Newb Vray Exterior Setup

[MegaPixel]

I'm new to Vray and using 1.47 full. I'm just playing around with crude shapes and simple materials right now because I'm trying to get a handle on the Lighting and rendering setup.

 

If you look at the attached image, you'll notice that on the building shapes, there are some white out areas towards the upper back, that look like color bleed or heavy light bouncing. I'm trying to figure out what might be causing this. All I am using is a Target Directional light with a Vrayshadow at 1.0 multiplier. No environmental light at all. Renderer is set to Irradiance Map for Bounce 1 and QMC for bounce 2. Color Mapping is Linear. Oh, and there is just a simple Vraymtl on the buildings with a light grey color.

 

Looking for advice on adjustments for better exterior workflows in the future. Thanks to all in advance - MegaPixel

[Geoff]

Reduce the secondary bounce multiplier will help the colour bleed.

As you have hardly any lights but loads of light you may not have turned off max's exposure control off or unchecked the default lights in the global switches.

 

Do a search on the chaos forum for loads of hints and tips. There are tutorials also on the net. Here's one http://lakehao.home.comcast.net/

 

Geoff

[CVC]

actually , the most useful tutorials for vray newbie are here http://osmosis.com.au/info/tutorials.htm !!!

[Christopher Nichols]

First off, lighting in linear space will help you. The first thing that you will realize when you do that is that you are using way to much light, since everything will be blown out. Once you reduce your lighting, you will also reduce your color bleeding a lot, but if you still feel that it is too saturated, reduce the saturation in the GI settings.... reducing the secondary bounce multiplier is a very un-natural way to work.

[AJLynn]

BTW, linear space is different from linear color mapping. Linear space is the method of doing a good gamma correction that involves a curve correction in Vray Frame Buffer. See http://www.cgarchitect.com/vb/showthread.php?t=15766&highlight=gamma+correction

[MegaPixel]

Thank you all very much - The Linear Space concept looks promising, but tricky to learn. I'll give it a go.

 

MegaPixel

[Tim Saunders]

It is tricky to learn. But try one thing at a time to see the results. Like Chris said, reducing your light value will make a huge difference. For a "typical" exterior daytime exterior (without using HDRI), I use a direct light with a value of 0.5-0.7. An always turn on your environment skylight and check "override max's." You have to use V-Ray's environment light to get the best GI results.