Rendering with Iray

roberthutchinson

Every time I render in 4.8 Iray, no matter what the lighting and the intensity, all I get is a very dark image of the scene/model. So what is the trick?:roll:

Richard Haseltine

What are you Render Settings under Environment and Tone Mapping? Is it an indoor or outdoor scene, and if outdoor do you have a geometry-based skydome?

roberthutchinson

The environment setting is dome and scene/infinite sphere. The tone mapping is at defaults..
I have not changed them. The scene is indoors.

Connatic

For an indoor scene try Create/New Photometric Point Light. Position the light and set Luminous Flux parameter to 100,000 and try a render.

Eva1

To get more light, you can decrease the f-stop setting and/or shutter speed setting, or increase the exposure setting (the Tone Mapping settings in Render settings) - this in effect simulates the real world photographic situation of allowing more light into the camera and should brighten your scene. You will most likely need a photometric point or spot light for indoor scenes.

Richard Haseltine

One simple fix is to set the ISO to 400 in Tone Mapping. Also, unless you have windows, you may want to set the Environment mode to Scene only so that Iray isn't wasting time calculating dome light that isn't doing anything useful - even with a single window, if there isn't an outside prop to bounce light in, the dome may be better replaced with a plane having the emissive shader set to match the sky.

roberthutchinson

Thanks for all of the help. I am able to solve the lighting issue with the suggestions from you, but trying to render with Photreal just does not work. I get a quarter of the way thru the render and it stalls and locks up the DAZ Studio. Definitely some issues. I have to use interactive or go back to 3d delight, although the look I want is in IRAdium Photoreal. I see others are experiencing similar, so I will just wait for fixes to come out.

roberthutchinson

The Sultry Lady said:

Thanks for all of the help. I am able to solve the lighting issue with the suggestions from you, but trying to render with Photreal just does not work. I get a quarter of the way thru the render and it stalls and locks up the DAZ Studio. Definitely some issues. I have to use interactive or go back to 3d delight, although the look I want is in IRAdium Photoreal. I see others are experiencing similar, so I will just wait for fixes to come out.

So, with some experimentation, I have found that the culprit is the Photreal setting in the render settings. This is the setting where my rendering stops and DAZ locks up. If I use the Interactive setting, my render completes, after about 4000 interactions. No lockups and the render looks OK. If anyone can shed any light on this, let me know. Attached is a render finished with the interactive render setting.

Connatic

Try changing Instancing Optimization from Memory to Speed.

roberthutchinson

Connatic said:

Try changing Instancing Optimization from Memory to Speed.

That did the trick; changing the setting from memory to speed. I wonder if this means that my machine should have more memory? My video card has 2 gb. Thanks.