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Messages - Kuky

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1
Maybe, just maybe... it happens because Corona VFB does not use monitor colour profile when showing results?

This is most obvious when you are using a wide gamut monitor. What you see on Corona VFB is more saturated then the final result seen on app which knows windows colour management (Photosohop for example).

2
I had that concern with burn-in and color degradation, but I have 2 phones with oled displays, one of them is very old, maybe 5 years old and has absolutely no burn in anywhere. And it was used pretty often.
Maybe I will have the same luck with an OLED TV ? A new oled tv should be even better/safer compared to a 5 year old phone.

My LG Oled developed burn-in in 6 months, so no...

3
Nice train collection there!

Thank you. I only collect bavarian epoch I (until 1925). Collection is quite big, most probably the biggest bavarian collection in Romania. I did some photo tests for a few loks here https://goo.gl/photos/ivLTBDYWsR3ag6px7



First thing I upgraded the bios. I guess I have to check temps after I put everything in the case.
Now with open case proc is at 76C when rendering and at 86C when denoising.

For the memory I don't understand how to overclock it correctly. The XMP profile is 4000 18-20-20-44 1.35v  but at those settings it does not boot. If I change speeds only from speed memory setting in BIOS (and adjust voltage to boot) at 3600 Mhz the board puts some huge timings 24-24-24-58. If use the Ryzen RAM calculator I obtain much better timings BUT in reality corona rendering is SLOWER.

4
Ok, Jesus has arrived. When I pressed render I began to cry. This system is literally more than 10 times faster than my previous rig.

System is:
PROC: Threadripper 3960x
COOLER: Noctua NH-U14S TR4-SP3
MOBO: Gygabyte TRX40 Aorus Master
RAM: TeamGroup T-Force Night Hawk White RGB 16GB DDR4 4000MHz CL18 dual channel (but 2 pieces, so 32GB quad channel)
HDD: Samsung 980 Pro 1Tb
VIDEO: GTX970 (to be upgraded when this crypto storm fades away)
POWER: EVGA Supernova T2 Titanium 1600w
CASE: Fractal Design Define 7 XL (not arrived yet)


This memory does not seem to want to boot at 3600Mhz unless I raise the voltage to 1.4V. Should I be worried to run the RAM at 1.4V on a daily basis?

5
About this Forum / Re: How to insert images in a reply?
« on: 2021-03-09, 16:11:14 »
Oh, thanks.
But I have to say this is the most tricky way to insert an image in a forum I have ever seen :)))))

6
About this Forum / Re: How to insert images in a reply?
« on: 2021-03-09, 15:42:22 »
Ok, it shows, wtf. But it doesn't show when I preview the message....

And how to insert the image in the body of text?


7
About this Forum / Re: How to insert images in a reply?
« on: 2021-03-09, 15:41:03 »
I attached a 343kb jpg to this message. Does it show?

8
About this Forum / How to insert images in a reply?
« on: 2021-03-09, 13:26:39 »
How to insert images in a reply?
The attachment option does not seem to do anything.

Regards,
Cristian

9
Thank you Juraj and Romullus for your generous help. This is good news. So it's somewhat safe to assume that if I am good with 32GB RAM on 4 cores I will also be good on 24 cores (for the same scenes ofc).

One more bonus question (sorry): has anybody measured how well Corona scales with render times on the Threadripper line. I mean a proper real world test with latest version and the same machine, a long to render scene,  only the processors swapped?

From what I see the actual Corona benchmark is old and obsolete for this new processors. One problem is the length, it is to short to gather relevant data. I checked and from the results there is a huge and confusing range of results:

3960x (24 cores)  Range: 33 sec .... 57 sec      Most frequent results...... 37-38 sec
3970x (32 cores)  Range: 26 sec .... 53 sec      Most frequent results...... 28-29 sec
3990x (64 cores)  Range: 13 sec .... 56 sec      Most frequent results...... 15-18 sec

If I calculate with the most frequent results it seems to scale almost linearly.


10
Thank you for your answer. Yes, indeed 32 Gb is limiting in production but for the moment I am learning so it will do for a while.

The problem with memory management was more regarding if 24 cores will use the same amount of memory as 4 cores when rendering the exact same scene ?

11
Hello,

I have the following situation: I know somebody who wants to cash out his Threadripper 3960X rig and is willing to sell it for about 60% of the new value. But for some strange reason this rig has only 32GB RAM installed.

I am just starting out with Corona and I have 32GB on my current ancient rig (i7-3770k 4 cores from 2012). For the moment being for learning Corona I did not have memory problems with the typical scenes I am working.

Now I know that everybody will tell me to just sell the RAM and buy a 128GB kit but that's 800 EUR which I am willing to spend when (and if) I am starting to make money with this rig.

What I am interested to know is if technically when rendering/IR the exact same scene on a 4 cores/8 threads or a 24cores/48 threads Corona needs more RAM. It's not clear for me how Corona is doing the memory management.

Thank you,
Cristian

12
Hardware / Re: Suggestions on a new ultrawide monitor?
« on: 2021-02-12, 19:34:14 »
.....what should I be looking on a monitor in terms of color?
Of course I'll be using it for CG work.

Define "terms of color" and we can write a book about this question:)

I will oversimplify and consider that this monitor will be used only for CG work. In this case you want only a computer monitor (ie video monitors are excluded, no Flanders or Sony) and you don't care about HDR.

Scenario 1. Your job/life depends on how color accurate your renders are. You work for mr. Nolan on the next Interstellar movie. In this case is easy. You go and buy

- Eizo CG279X or CG319X depending on your wanted size.
- Klein K10-A colorimeter (or similar from CR)
- CR-300 spectroradiometer to calibrate your colorimeter. Alternate solutions are available. Don't bother with i1/2/3 Pro from Xrite they are not reference level. (8nm is too much)
- Calman/Lightillusion license for calibration.
- learn how to calibrate. Keep in mind that there are people who are making a living for doing only that. It's not rocket science but it's not trivial either.

Alternatively you can buy for the same money a nice brand new car. This solution is only for people who ask prices just to be polite.  But you are in the top 0.01% in terms of color accuracy. You are the king of the hill. There is literally nothing better.

Why IMHO the monitors mentioned above are best in their class for your intended use?

- proper 3D LUT implementation (grid volumetric) not the --BS--  Asus, Benq and many others are marketing. I will talk about it later.
- best in class contrast
- best uniformity out of the box. All monitors are handpicked and verified for uniformity - MANUALLY by  a human.
- best uniformity compensation circuits. When using UC Eizo will drop contrast from 1300:1 (native panel) to 1050:1. Benq and other wannabe will drop to 600:1.Have fun working on your brand new monitor with  600:1 contrast.
- best color management software for the intended use. I consider Argyll to be better but it's open source and they don't have the license to write to Eizo 3D LUT slot. What a pity.

Did I mention that the Eizo has built-in colorimeter? I assume that 98% of users will use that instead of the combo I mentioned above. But make no mistake the built-in probe can not match the 15,000 EUR combo.

Second option could be NEC PA271Q and it's 32 inch variant (too lazy to google it). They are using the same panel as Eizo but it has some problems reported by users with calibration. So there is a long discussion there.

Third option? There is no third option. That's it.




Scenario 2.  You want to sleep well and know you delivered a solution which is "good enough" in terms of color accuracy. Then there is this long list of monitors marketed by Benq/Asus (Proart)/Dell/LG/whatever as  "professional". What their marketing and Youtube "reviews" forget to mention:

- there is literally no manual QC involved. The only thing they do is probe the center of the monitor with a lab grade Minolta spectroradiometer and generate spec sheet which always passes QC. You can tweak a 200 EUR panel to pass that test. This test tells you nothing about uniformity. I tested such a monitor and half of it was green and the other half was magenta. You can't correct that.
- no uniformity test is done. Though I have seen lately some pathetic 3x3 grids mentioned.
- 3D LUT is mentioned as a buzzword. In reality in 95% of the cases the so-called 3D LUT is a 1D LUT with a 3x3 matrix (much cheaper). This implementation  takes in consideration that somehow magically your monitor has a linear response from factory. HINT: most of the time it does not, This is not a real 3D LUT solution.

Observation: there are a few exceptions which have proper 3D LUT implementation. You can visit Lightillusion site to find out which are an exception. But this does NOT mean they have proper QC or UC implementation.


- Uniformity compensation (UC) DOES NOT work with custom calibration slots. WTF. See my quick review of Benq SW 320 https://liftgammagain.com/forum/index.php?threads/benq-sw320-very-short-review.10821/#post-108413
- ultra cheap UC implementation destroys contrast when it's available. Actually this is the most important problem.

DO NOT TAKE ME WRONG. In most cases this monitors are much better than zero color managed workflow. You will be in top 2% (my speculation, don't have statistics)



Scenario3. What is color accuracy? In this case any monitor will do.





PS. There is no such thing as ultrawide and color accurate simultaneously. Never happened.


Ok, take everything what I said with a a grain of salt, this is ONLY my opinion.

LATER EDIT: Forgot to mention that in scenario 2 you need to buy an i1 Display Pro colorimeter. Whatever, discussion is already complicated. I mean you need to understand how to use it.

13
Chipping in with my 2 cents: I've recently changed over my main monitor to an LG CX OLED. Such an amazing upgrade over my previous IPS monitor (I'm never going back to IPS). I use DisplayCal with a Spyder 5 for system wide calibration, and am around 1 Delta E.

The difference really is night and day, something was always "off" with the many IPS panels I've used before - constantly second guessing whether what you are seeing is correct/too contrasty/too saturated (even with calibration).

I believe LG are set to release a new G1 OLED this year which supposedly is meant to get brighter than the current CX, but it will cost a fair bit more.

I am curious in how many months it will develop permanent burn-in.

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