grain in the blender cycles renders.

Noved1

hello! i have been exporting DAZ studio scenes into blender, using the MCJteleblender cycles tool from the forums, and it has made amazing results and all, but i can't find figure out how some of these artists reduce this pesky grain! its as if blender did not finish rendering. is there away i can tell blender to keep the render going? or reduce this grain in any way? how do these pro's i see using cycles do it? -----thank you for your time.

jonas_haag9

I have had the same problem, i googled around and found some tutorials but in the end the same answer i get is increase samples.. But my grain/noise is still there not as much as before but still there. Myself I prefer Daz, its perhaps not as powerful as Blender but its enough for me and its way easier...

Noved1

yep, i just read that in order to remove most of the grain, the samples have to be increased to around 3-5 hundred, or even a few thousand...i just really love having the physics and liquid simulation that is in blender. for water, blood, smoke and such....i would pay cold hard cash for ragdoll and liquid physics in daz studio....maybe sometime in the future.

mCasual

a big factor is how large the sources of light are

if you have an outdoor scene where the light comes from everywhere

using a world-environment background,

then the renders are less grainy, for the same number of samples

if you have in interior scene with no windows and only a few lights, then it takes a whole lot of samples to get rid of the graininess

if i'm not mistaken it's because the rendering process shoots light rays from the light sources, lets them bounce around the room, and eventually the light illuminates your subjects - when the light comes from a sky-dome-image (World-environment) , a lot of light rays have better chances of hitting your subjects

--

the image below used only 240 samples and took 1 minute to render with a GTS450 GPU ( not the fastest card )

the Light Paths setting was a bit too high, normally i set it to "full global illumination" and i bring all the parameters marked "128" down to 32 and i turn caustics off and i change "bounces min" from 3 to 4 ... this gets good results

when i want good renders i set the number of samples to 1000, but for animations i keep it below 240

--
the World Environment ( background ) comes from http://www.hdrlabs.com/sibl/archive.html

with a world environment you dont need other lights in the scene, the light comes from this image which is like pasted onto a sky sphere

which also explains why Aiko has no shadows on the ground, there's no ground she's in a giant sphere-photo

you can also see i tweaked the "vector" settings to bring Aiko on top of the stone

mCasual

for this image, the screen-wall has an emissive material with a strength of 1

the world-environment is gray, and contributes light all over the scene ( there's no walls no ceilings

this too is a 240 samples render