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How to render a two sided transparent material?

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Message 1 of 6
nicola.birtchLPHWK
1149 Views, 5 Replies

How to render a two sided transparent material?

I'm trying to render a material with with an emissive transparent front and noisey back like the prostate in the image below.

4352-prostate-perinologic.png

I used an arnold two sided material with two standard surface shaders.

4354-material-setup.png

Here is an active shade test. It's still not quite like the picture.

How can I:

1. Get more defined glow around the edges/ transparency

2. Add depth to the back side

4355-test-render.png

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Message 2 of 6

I'm really not clear on what results you are trying to achieve.

But to change the contrast of the glowing edge, I'd pipe that Falloff node through some other node to process it. A better way to go would be to use the Arnold Facing Ratio map. If the controls in that map don't give you what you need, then pipe the Facing Ratio through an Arnold Ramp RGB node, and set the Type to Custom. Then you can design whatever curve you want to remap the Facing Ratio colors.

Could you elaborate on what you mean by "add depth to the back side"?

Message 3 of 6
madsd
in reply to: nicola.birtchLPHWK

Maybe you can try implement a facing ratio to control that front hole and you can use the mask for emmision as well.
I did not make the backside, but put an item inside instead.

Added 2020 file.

https://answers.arnoldrenderer.com/storage/attachments/4380-asd.gif

Message 4 of 6

@Aaron Ross

I was trying to match the prostate in the picture above (lighter color object with lesion in it)
I'll try adding the facing ratio. By depth, I guess I meant make the pattern look like it's covering a concave surface. I think it looks almost flat compared to the reference image.

Message 5 of 6
nicola.birtchLPHWK
in reply to: madsd

Thanks! I don't have 2020 sadly only 2019, but the gif helps a lot.

Message 6 of 6

I see, you're saying that the interior looks two-dimensional. That's because you're using Emission and that is overriding whatever lighting is in your scene. I would try it without the Emission. You can turn off shadows for the object using Arnold Properties. That way, light will get in to hit the interior surface but you will still get some shading.

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