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PDSmith — Iray tutorial - Render Large and Reduce.
#iray #render #startrek #tip #tutorial
Published: 2015-11-29 02:37:33 +0000 UTC; Views: 4322; Favourites: 33; Downloads: 93
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So while trolling a few forums and trying to make heads or tails of what people were saying,I swear some people speak English as a first language but type it as a 4th!
This is what I figured they were trying to convey.
So here goes. (but as you can see in the image, it's all self explanatory.)
1)I rendered two images one at 733x1000 and the other at 4263x6000. Bother rendered for 8 minutes.
2) Then I took the larger image and reduced it down to 733x1000 in Photoshop.
So what's the difference?
Look at the lights on the destroyer, just under the saucer section? Quality differences become apparent! Look at the legs, noticed the glitches? The Phaser? The helmet?
So, I guess that means rendering as large as possible isn't what it used to be. At least when it comes to Iray. Render twice or three times larger and reduce the image size for a higher quality image, or so it appears on the surface. I won't get into the technical aspect...I'm just a hobbyist.
...and remember, DAZ didn't create IRAY,
NVIDIA did.
DAZ only made the porting plug in. Much like Reality is the porting plug in to LuxRender.
Studio just does it seamlessly.
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Comments: 17
This is image compression magic. (minor geeky bits)
As you compress the larger image, the fireflies (those little specks on the legs) are filled in with color.
Your image editor will samples the three or four pixels it is converting to one pixel and averages them into a single pixel.
The Firefly is wiped out, in favor of the color of the other pixels.
The dirty edge of the Square lights becomes clean.
You can use this with any rendering software; if you have a render which is coming out grainy, no matter how you change the lights.
It works but there are limits.
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Yes I'm aware how the process works, how ever, I must point out, in a render time of 8 minutes in 3delight of both sizes as specified. You will not get the same effect. The idea and reason for my bring forth this post and showing, was that Iray, Octane, Arion, Indigo to name a few all have this unique ability and given that many are in the recent process of transitioning to the Unbias rendering Engine and that I've been using one for close to six years I thought I'd share what many were trying say.
3Delight and Poser's Firefly does not have this size to time render ability, even with progressive rendering on. It is a unique concept to the Unbias Rendering engine. At this moment I am not aware if Superfly has this ability. No has shown me the results of a test.
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I would like to know how you did the space background?
That's the thing keeping me from rendering space scenes with IRay.
Most likely it's something simple that I haven't figured out!
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I use a simple light set up and back drop. www.daz3d.com/rocks-n-drops-fa… I use Back Drop A with a scene from the Hubble Telescope( push it way back so the ship in the scene doesn't cast a shadow on the back drop. and for light I use Environment Light set to Sun-Sky. I set the date to the 6th month and time to around 7:30pm and Dome Rotation to around 180 or so so the light is some what behind and angled on the ship. Then render a tone of 600x600 image for testing then when ready...go big.
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Generally, not a bad 'guideline' to use. Not just Iray, but even using the 3Delight engine, not a bad idea to render large and reduce.
Iin the days of film photography, you'd shoot the largest film format possible (mine maxed out at 4 inches by 5 inches) knowing it would be reduced. (Of course, other technological barriers reared their ugly head based on how fine the printing machine worked. So an image in Time magazine would not be as sharp as an image in National Geographic (which also included a varnish coat to ge that glossy look and feel.)
BTW - anyone want a 4X5 view camera with 3 lenses? I can make a good deal.
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The draw back comparison here is, 3Delight builds up to the quality, but for some odd reason, when done with Iray, the higher quality is achieved in the reduction. I can't explain it, it just worked. P.F.M. (pure f*%king magic) or push the "I believe button.
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One dumb question before I join the the Iray master race; Is 4.8 backwards compatible with 4.7? With 4.7 I couldn't open any of my 4.6 &4.5 files. Is that a problem with 4.8?
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it all works just fine. I transitioned from 4.7 to 4.8 without a problem.
Now the secret to converting all those textures to Iray. Drop glossyness. if you don't know how to make a texture look right or good in an Iray render, drop the glossyness. and that will help.
as for lights....that's a nightmare with no manual.
Think that might be my next tutorial. how to do lights in Iray for the common hobbiest.
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Ohh YESSS, please make a light tutorial. Iray is such a nice tool, but spot and point lights are nearly not visible when i try to make parts of the scene brighter.
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Interesting. Might have to play with this idea later.
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Good luck, when I tried a 1000x1000 image vs a 9000x9000 image. it may have been just a 10 minutes test but it took 15 minutes total...the extra five minutes for my computer to finally warp the image up and stop. but the quality was better. But there is a draw back! lights made in the scene,; for the larger image may not show the same reflections or even appear as they would in the smaller image. Play around and see what works.
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Anything's gotta be faster than letting it render out for four hours or so each image.
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But your images are so dang nice! But I fully understand. I do my render work in the evening, and let it render at night.
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Heh. Yeah I can crank out two good renders a day with my current schedule (and the lengthy render times) since I actually like to use my laptop for something other than rendering in the afternoons. I usually have it render just before I head to bed and then start another before I head to work.
I'm actually looking at getting a desktop next year that should cut my render times to next to nothing comparatively given the fact it's a dual SLI with 4 GB card each and the 8 core processor is way beyond my current one. That's a ways off yet though, so grinding away on my laptop with the mobile version of the geforce 560 and a 4 year old i7 it is.
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Thank you. Hope the mini tutorial helps. A larger version of the image is on the way.
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