My lighting not rendered with nvidia iray

nicholasstedman1_edfae500ea

When I render with nvidia iray the lighting of the scene seems to revert to a default lighting completely different from the way I have lit the scene. When I render with 3Delight there is no problem - the render respects my own lighting. 

 

(PS I have also noticed that since I updated DAZ£D yesterday in the render smart content there is an exclamation mark in the icons for Iray advanced settings and sun dial set - I don't know if that has anything to with the above problem)

nicholasstedman1_edfae500ea

In the attached file the shadow is cast by my main light - the figure however is not lit by this light but by another "default?" light coming from the right. How do I switch off this default lighting

R25S

What Light du you use?

Maybe it is a light set that is made for 3Delight and not for iray. Iray uses differnt light than 3Delight.

Fishtales

Did you switch off the Headlamp on the camera?

nicholasstedman1_edfae500ea

Thanks for your comments - I did try with the headlamp turned off but this didn't change anything - I think this is turned offf automatically anyway when you light the scene

I am just using two distant lights at the moment with the main light from above. Rendering in Iray I do get a shadow that corresponds to my lighting but the actual light on the figure comes from the right. It looks very odd. I get the same "default" Iray render on all my other figures in my other scenes and can't use my own lighting at the moment.

 

 

Fishtales

Is Environment set to Scene Only? If not then the Dome will be adding light to the scene.

nicholasstedman1_edfae500ea

With Scene Only the figure is just a black silhouette! with the black shadow of my light.underneath.  It seems then that my lighting is simply not being rendered at all. The same happens when I start a new scene with one figure and 1 light

I have dis-installed and reinstalled the program to no avail. PS Everything was OK yesterday

 

Thanks for your help

 

Fishtales

If you switch off the two Distant lights what does that do to the render?

nicholasstedman1_edfae500ea

I get the same render as before without the shadow (i.e. with the light from the Dome)

Fishtales

What are the Environment, Tone Mapping and Distant Light settings? Screen captures would help.

nicholasstedman1_edfae500ea

I have attached screen captures

Fishtales

Is there an image in the Environment Map? If not what are the Sun and Sky settings?

nicholasstedman1_edfae500ea

yes there is a small image of an out of focus castle and sky in the Ensironment Map

mjc1016

It looks like your tone mapping is set to the default values...which are great for a bright sunny day. 

You have two choices...crank up the Luminous Flux value of the light (by a huge amount) or adjust at least the Film Speed (ISO) to minimum 400, Shutter Speed to something like to 8 or less and/or drop the f-stop to 2.8 or 4.    Or do a combination of both...more light AND camera settings.

nicholasstedman1_edfae500ea

well many thanks - that seems to have worked! (but I don't see how or why? I havn't modified any of thse parameters since yesterday so why should I suddenly have to change these values) Is there a light intensity button for my lights that would doo the same thing

Fishtales

Is one of the Distant Lights off to the right? It may be that in this instance it is too bright. Try turning it down to 2% and see what that does, either that or lower the Lumens to 100 and then bring whichever one you lower back up slowly if the figure goes black.