Vray and exposure control preview

[frank1331]

I am using Max7 and vray free. ( I know I should upgrade, but its not my call on that one.) Anyway I am trying to use the exposure preview, and when I do all I see is a rendered black box. I get this no matter what type of exposure I try. Am using a single direct light with vray shadows, with GI checked.

 

HELP

[ApeiNe]

Just forget the max exposure control, never use it whith Vray.

Try to get a look at :

Rendering >> Render

Renderer

Color Mapping

 

U got the choice between some exposure right here.

 

If it's only for a preview, make a 300*200 render ^_^

[AJLynn]

I don't think Free does that. But yeah, don't use exposure control, if you're getting black exposure control isn't the problem. Are you using Architectural materials? Those don't work.

[frank1331]

Thanks fir the help. I am using standard materials not architectural, so thats not it. It renders fine whe I render it through vray, I was just wondering why it looks so bad in the exposure preview.

 

This all started when I started to play with an ms script I have that renders each object out individually as a matte/alpha mask. Through the scanline render engine the objects look fine, but when I tried it using vray everything was very dark. So that is when I noticed the enviroment preview render.

 

Does anyone know a way to render out individual objects with a script using vray free?

[ApeiNe]

TO make a Matte/shadow on Vray, just right click on your object >> Vray properties, then check matte surface and affect -1 to the alpha contribution

[FlytE]

Its funny you say never use exposure control.... I always thought the same thing with vray, until a colleague of mine did some vray renders using logarithmic exposure control and they looked lovely. Saying that, they were only white card model renders with a little bit of materiality in them, but they still looked really nice.

[BIG Col]

On the free Vray do you have Light Cache (it's in Indirect Illumination)? If so, this is a pretty useful tool for checking lights and stuff.

When you click on Light Cache have the multiplier at 0.8 and the subdivisions down to 500 rather than the default 1000, this also speeds the render up a bit. It gives you an alsmost instant preview, so you can see what your scenes lighting looks like (pretty much).

Also for speeding up mess around with your Global Switches. Drag a base material as an instance (simple off-white) into the tab next to Override Mtl. and turn on Override Mtl. This renders everything in this material, great for white-card models. For normal renders turn off glossy effects, this speeds things up too.

I think I've waffled on a fair amount now! A little off the subject, but hopefully helpful anyway?!