Render this: L.E.D lighting
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Ok, here's my try with Twilight:
I used a very, very darkened HDR as background so the light coming from the LEDs would be the focus of the image. This caused the problem I had already foreseen because I've experienced it many times when taking real photos: If you lower the exposure until you see clearly the shape of the LEDs, the rest of the scene is too dark:
And if you rise the exposure until the rest of the scene looks better, the LEDs themselves become overexposed.
Of course, I could have used a brigther HDR background from the very start (Duh!), but I want to make a point here, so please bear with me.
I saved the render as an HDR and opened it in the free program Picturenaut, which is a very handy tonemapper, HDR creator, HDR<->EXR converter, etc. I used a "photoreceptor" type tonemapping with these settings:
And here's the result:
I could have chosen a higher saturation level but I like how it looks.So, which one do you prefer?
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Your second image looks most realistic to me... LEDs are often overexposed in photos.
By the way, what kind of material did you use? The LEDs themselves look really good. -
Well, in the reference picture I linked to I noticed that LED light comes from:
- A small disc inside the casing, which seems to be the source.
- Total internal reflection.
- Sub-Surface Scattering.
So I used the SSS Rubber Ball template (which by default has IOR = 1.4, which seemed adequate after reading the first posts here), made it completely clear with no color, and rendered it with simple MLT (aka "Easy 09"). Perhaps I could have gotten better results with Bi-directional MLT (Easy 10).
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@ecuadorian said:
Cool reference photo. It would be even cooler to have a LED model like this one (wink, wink).
http://www.otherthings.com/blog/images/led_throwies_small.jpgNice reference photo.
I had a bunch of LED's next to me when I was trying this out earlier. Kept hot-wiring them to a battery until they got hot. -
Closer observation of LEDs reveals that only a part of the plastic is actually lit, so here's an update.
In reality, the lit part starts with a conical shape; I'll try that tomorrow. -
Miguel...the new one looks better, IMO. I think the "cone of shame" added a lot of realism. Care to post the model?
Here's an attempt with a green LED. Not really happy with it. I used a tiny Vray sphere lighting in each of the LED's. I tried an emitter plane, but it looks crappy. Used a soft water SSS material for the bulb casing. Took forever to render the 202 lights!
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OMG!! A Point-Light for any led, it's a rendering nightmare...
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@rev3rse said:
OMG!! A Point-Light for any led, it's a rendering nightmare...
Not if it's just a handful of LED for close ups.
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i think majid's and earthmover's LEDS are most convincing. majid captured that falloff that you get with LEDS...they act like mini spotlights (well the one on my keyring does anyway). So I imagine loading an IES will work well.
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OK, this time I modeled a tiny metalic "cone of shame" (he he he) around an even tinier emitter, to better simulate the light source in a LED.
I'm not sure if I like this image better than the previous one:
Different exposure:
EDIT: Added the model with the cone.
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Here is mine:
Transparent materials - real glass and that's the only correct material here
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this is my try.sketchup + KT and also the result is a photoshop combination.
Also you may try it(unzip and load the KT file, attached)
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First try
(I know I am a little slower at getting this done than some of you. Actually we found a bug where we were processing curved light emitters too slowly, so this helped fix up the software as well)
Al Hart
IRender nXt from Render Plus -
Dang. Majid, you beat me to it. I should've checked this thread before building my LED. Oh well, here it is anyway. Feel free to do what you will with it. It's a bit overboard detail-wise, I even threw in a few air inclusions.
I based it on this picture:
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A quick try (10 minutes) with Vray for SU first version...
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Hi all,
my first post on this forum today!
This is my render of the L.E.D. Lighting:
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Ok mate, I tried to keep and respect your level of details, hope you like it
(distort correction and a bit of bluring , by PS )
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@majid said:
Ok mate, I tried to keep and respect your level of details, hope you like it
(distort correction and a bit of bluring , by PS )Oh, that is really cool. Nice job. What renderer?
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Nice job. I used KT as well, gotta work on my materials. Only thing about KT is that it doesn't do volumetric light beams, so I got the same result as you did in your red LEDs; a bright surface light, but nothing "inside" the LED.
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@escapeartist said:
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Oh, that is really cool. Nice job. What renderer?OK thanx mate , it is KT as usual, nice that u like it
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