How do I make this lampshade?

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Phil Meadows
Posts: 52
Joined: Thu Sep 17, 2009 10:06 am

How do I make this lampshade?

Post by Phil Meadows » Tue May 26, 2020 2:24 pm

I've got a cool pendant lampshade that has a holographic starburst pattern. Is it possible to set materials up in Twilight to use the inter-reflectivity of the glass to cause this effect?
lampshade.png
lampshade.png (541.76 KiB) Viewed 12937 times
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Phil Meadows The Succinct

Fletch
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Re: How do I make this lampshade?

Post by Fletch » Tue May 26, 2020 9:43 pm

Did you build it yet?
It should be possible yes.

Phil Meadows
Posts: 52
Joined: Thu Sep 17, 2009 10:06 am

Re: How do I make this lampshade?

Post by Phil Meadows » Tue May 26, 2020 9:57 pm

I've built a similacrum, once I get home I'll measure it up to get the glass thickness right and redo it.

Will it be a texturing thing you think? Or will I have to make holes and fill them with some other material?
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Phil Meadows The Succinct

Fletch
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Re: How do I make this lampshade?

Post by Fletch » Wed May 27, 2020 8:26 am

Not sure how to make that material as from the image I'm not sure what I'm looking at exactly. :lol:

But I made this scene as food for thought.
Take a close look around and let me know what you think.

Render the scene called "Spots" with exposure set to "2" and use Easy 06. Easy 03 has only 5 reflections set - you can try it and see what that looks like. Experiment.
Attachments
uvsphere01_spotlights.jpg
uvsphere01_spotlights.jpg (199.55 KiB) Viewed 12917 times
uvsphere01.zip
(3.69 MiB) Downloaded 522 times
uvsphere01_emitters-Easy10.jpg
uvsphere01_emitters-Easy10.jpg (314.9 KiB) Viewed 12914 times

Phil Meadows
Posts: 52
Joined: Thu Sep 17, 2009 10:06 am

Re: How do I make this lampshade?

Post by Phil Meadows » Wed May 27, 2020 2:36 pm

Here's what it looks like IRL: It's set up like a mirror—the outside is smoked a little, and the inside is painted with mirrored silver and has holes or voids in the paint. Light shining through it makes the infinite reflections happen.
IMG_1889.jpg
IMG_1889.jpg (1.45 MiB) Viewed 12909 times
IMG_1890.jpg
IMG_1890.jpg (1.68 MiB) Viewed 12909 times
I'm going to try texturing the inside just like IRL and see what happens when I place a point light inside and render at easy 09
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Phil Meadows The Succinct

Phil Meadows
Posts: 52
Joined: Thu Sep 17, 2009 10:06 am

Re: How do I make this lampshade?

Post by Phil Meadows » Wed May 27, 2020 3:13 pm

I don't believe it worked as well as it has.
Pendant starburst_Scene 1.jpg
Pendant starburst_Scene 1.jpg (188.59 KiB) Viewed 12908 times
The outer material is Architectural Glass: Mirrored Glass, with a blue/gray color from SketchUp
The inner material is Brushed Metal: Silver with this .png:
starburst pattern with transparency.png
starburst pattern with transparency.png (4.58 KiB) Viewed 12908 times
The back side of the outer surface is Architectural Glass: Reflective with a blue color.

I'm going to save this and try manipulating the color of the light from top to bottom with a third shell inside the lampshade that graduates from orange at the top to pink and back to orange at the bottom. the IRL lampshade has these subtle color changes and I think that's the best way to do it—color the light before it hits the shade. Would that work? I'll find out I guess.

Any pointers at this point would be appreciated
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Phil Meadows The Succinct

Phil Meadows
Posts: 52
Joined: Thu Sep 17, 2009 10:06 am

Re: How do I make this lampshade?

Post by Phil Meadows » Wed May 27, 2020 9:43 pm

A few iterations of trial and error and I have it to my satisfaction.
Pendant starburst_Scene 2.jpg
Pendant starburst_Scene 2.jpg (145.45 KiB) Viewed 12901 times
Pendant starburst_Scene 4.jpg
Pendant starburst_Scene 4.jpg (146.01 KiB) Viewed 12901 times
Pendant starburst_Scene 5.jpg
Pendant starburst_Scene 5.jpg (151.95 KiB) Viewed 12901 times
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Phil Meadows The Succinct

Phil Meadows
Posts: 52
Joined: Thu Sep 17, 2009 10:06 am

Re: How do I make this lampshade?

Post by Phil Meadows » Wed May 27, 2020 9:48 pm

20_Scene 10.jpg
20_Scene 10.jpg (503.86 KiB) Viewed 12900 times
Here's the context. Looks just about right.
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ntxdave
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Re: How do I make this lampshade?

Post by ntxdave » Thu May 28, 2020 12:10 am

Looks like you worked it all out. :gj: :rspkt:

Fletch
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Re: How do I make this lampshade?

Post by Fletch » Thu May 28, 2020 5:36 pm

:clap: very nice!
Great work - and lovely rendering. :)

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