CHALLENGE: Lamp shade/glass material

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derei
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CHALLENGE: Lamp shade/glass material

Post by derei » Fri Feb 17, 2012 5:12 pm

This challenge came out from this topic: http://twilightrender.com/phpBB3/viewto ... 42&start=0

The challenge is to reproduce the glass material from this photo as accurate as possible (and, if you don't mind, to share the material or the settings with forum users)

EDIT: the model will be rendered using progressive method and preferably Easy09
lamp glass.jpg
lamp glass.jpg (275.97 KiB) Viewed 15557 times
I uploaded here the model:
Component_38.skp
(662.37 KiB) Downloaded 718 times
Last edited by derei on Fri Feb 17, 2012 6:29 pm, edited 1 time in total.
ARTIST AND DESIGNER DEREI.UK

Chris
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Re: CHALLENGE: Lamp shade/glass material

Post by Chris » Fri Feb 17, 2012 5:47 pm

Are you planning to use biased rendering (low+, high+) or unbiased (interior+)? The render method makes a difference because scattering does not currently work correctly with unbiased rendering. (Though I'm guessing with your bulb light emitting surface being complex limits you pretty much to unbiased)

derei
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Re: CHALLENGE: Lamp shade/glass material

Post by derei » Fri Feb 17, 2012 6:27 pm

Chris wrote:Are you planning to use biased rendering (low+, high+) or unbiased (interior+)? The render method makes a difference because scattering does not currently work correctly with unbiased rendering. (Though I'm guessing with your bulb light emitting surface being complex limits you pretty much to unbiased)
Indeed, unbiased and most likely Easy9, because Easy10 is just too much time consuming and the scene is pretty large.
ARTIST AND DESIGNER DEREI.UK

bradleyabbott82
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Re: CHALLENGE: Lamp shade/glass material

Post by bradleyabbott82 » Fri Feb 17, 2012 10:41 pm

Light Example... Same component, changed the Light source to a single sided LEM "filament" - dramatically decreased the render time with same basic effect... This "filament" can be stretched to fit in any housing... -also different materials... if anyone is interested in the process let me know and I'll post Tut w/mats etc.. This took about 10mins of render time in KT w/ 8thread 3Ghz box. about 10 mins of post pro (in reality with a PS procedure only about 1 minute).

bradley
Attachments
testsave2-square.jpg
testsave2-square.jpg (266.65 KiB) Viewed 15525 times
longfilament.png
longfilament.png (19.87 KiB) Viewed 15521 times
testsave2-square.jpg
testsave2-square.jpg (294.26 KiB) Viewed 15522 times

bradleyabbott82
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Re: CHALLENGE: Lamp shade/glass material

Post by bradleyabbott82 » Fri Feb 17, 2012 11:11 pm

Modified the opacity to 1%, shiny to 500.... everything else same.. In KT 10 passes PER MINUTE this is only 10 passes attached. 0 post production. Second image is postpro... 60seconds.

Bradley
Attachments
testsave2-square-1percent-500shiny.jpg
testsave2-square-1percent-500shiny.jpg (294.55 KiB) Viewed 15521 times
testsave2-square-1popatcity.jpg
testsave2-square-1popatcity.jpg (326.92 KiB) Viewed 15509 times
less glow... more linear burn for color
less glow... more linear burn for color
testsave2-square-1popatcity-lessglow.jpg (318.37 KiB) Viewed 15516 times

Fletch
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Re: CHALLENGE: Lamp shade/glass material

Post by Fletch » Fri Feb 17, 2012 11:57 pm

That looks excellent, Bradley, you should upload the component for others to try. The bump on the glass seems stronger than the reference photo. But it succeeds in blurring the single face light emitter. (great idea with the emitting png by the way).

Is this component to scale? It seems a bit bigger than I expected.

bradleyabbott82
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Re: CHALLENGE: Lamp shade/glass material

Post by bradleyabbott82 » Sat Feb 18, 2012 5:14 am

Okay... So.. Here we go... Materials (for both the glass, and LEM attached - see image). Also, breakdown for the post production (I am detail-obsessed so for those not experienced, please forgive my long-winded nature), actually if you're familiar at all with photoshop, the entire post-pro takes about 2 minutes. Anyone with questions please feel free to PM or post :)

I've attached the modified component as well for anyone to play with that wishes to. It is 100% to scale as the original post here. It appears "large" because the model you see it rendered in is actually a Spherical Sky (a render that I made from a model that I recently built). I use these spherical renders each time a build a relatively detailed model so that when I build a component, I can test its individual rendering speed to optimize it before placing it in large groups of components into a model I'm going to render (kind of like a "studio" for testing my components)... Since most of my renders take 24-60 hours, I've found that using these "test backgrounds" to render individual components (especially those with metals / and or LEMs / lights) for their speed in KT with NO other geometry is invaluable in optimizing my render time on large models (where I use these components)... Damn, I'm being long-winded again.

But to that end consider this, the original settings for this component rendered at about 3 passes per minute (not bad), but once I optimized it (changes in LEM, Glass settings, shinyness etc...), I'm getting 8+ passes per minute! Worth the time to save all my "room" models as Spherical renders to test components... Anyway... Probably pointless drivel..

Enjoy.
Attachments
mats-tutorial.JPG
mats-tutorial.JPG (259.25 KiB) Viewed 16089 times
tutorial-lightsave3-rawrender.jpg
tutorial-lightsave3-rawrender.jpg (266.16 KiB) Viewed 15490 times
tutorial-lightsave3-layers.JPG
tutorial-lightsave3-layers.JPG (123.42 KiB) Viewed 15482 times
Last edited by bradleyabbott82 on Sat Feb 18, 2012 5:24 am, edited 3 times in total.

bradleyabbott82
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Re: CHALLENGE: Lamp shade/glass material

Post by bradleyabbott82 » Sat Feb 18, 2012 5:17 am

Component and Photoshop Instructions.

Enjoy.

Bradley
Attachments
lightglass-component-and-PS-Steps.zip
(706.77 KiB) Downloaded 662 times

alvydas
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Re: CHALLENGE: Lamp shade/glass material

Post by alvydas » Sat Feb 18, 2012 8:27 am

:rspkt:

bradleyabbott82
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Re: CHALLENGE: Lamp shade/glass material

Post by bradleyabbott82 » Sat Feb 18, 2012 8:39 am

alvydas,

when you compliment me, it is like Zeus himself came down and touched me with a bolt... :)

:rspkt:

4 months playing with TL, which is my FIRST render engine... (KT for speed lol)... up until Oct/Nov of last year, I've NEVER touched a render-engine in my life...

Bradley

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