Advanced camera graininess

[formtek]

Hello,

I made a panoramic rendering with the Advanced Camera
But it is a bit granular
What did i do wrong?!?!?!?
Something to do with sampling???????

I include the rendering and the settings i used.

Help!

[Janusz Biela]

Hello!
Nice render!

Almost everything is correct in Kray settings.
To make complete correct just change two things:
- in FG tab add Path Passes 1/50% (I do not see it, you cleaned it?)
- in quality tab Area Light Recursion 1/4 is enough (even lower: 1/3)
- if you use IES lights (I can not recognize - but I see characteristic noise there on the ceiling) then you must use in Quality Tab Luminosity min/max rays 100/0 (minimum) because IES in Kray is calculated by LEM system (it is physical light but calculate differently - also Spherical Lights - same setting control for them)
- Pixel Order: RANDOM always
- last think with big hint for final render: try shoot at least 10.000.000 photons you will get better average information in photon map, more smooth and more accurate.


Of course FG min/max 500/0 is too low for making quite clean render.
But then bigger resolution the FG min/max make less noise....so 500/0 is good for resolution 8000/4000 pix.
For that small what you have 2500 pix (if you did not rescaled down) you need at least FG 1000/0.

Also I suggest to use minimum resolution for panorama: 8000/4000 pix.

Last time I use only QMC: same speed as FG but much better quality especially when I use heavy settings for surfaces which make crazy slow Final Gathering.

[formtek]

Thanks for your quick reaction Janusz!

- Our client asked for a 4096x2048 resolution!
You talked about the FG min/max, what settings do i use for the resolution 4096x2048?

- If i have a deadline and i need to set back the rendering time which settings can i change to do that without a big
quality loss.
In my case i did use IES lights, so that is an important thing, i guess.


Thanks again.







Of course FG min/max 500/0 is too low for making quite clean render.
But then bigger resolution the FG min/max make less noise....so 500/0 is good for resolution 8000/4000 pix.
For that small what you have 2500 pix (if you did not rescaled down) you need at least FG 1000/0.

Also I suggest to use minimum resolution for panorama: 8000/4000 pix.

[Janusz Biela]

So, for IES quality noise you must go to Quality Tab:

For 4000 pix resolution it should be at least FG 500/0 (this what you had) but as you know QMC mode (UnCache) is based on Photon map quality. In other word: shooting photons is interpolated (photon mapping) but calculating GI samples is no interpolated (similar to Maxwell, Octanes, etc). This noise is of course normal, never clean enough (is only level acceptable for user). Why I told you too shoot a lot photons to get the best map.

I think FG 1000/0 should be minimum for this resolution + FSAA G4 Box 1.0.

But If you have time you can use common trick from Octane, Maxwell renders:
- render image with double resolution (8000 pix)
- render with low QMC quality (300/0 or check also 500/0)
- render with low Anti Aliasing FSAA G2 Box 1.0
- render with low reflection blur (Quality Tab Blur Threshold, min Rays/max 100/100)

You should get fast and noisy render. After that you know what to do...PS de noise, PS rescale 50% resolution down, PS sharpening...

This I did in my last render test:
http://www.kraytracing.com/joomla/forum ... &mode=view

Of course somebody can tell: whole procedure takes long but in the end you will get HQ render...which is important for Panorama.