Having Trouble rendering with Iray (Lighting issue)

sjjesso_78ca0e6d0c

I have no idea what I'm doing wrong. With 3Delight all I had to do was apply a lighting setting and render. With Iray no matter what Lighting setting I use, including Iray lighting, everything renders too dark or completely black. Especially with interior settings.

If it's easier with 3Delight why am I not using it? Because every new product requires that you render with Iray.

I've tried looking up tutorials but it seems I have to jump though hoops to get it to work. Adjust this, turn this off, turn this on, that sort of thing. Is there a better and easier way or am I just screwed?

Gordig

Iray is an unbiased render, meaning that it emulates physical lights. The default settings are for outdoor scenes, so you can generally just slap an outdoors HDRI and get decent lighting. For interior scenes, you'll need to either lower the exposure value in render settings, increase the light, or a combination of the two. 

sjjesso_78ca0e6d0c

Gordig said:

For interior scenes, you'll need to either lower the exposure value in render settings, increase the light, or a combination of the two. 

 

I've been looking around in the render settings but I don't see anything for increasing light or lowering exposer value. I've tried looking it up and so far I haven't found much, other than I'm not the only one having this issue. There have been a lot of people having problems using Iray and the issue has been consistantly that it renderes too dark.

 

prixat

I don't think there is a generic solution or a "light set" like we had with 3delight. Doesn't the product have an adjustment for lighting?

You will have to get more specific with the product are you working with.

The Exposure settings are in "Tonemapping" reduce the value to brighten the image.

 

sjjesso_78ca0e6d0c

Uber Enviroment. ALR for Iray. IRAY HDR Outdoor Enviroments. I've tried adjusting the values as instructed and I've ended up with the same results. When dealing with IRAY it's always been a frustrating venture and were it not for the fact I can't find a 360 camera for 3Delight I wouldn't be using it at all. Hell, even the new figures that look amazing use IRAY Texture only.

prixat

Uber Environment is 3Delight only, it will block the Iray Dome making everything black.

TimberWolf

Out of the box, the Daz implementation of Iray will just simply work without you doing anything else unless, as Prixat says, you have a 3DL product loaded which uses a skydome or Uber Environment. Many of Stonemason's earlier products fit this category but render superbly in Iray once the dome is gone. You will have to hide or delete that to get Iray to render as it's effectively placing an opaque dome over your scene which is impervious to light.

To get the best out of Iray requires an understanding of the Tone Mapping options and, sometimes, the materials configuration of your assets but the results are far better than Studio's implementation of 3DL

It really would help if we knew what product you are trying to use.

TBorNot

The default lray light is far too dim, it's there, but it doesn't do much.  You are looking for "Luminous Flux", which is always set to 1500.  For example with a spotlight, crank it up to around 250,000.  No, you can't set a default, but I save a light as a Scene Subset and bring it in when I need it, for convenience.

 

PerttiA

TBorNot said:

The default lray light is far too dim, it's there, but it doesn't do much.  You are looking for "Luminous Flux", which is always set to 1500.  For example with a spotlight, crank it up to around 250,000.  No, you can't set a default, but I save a light as a Scene Subset and bring it in when I need it, for convenience.

If the 1500 is lumens, it's spot on correct.

Why does it look dim in DS, is because the default rendering settings are meant for very bright exterior scenes.
If you are working with interior scenes, set the "cm^2 factor" to 10 and ISO to 400 to start with and check what you get.