Use for material's absorption color

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MetinSeven
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Use for material's absorption color

Post by MetinSeven » Mon Jul 27, 2020 6:30 am

Hi,

What's the common use of a LuxCoreRender material's Absorption functions? It seems that it only changes the surface color, or can you also achieve some SSS effect with it, as opposed to adding a Volume node?

Thanks!
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B.Y.O.B.
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Re: Use for material's absorption color

Post by B.Y.O.B. » Mon Jul 27, 2020 8:53 am

It simulates absorption in the glossy coating, which means it's angle-dependent: the shallower the angle between camera and surface, the stronger the effect. I think I've seen this effect in pottery glaze, but I'm not totally sure. It can also be used for car paint.

It does not compute any SSS.
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MetinSeven
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Re: Use for material's absorption color

Post by MetinSeven » Mon Jul 27, 2020 10:00 am

Thanks for the clarification! So if I understand it correctly absorption on a material level is more like a coating, not sub-surface absorption for a SSS / translucency effect. A volume node is needed for that.
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Dade
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Re: Use for material's absorption color

Post by Dade » Mon Jul 27, 2020 10:04 am

MetinSeven wrote:
Mon Jul 27, 2020 10:00 am
Thanks for the clarification! So if I understand it correctly absorption on a material level is more like a coating, not sub-surface absorption for a SSS / translucency effect. A volume node is needed for that.
Yes, in Lux, materials always describe only the surface, the inside of an object is defined by the volume definition.
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MetinSeven
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Re: Use for material's absorption color

Post by MetinSeven » Mon Jul 27, 2020 10:11 am

Thanks! 👍
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