feature "random seed"

Generic forum to discuss Octane Render, post ideas and suggest improvements.
Forum rules
Please add your OS and Hardware Configuration in your signature, it makes it easier for us to help you analyze problems. Example: Win 7 64 | Geforce GTX680 | i7 3770 | 16GB
Post Reply
salvation
Licensed Customer
Posts: 53
Joined: Sat Jan 16, 2010 9:53 am
Location: austria

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
Win7 64 | Geforce 470GTX 1280MB | Q9550 2.83GHz | 8GB Ram | NVidia 306.23 , Cuda 5.0.1
User avatar
Sam
Licensed Customer
Posts: 1012
Joined: Mon Jan 11, 2010 10:06 am
Location: Geneva
Contact:

Im not sure but I think that the noise is the same without MLT
MLT is currently being implemented ;)
http://Kuto.ch - Samuel Zeller - Freelance 3D Generalist and Graphic designer from Switzerland
User avatar
radiance
Posts: 7633
Joined: Wed Oct 21, 2009 2:33 pm

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
Win 7 x64 & ubuntu | 2x GTX480 | Quad 2.66GHz | 8GB
User avatar
samartin
Licensed Customer
Posts: 77
Joined: Sat Jan 16, 2010 11:59 pm
Location: Kingsbury Episcopi, UK
Contact:

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 :)
Win 7 Pro (x64) | Geforce 295GTX | Quad 2.4GHz | 4GB PC-6400
User avatar
Sam
Licensed Customer
Posts: 1012
Joined: Mon Jan 11, 2010 10:06 am
Location: Geneva
Contact:

Doesn't MLT introduce random samples by default ?
http://Kuto.ch - Samuel Zeller - Freelance 3D Generalist and Graphic designer from Switzerland
User avatar
radiance
Posts: 7633
Joined: Wed Oct 21, 2009 2:33 pm

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

Radiance
Win 7 x64 & ubuntu | 2x GTX480 | Quad 2.66GHz | 8GB
User avatar
ROUBAL
Licensed Customer
Posts: 2199
Joined: Mon Jan 25, 2010 5:25 pm
Location: FRANCE
Contact:

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.
French Blender user - CPU : intel Quad QX9650 at 3GHz - 8GB of RAM - Windows 7 Pro 64 bits. Display GPU : GeForce GTX 480 (2 Samsung 2443BW-1920x1600 monitors). External GPUs : two EVGA GTX 580 3GB in a Cubix GPU-Xpander Pro 2. NVidia Driver : 368.22.
salvation
Licensed Customer
Posts: 53
Joined: Sat Jan 16, 2010 9:53 am
Location: austria

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 :)
Win7 64 | Geforce 470GTX 1280MB | Q9550 2.83GHz | 8GB Ram | NVidia 306.23 , Cuda 5.0.1
Post Reply

Return to “General Discussion”