Upgrade from 4.8 to 4.9, Iray renders very dark

paphus

I upgrade from 4.8 to 4.9 yesterday, and for the exact same file the Iray renders are way darker than 4.8. Anyone know how to get it to look like 4.8?

I find Iray extreamly dark in general I use the Daz3D Promo Scene lighting with all the light doubled, and an extra distant light at 180% just to get renders light enough.  Some lighting would be almost all white in 3Delight, why is lighting so dark?

Render is of basic Michael 6 face using default Iray render settings.  I started a set on animation renders in 4.8, and really don't want to have to redue them from scratch since each frame takes over an hour to render, so please help.

Also, for the same file it takes 10 minutes to render using 3Deligeht, but over an hour with Iray (either version).  I like the quality of Iray, but hard to justify 10 times more render time, anyone know how to make Iray faster? 100 frame animation takes a week to render...

 

Khory

How are you setting your Tone mapping? And did you adjust the Iray skin settings to take into account the fix to translucence/sss handling that was done in 4.9?

fastbike1

I'm not seeing any change in brightness between 4.8 and 4.9 for the same settings.

Iray isn't 3Delight. Settings etc are all different. If you want fast Iray renders you need an Nvidia graphics cards that has Cuda cores and sufficient Vram. You renders will then be much much faster than 3DL.

paphus

No idea on tone mapping, or how to adjust skin settings.  I'm using very basics, just the default Iray render settings.

If I delete my Promo Scene lighting and distant light (then it uses headlamp is assume) then the lighting in not so dark, but still different than my previous renders.

Khory

The main change was to the surface settings. Daz has been updating the skins they own but it is a toss up as to if/when that will happen for PA products. The simplest think to brighten a render without adjusting the lights is to go to the render settings tab, select Tone mapping from the list and then increase the Film IOS. Start with 200 and see if that helps light wise. I also suspect that your using lights created for 3dl rather than iray and that may be slowing down your renders. For outdoor images HDRI or sun sky should give you the fastest renders. Interior shots tend to go somewhat faster if you have more rather than fewer lights. Maybe post an image of what your trying to match?

paphus

Thank for the help.

I'm trying to match the image on the left in the first post attachement.  It uses the lights that I think I got with the Micah Hair product,

http://www.daz3d.com/forums/discussion/67645/leyton-hair-promo-lights

it was designed for 3dl, but still was looking good for Iray in 4.8 (although slow to render).

I did a render with no lighting, just the default head lamp I assume, it looks ok, but doesn't match my previous renders.

What lighting would you recommend for Iray, looking for potraits for virtual agents, i.e. http://www.botlibre.com/avatar?id=12058726

I'll try increasing the film IOS, thanks, but it will be difficult to match the lighting from 4.8 I assume...

 

>>  If you want fast Iray renders you need an Nvidia graphics cards that has Cuda cores and sufficient Vram

My video card is NVIDIA GeForce GTS 450 4g

The renders without the lighting are faster, but still much slower than 3dl

Khory

I suspect that your stacking the deck against faster renders. Any time the program has to think and convert on the fly it slows things down a bit. Not having proper iray lights means it has to think things through not to mention that Iray thinks about light very differently than 3dl. Did you apply iray settings for the character? Though if your trying to match other work that may not help.. Hrmm.. 

If your doing just the portraits like the one there and in the link I would think that your best bet would be a fairly simple neutral HDRI image and perhaps a spot that is angled down and from one side slight. You wouldn't need a very bright one but it would give you some defining shadow without having them be too harsh. Or perhaps mid afternoon sun sky lighting.

greggdilorenzo

How does one get 4.9 on their machine? I looked through the newly created install manager and didn't find it. The package started a install to 4.6 which I cancelled. 

fixmypcmike

Using Daz Install Manager, click the Refresh button at the top and the latest version sh0uld appear in the Ready to Download tab.

greggdilorenzo

Cancel that last comment I found it on the list.