Diffuse transmitter material

Post by **OnoSendai** » Fri May 04, 2007 9:58 pm

A render using the new diffuse transmitter material.
This material is a very simple BSDF that basically scatters incoming light into the opposite hemisphere, with a cosine weighted distrubution.
Although it doesn't really have any exact physical basis, it could be thought of as the limit of many sub-surface scatters inside a thin, highly scattering material. As such it should be useful for simulating such materials as curtains, lampshades etc..
It's meant to be used on single-layer geometry, and it does not have an associated internal medium (it's not an interface material).
It will probably be a good idea to blend this material with a normal diffuse material, so that some backscattered light is visible, not just transmitted light.

EDIT:
added textured test.
3 min render time - this material is a lot faster than using SSS.

manitwo · Post by **manitwo** » Fri May 04, 2007 10:01 pm

wohooo - great work ono!

texturable?

Post by **OnoSendai** » Fri May 04, 2007 10:02 pm

yes, it will be textureable. Test render coming up...

manitwo · Post by **manitwo** » Fri May 04, 2007 10:03 pm

crsrma · Post by **crsrma** » Fri May 04, 2007 10:27 pm

Awesome, this would be great for lighting gels.

SmartDen · Post by **SmartDen** » Fri May 04, 2007 10:39 pm

i'm very exited

mrCarnivore · Post by **mrCarnivore** » Fri May 04, 2007 10:50 pm

Great!

Should be perfect for leaves. Especially for use with the ivy generator since if already produces single plane leaves...

EDIT: How do you have to point the normals? To the light or away from the light? Does it matter at all? If you have to point them towards the light there might be some probles with texturing the backside... There are nor materials that can be textured from btoh sides, are there?

Sebastian · Post by **Sebastian** » Fri May 04, 2007 11:53 pm

Mhh, noice, if it's faster which kind of algorithm does it use ??
Looks very helpful !

SmartDen · Post by **SmartDen** » Sat May 05, 2007 12:17 am

Is the material both-side translucent?

Post by **OnoSendai** » Sat May 05, 2007 12:23 am

The normals don't matter, it acts the same from both sides.

mrCarnivore · Post by **mrCarnivore** » Sat May 05, 2007 12:32 am

Very good! Is it included in 0.8t2 already?

Whaat · Post by **Whaat** » Sat May 05, 2007 2:21 am

awesome ono! I have been waiting for this one....

Post by **OnoSendai** » Sat May 05, 2007 2:35 am

It will be in test 3.

Miso · Post by **Miso** » Sat May 05, 2007 3:12 am

OnoSendai wrote:A render using the new diffuse transmitter material.
This material is a very simple BSDF that basically scatters incoming light into the opposite hemisphere, with a cosine weighted distrubution.

It's great!!
BTW,Only cosine weighted distrubution?
Sharper distrubution enables us to simulate a cinema projector ?

neepneep · Post by **neepneep** » Sat May 05, 2007 8:39 am

nice!

edit: I would really like to see what this looks like in a foggy medium!

Diffuse transmitter material

Diffuse transmitter material

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Re: Diffuse transmitter material

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