Can't get light bulb to work

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Doug Armand
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Re: Can't get light bulb to work

Post by Doug Armand » Tue Jul 14, 2009 6:01 am

Did you apply the emitter material to the bulb itself?

The problem seems to be if you want a clear bulb and lit filament.
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Godzilla
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Re: Can't get light bulb to work

Post by Godzilla » Tue Jul 14, 2009 6:02 am

no the bulb is transparent
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Doug Armand
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Re: Can't get light bulb to work

Post by Doug Armand » Tue Jul 14, 2009 7:13 am

Transparent but frosted? not clear glass.

Works well though if you are after a opalescent bulb - personally I like it - may use it myself :wink:

Left pane of glass with your material - right pane with clear glass.

Edited to update image
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Lightbulb.jpg
Lightbulb.jpg (93.54 KiB) Viewed 2187 times
Last edited by Doug Armand on Tue Jul 14, 2009 7:38 am, edited 2 times in total.
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Re: Can't get light bulb to work

Post by Silmä » Tue Jul 14, 2009 7:19 am

turning bidir and metro off gives better result:
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test.jpg
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Doug Armand
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Re: Can't get light bulb to work

Post by Doug Armand » Tue Jul 14, 2009 7:22 am

Thats looking better - I didn't try that :-)
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Re: Can't get light bulb to work

Post by Silmä » Tue Jul 14, 2009 7:27 am

I quess it's the quadruple pass through glass with bidir that's messing things up. I also rendered a very small sample up to like 20 000 spp with those on and it eventually did clear up...

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Doug Armand
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Re: Can't get light bulb to work

Post by Doug Armand » Tue Jul 14, 2009 7:34 am

Looks kinda funky with aperture diffraction on :D

BDir and Metro off
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Lightbulb.jpg
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Polinalkrimizei
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Re: Can't get light bulb to work

Post by Polinalkrimizei » Tue Jul 14, 2009 8:28 am

Merry christmas?! :shock:

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Re: Can't get light bulb to work

Post by Borgleader » Tue Jul 14, 2009 9:06 am

Thanks I'll look into all possible avenues :) Also,merry xmas ;)
Last edited by Borgleader on Thu Jul 16, 2009 2:56 pm, edited 1 time in total.
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Polinalkrimizei
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Re: Can't get light bulb to work

Post by Polinalkrimizei » Tue Jul 14, 2009 9:09 am

Everything you guys say makes a lot of sense but I still don't get it:
Even though the model is not a 100% perfect (modifiers not applied, too big, glass to thick...) this SHOULD work!
I assigned other materials (one of the famous schott db without cauchy b to be precise) and it works actually (just need higher ev adjust and a little higher iso). So it seems to be a material problem that I don't get.
First picture is everything untouched, exept the glass material.
Second picture is with inner faces of the glass removed and ghost glass mat applied.
Attachments
Light Bulb Schott.png
Light Bulb Schott.png (408.73 KiB) Viewed 2158 times
Light bulb ghost glass.png
Light bulb ghost glass.png (370.72 KiB) Viewed 2150 times

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Polinalkrimizei
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Re: Can't get light bulb to work

Post by Polinalkrimizei » Tue Jul 14, 2009 9:17 am

I made two more tests and I think the answer is: Your glass ist just way too thick. If you just remove the inner faces of the bulb, your material works fine :wink:
Or just scale everything to real-world-size.

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Re: Can't get light bulb to work

Post by Borgleader » Tue Jul 14, 2009 9:54 am

I'm geting a "matrix is not invertible" error now >.>
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benn
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Re: Can't get light bulb to work

Post by benn » Tue Jul 14, 2009 11:15 am

I know it's less accurate but it looks better to me if I delete the glass around the filament but leave the bulb - clears up faster.

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Re: Can't get light bulb to work

Post by benn » Tue Jul 14, 2009 11:30 am

Here are my renders:
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lightbulb.jpg
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Re: Can't get light bulb to work

Post by benn » Tue Jul 14, 2009 11:33 am

And without the glass:
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bulbless.png
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