My render times are getting longer and my renders worse

joonaoskarivesa

 

 

AJ2112

Less lighting increase render times in most scenes.  Depending upon computer and video card power, some renders can take hours.  In 2nd image try adding some soft light towards figures face    

Tobor

From appearances, the second one is poor because the character is entirely (or nearly entirely) lit with indirect light. This will cause Iray to process the scene for much longer.

As Awesomefb notes, you can often help this situation simply by adding a light for the character. 

Jimbow

Try switching on the Architectural Sampler to see if it handles the scene better, as it's designed for the kind of scene you appear to have set up. It might look like it's taking longer to render to begin with, but convergence happens more rapidly as the render progresses. Also, render at three four times the final size you want and reduce the image size later on - the principle is that the convergence goes at the same rate, but because your'e rendering much larger it's like you're subsampling the convergence and the reduction gets rid of noise and fireflies (I find I can render to 10% convergence without any distinctive noise at final resolution). I also switch off the firefly filter and render at zero quality.

Toonces

Definitely a lighting issue. I'd say both have problems.

The first render has too much direct light. The shadows are too sharp, making it look like the character is outside on a sunny day (although if she's sitting right beside a window, it would make sense).

The second render has too little light, and yes, it'll take forever since Iray has to work harder. For indoor scenes, I personally recommend mesh lights (ghost light product is awesome), but you can use whatever, just make sure the majority of the image is decently lit for performance improvements.

gederix

You kinda have to approach lighting scenes as if you are staging in a studio rather than emulaing reality. A camera does not see like the human eye so dont try to light your scene by only putting lights where they 'really are', like say a light from a lamp and the sun coming thru the window and thats it. So for the second scene above, really I thing one more light on her face as mentioned above. You should always have one light on a subjects face to generate catch lights in the eyes anyway. Unless you are using baked in reflections, which you shouldnt if youre using iray or reality.

LiquidWarehouse

In Render setting there are settings for controlling ISO and shutter speed under Tone Mapping. With Iray you need to think like a photographer in terms of light and exposure time. If your scene is dark you can bump up the ISO, reduce the f-stop value or decrease the shutter speed. Increasing the ISO will increase grain though. You can also change the exposure value, however I have not played with it and if it's anything like EV on a dSLR you can really blow highlights if you push it too far.