How to: Beam of light

pixie · Post by **pixie** » Thu Jan 10, 2008 5:59 am

I've been trying to do a beam of light with a cylinder, one mesh light inside of it, yet it all keeps black... am I doing something wrong?Or does it take lot of time to render?

Cheers

Kram1032 · Post by **Kram1032** » Thu Jan 10, 2008 6:07 am

hum...
is the cylinder open?

pixie · Post by **pixie** » Thu Jan 10, 2008 6:42 am

Kram1032 wrote:hum...
is the cylinder open?

both ends... from what I gathered it seems that I have to add some air with sss

Kram1032 · Post by **Kram1032** » Thu Jan 10, 2008 7:28 am

oh. yeah.
At least, if you want to see the beam^^

Well, when it's black, you don't have any point, where the light can come to the camera... OR very view points and it needs for ever to see the first sample^^
If you don't directly see the lightsource and there's nothing in the scene, but the cylinder and the light (and the cam, obviously^^), you can't get anything but a black image. Where should the light be reflected from?

pixie · Post by **pixie** » Thu Jan 10, 2008 7:37 am

That would be on.... thin air!

Kram1032 · Post by **Kram1032** » Thu Jan 10, 2008 8:02 am

poorly not^^
Indigo's air is thinner than the thinnest possible air: It's with IoR 1, which is vacuum, actually

pixie · Post by **pixie** » Thu Jan 10, 2008 10:25 am

I'm doing some sss air... it's like time has frozeen!

Kram1032 · Post by **Kram1032** » Fri Jan 11, 2008 5:19 am

yeah, it's very slow

Zom-B · Post by **Zom-B** » Fri Jan 11, 2008 5:39 am

lol... I'm just rendering an Epidermis/Dermis Test here for over 70h and its still far from being Noisefree (2x2ghz)...
SSS test isn't fast, but it clears nicely and uniform over time

Kram1032 · Post by **Kram1032** » Fri Jan 11, 2008 5:42 am

And it's highly dependent on your settings:
High scattering'll be slower than low scattering (here, air should be kinda fast, compared to skin)
But high absorption should fasten things up, again ( a + for the skin)

How to: Beam of light

How to: Beam of light

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