Bathroom, kitchen ceramic with coating

[kroko]

Hello.

Been trying to create a realistic white ceramic. You kow - the one with transparent coating and imperfect reflection angles on surface found on sinks, pots etc. Currently using just glossy material type and the result is... ok. Don't mind the overexposure.



I haven't found much discussion on this topic here. Rhys has a nice render for sink.

The look of surface imperfection I'm trying to get can be seen in this case study, using maxwell. See the top views of the sink.

...to my knowledge, the only render-software capable of producing real looking photos. a poor case study, i'd say hehe

Anyways. As I see it, if Lux would be capable of utilising normal maps I could photoshop one, that would be seamlesly tilable and introduce very small surface normal waviness across the surface.

What would be your suggestions for white ceramic material as seen in our bathrooms and in the example given above. Glossy with some texture of large spots used as bump map? A mix material?

Thanks in advance.

[SATtva]

Ceramic is usually a glossy surface with IOR around 1.4-1.5 and a pretty high exponent. For a more realistic look mix two glossy materials: one with properties outlined above, and a second with low IOR (~1.2) and a very low exponent (10-100). Or, alternatively, a low-exponent glossy with a mirror.

The look of surface imperfection I'm trying to get can be seen in this case study, using maxwell. See the top views of the sink.

I see small procedural bumps. Larger waviness can also be made with larger-scale bumps. I really don't see a problem here for Lux, all your goals are achievable.

[kroko]

I really don't see a problem here for Lux, all your goals are achievable.

Never said I thought there were any

Thanks for suggestions!

I tried a mix of two glossy materials. Nice, however the reflections were a bit to low. Right now trying a setup of mix in a mix (glossy+(glossy+mirror)), the very "lowest" layer being mirror with wery smooth largscale bumpmap applied (you can see the result in ceiling lamp refectance on luxball).
Mat: Mix 0.5;
Slot 1: Mat - Glossy; IOR - 1.5; exp - 45k;
Slot 2: Mat - Mix 0.3; (should bring it down to ~0.2 probably)
Slot 2.1: Mat - Glossy; IOR - 1.2; exp 100;
Slot 2.2: Mat - Mirror; Refl.col. - {1,1,1}; Bumpmap - 0.0100; Bumpmap Texture - procedural blender_stucci (noisesize 0.8, turbulence 1.0), scale 1;

Linear tonemapping - a bit underexposed.

[newsarm2]

For a more realistic look mix two glossy materials: one with properties outlined above, and a second with low IOR (~1.2) and a very low exponent (10-100).

Hi SATtva,
can you explain me the sense of mix 2 glossy materials?
Why it is different than a single glossy material with intermediary parameters?
Is it a faking of layered material?
Thanks,
Marco

[SATtva]

Linear tonemapping - a bit underexposed.

Nice and very convincing.

can you explain me the sense of mix 2 glossy materials?
Why it is different than a single glossy material with intermediary parameters?
Is it a faking of layered material?

Rather to make the base clay layer less lambertian diffuse.

[jeanphi]

can you explain me the sense of mix 2 glossy materials?
Why it is different than a single glossy material with intermediary parameters?
Is it a faking of layered material?

Rather to make the base clay layer less lambertian diffuse.

You could probably do it with the car paint material, it would be slightly faster but is probably harder to understand.

Jeanphi

[binarycortex]

can you explain me the sense of mix 2 glossy materials?
Why it is different than a single glossy material with intermediary parameters?
Is it a faking of layered material?

Rather to make the base clay layer less lambertian diffuse.

You could probably do it with the car paint material, it would be slightly faster but is probably harder to understand.

Jeanphi

Jeanphi, what is the order from inner to outer (123 or 321) for carpaint?

[kroko]

Sharing a render I left over night. Linerar tonemapping.



The result isn't that ceramic-thick-glazed. However that was what I actually needed this time - moulded artificial stone (brands like Montelli, Corian, Hanex) with a glazing which usually is only ~1mm thin (so one could repolish it if damaged, scratched). Satisfied with result, knowing that this is my first (well, actually thanks goes to SATtva ) material in Lux.
The differences are:
- Real ceramic has bigger radiuses for edges, more wavy surface, thicker and imperfect glazing. Ceramic is first moulded, then glazed.
- For "artificial stone" the mould is first inner-glazed, then the mass is poured in. Thiner glazing, geometrically more "correct".

Hopefully real ceramic still to come in future. Maybe need to use homogeneous medium type for SSS, create it like famous "soap material".

[SATtva]

Real ceramic has bigger radiuses for edges, more wavy surface, thicker and imperfect glazing. Ceramic is first moulded, then glazed.

I think this just needs slightly higher values for bump height. Perfectionists could wait for a working SPPM integrator, and model low-exponent glossy base inside a real glass shell of required thickness with bumps or diplacement.

[kroko]

I lowered the bump for mirror material actually as well as applied it as constant scale (very large - 5..7 meters), not U-mapped. Reason - thought that luxball is very small in actual world units (always considering 1 blender unit = 1 meter) to show it in action anyway and a "single wave imperfection" usually "spreads" along ~decimeter in real life on those ceramic surfaces (empirically ). And glossy vs mirror mix in lower layer is only 0.1 now (which decreases the bump effect also), just to get reflectance, but not too much. I know, will have to tweak it for the actual object.

Perfectionists

... you're talking to one

Ataching material if anyone interested:

ceramic_02.lbm

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