Transparent materiality

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Ianev Margarita
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Transparent materiality

Post by Ianev Margarita » Wed Nov 30, 2011 2:36 pm

Hi,
Trying to create a render from sketchup into indigo that is semi- translucent and emits a light. A bit like the image, any ideas on how to create this?
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zha_jsbach_03x.jpg

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zeitmeister
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Re: Transparent materiality

Post by zeitmeister » Wed Nov 30, 2011 8:40 pm

Maybe a diffuse transmitter material could help you here.
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Zom-B
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Re: Transparent materiality

Post by Zom-B » Wed Nov 30, 2011 8:49 pm

I would start with the "Diffuse transmitter" material, that should do the job. Blended together with some Phong material with a exponent of 32 and a little higher IOR, since it gets reduced my blending (maybe 2).

After testing the approach above I would try blending a "Glossy transparent" Material into the phong with very low exponent of 4 and a IOR of 1.8.. Adding SSS to this material maybe needed.

So You End up with a material like attached.

Blending for sure needs to be modified, depending on your scene.
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Test Material.jpg
Test Material.pigm
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CTZn
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Re: Transparent materiality

Post by CTZn » Wed Nov 30, 2011 9:02 pm

Zom-B wrote:So You End up with a material like attached.
NB: it has two blend materials within as described by Zom-B, one will work best with drape-style geometries (single faces) and the other with sealed, volumetric shapes (exclusively save for spare exceptions).
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Zom-B
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Re: Transparent materiality

Post by Zom-B » Wed Nov 30, 2011 9:15 pm

Actually it is a multi-clustered blend where the DT material ist the Master that should be used.
The DT is mixed by 50% with a Phong that itself is mixed to 50% with a Glossy T. Material...
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CTZn
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Re: Transparent materiality

Post by CTZn » Wed Nov 30, 2011 9:28 pm

Good point, I misread the IGM instead of doing the obvious thing :roll: :lol:

So it may not work as expected on open volumes, is this correct ?
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CTZn
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Re: Transparent materiality

Post by CTZn » Wed Nov 30, 2011 9:37 pm

and emits a light
The fabric ?

I thing that's backlighting we see into the image, well there's an army of spots all around.
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Jay-ko
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Re: Transparent materiality

Post by Jay-ko » Fri Jan 23, 2015 5:12 am

okay, I exploring a quite same subject and I hope to have some clues to know what's happens.

I do not understand why a volumetric mesh do not work in all the sides. (see the picture with the openGL preview).
My scene is simply lighted by a HDRI (+7 in the sun disk)


The material assign to the fabrics of the umbrella is a simple DT.
My test-images linked with that post present misterious shadows/black surface "onto" the umbrella with a volumetric meshes.
But I obtain the same result with a single-faced object and I double checker the normal.

Notice that particular zone in the image do not really change color when I play with the tone mapping.
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PrtScr capture_7.jpg
back.jpg
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Jay-ko
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Re: Transparent materiality

Post by Jay-ko » Wed May 25, 2016 12:51 am

Hello, I answer my self for give some clues to an other users with the same kinf of problem:

I do a misunderstanding between, double sided thin materail an diffuse transmitter.

The correct material that I need to use to do that is the Double sided thin material.

be carefull to the exponent when you use an phong, because it multiplied itself with the parameters into the "double sided thin"
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