OTOY Forums

hi
i rendered an image two times with the same amount of samples and it looks exactly the same -> also the noise..
is it planed to build in a feature like random seed in fryrender?

then you could merge different rendering to one image to reduce the noise... or in an animation with random "noise" you could use a temporal-filter like neatvideo to reduce the noise.
OR
is it possible to resume a image?

sorry for my english

Im not sure but I think that the noise is the same without MLT
MLT is currently being implemented

Hi,

Sorry for the long delay in replying but i've been a bit sick during the last days.
I can add a seed option, it's indeed handy for making sure noise is different when combining renders, i've put it on my todo list.

Radiance

Never heard of this approach (combining 2 noisy renders), any examples kicking around?

I like the fact that the noise is consistent, this bodes well for animation

Doesn't MLT introduce random samples by default ?

all random numbers used must come from a seed, it does'nt matter which algorithm you're using.

Radiance

Never heard of this approach (combining 2 noisy renders), any examples kicking around?

For my first images rendered with Octane for the competition (v0.7) I had a lot of fireflies, and I used this method : I added the second render on a layer in Photoshop with 50% transparency, and I even did sometimes 3 renders, with the third at 25%. It requires much more rendering time, but works fine and also remove grain everywhere (not only removing fireflies) like a longer render.

After that, with 0.8, the image had very few hotpixels, so I only removed them by hand with the one pixel clone pencil.

hi
thx radiance

for the other people
i think the most unbiased renderer has this feature for the following points (e.g. fryrender,maxwell,.. luxrender?)
- you can render the same image on 2 or more pc and merge the images to a less noisy image -> like renderfarm
- you can render an image and resume it on next day (also possible without random seed?)
- you can use a temporal-filter for animations -> love that but dont work on static noise

i am not a expert but radiance know what i mean