and modeling / rendering.