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Posted by Ceciliabr
at Feb 7, 2018, 12:13:11 AM
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Re: Tin Can Alley
..what all the chat was about, but lovely renderings…
Don't mind the gobbledegook, just look at the pictures 
@okh
First I have to say this: I’m both impressed, surprised and baffled, seeing how a 6240kb model can be shrunk by 99.5% and still contain so much of the original information.
And yes, even if the tiny models do render a lot quicker, glass and optical density and all the other cool settings, will in themselves suck up a lot of rendering time.
So we can assume that the main purpose of reducing the size of a model from 6.240kb to 36kb, is to improve the overall performance of SH3D.
How much will we gain, compared to what we loose?
I really didn’t notice any difference in handling the 36kb Perrier bottle vs handling the 6.240kb Perrier bottle. In fact SH3D still performed
quite smoothly after adding several other high-res models, and as the project finally reached 63.4 MB, SH3D still performed as well as expected
on a tiny MacBook Air. No lagging, no bouncy movements and no graphic hiccups when changing the aspect of the preview window.
The tiny Perrier bottle (36kb) is on the left.
There's really a surprisingly small difference in the visual appearance between the big and the small bottle – at least there's not a 99.5 % difference.
The difference becomes a bit more visible when I zoom in.
I no longer feel any need to point out that the tiny bottle is on the left.
So let's look at the render time:
Using two big Perrier bottles almost doubles the time it takes to render, compared to using two of the tiny bottles.
The visible difference really becomes noticable when I do some close-ups, and the rendering time increases.
A nine-minute-difference when rendering on a three-year-old MacBook Air.
On other computers, the difference will most likely be less than nine minutes.
Of course nine minutes can feel lkke a long time, especially when waiting for something. But think of all the things you can do within nine minutes: You can make a yourself a nice
cup of tea in nine minutes, or a cup of hot chocolate – and you can send a nice sms to your girlfriend, boyfriend, wife, husband, lover, mistress… and you can call your mother.
As for quality vs price, you usually find me in economy class trading potential discomforts for a luxury meal at the destination. Something tells me you have never been pregnant in seat 23B, squeezed between two fat-bottomed American heavyweights for six hours.
Let me try another angle
I sometimes travel to Frankfurt with a small group of business men. They are middle aged men, carrying only their small leather cases, and occasionally an additional plastic bag with gifts or personal paraphernalia picked up at the tax-free store. They prefer to travel light.
They smile, and exchange glances and comments as they are looking at me struggling with lifting my suitcase, until one of them politely offers to help me place it in the overhead locker.
Then, the same evening, when I meet them for dinner at the restaurant, they are amazed when they see me: Wow! they say, and I can see them quickly glancing around the room,
to see if anyone is noticing that they have this elegant lady in their midst. Themselves they have maybe shaved for the occasion, but they’re still wearing the same suit as they wore on the flight.
And on the flight back home, they still wear the same suits, and the same glances and smiles are exchanged, and the same comments are mumbled; why are women always travelling with so much luggage?
(…) there may be a compromise using smoothing where I doubt it is possible to tell the difference. Even at Cec' level. I think.
Even at Cec’ level… I wonder. What about close-ups?
Is the goal to find out how much reduction that can be done to a model before it is noticeable?
In that case, I need to define at what level the term “noticeable†becomes significant when viewing a rendered depiction of a 3D object.
I remember from art-school one time we wanted to paint an old wreck of a VW black for use in a short film. The original colour of the car was light green. So we calculated the size of the surface of the car, and then went to the local paint shop to get advice and to buy exactly the amount of paint we needed to paint the wehicle.
We were on a budget ( economy class), and wanted to spend as little as possible.
The man behind the counter was a skilled professional, and could not resist giving us a lesson about the difference between painting a surface and just applying colour to it.
Being amateurs, he told us, we just might make the car look black, if seen from a distance, but if we wanted close-ups, we had better get a professional to do the job.
Well, we didn’t listen to him – and the result was a complete catastrophe.
In the merciless combination of close-ups and heavy lights, the qualities of an object ( as well as the lack thereof ), become shockingly evident.
I have looked at the files you sent me, and made some renderings that I was not completely happy with.
So in my feverish state of ineffectiveness, I set forth to construct a new wine bottle – one of my favourite wines – the Tignanello from Antinori.
I wanted to make a model that would look good on close-ups. So it ended up weighing 9.843 kb.
Here is a comparison, where I have placed it alongside one of your size-reduced wine bottles, and I have also upgraded the label (only) of one of your beer cans – to match “my levelâ€.
This is a downscaled image.
An unscaled rendering of this image can be seen here: 2352x1440 and a 4K rendering can be seen here: (3840 × 1391- 5.1Mb, png-format.)
(These images are rendered on a MacPro 12 core with 24 threads and 96GB memory.)
Rendering time differences:
My Tignanello-bottle is far from perfect yet. There are still work to be done, especially the cap and the wine inside the bottle needs more work,
and I need to make a new placeholder for the curved label… and I also need to study the mtl-Bible some more, in order to get the right balance between reflection and refraction.
But feel free to download it and use it – improve it – reduce it ... or whatever… or just expel it to the rubbish-bin.
And I suppose you cannot take a glass of my favourite cure... Poor you. Hope for quick recovery. Well, I can find pleasure in drinking a nice cup of hot chocolate, or a glass of hot tea with lots of lime and sugar.
The temperature is rising... outdoors, and my fever has finally lost it’s grip.
So I can’t really blame the fever for chattering away like I’m in a bar. Maybe I'm suffering from some post-flu-syndrom – something that gives me an unstoppable urge to produce harangues of digressive babble...
@bdfd
Nice rendering, and your Heineken-bottle is especially realistic and very well done! Made it yourself? Care to share it?
Cec
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But the effect is very nice though. Now I know.
): 
