Blurred metallic plastics?

[abdelouahabb]

hi
if you try SLA materials you can get what you need,
and about difference between metal and plastic and leather you can make it when you play with specularity.
hope this help :thumbsup:

[alawrence]

Using the dispersion, even with a low percentage of 5 - 10% will easily reproduce this effect.

You can reduce the accuracy settings and sample to 64 or 32 sample and accuracy to 10% so that the render times do not slow too much.

Otherwise you could use a very fine bumpmap, but this can be problematic as the noise pattern can somethimes be seen repeating, or falls off at oblique angle.

Try the dispersion, you will not be dissappointed.

[Halogen]

hey abdelouahabb,
I haven't used Cinema 4D in a while, and havent really played with SLA (smells like almonds if i remember correctly?) Is this just the presets to c4d, ie danel cheen etc? Excuse my ignorance :P

alawrence, i was playing around with the dispersion aspect in the reflection channel, i assume thats what you were talking about. Here's a render i did with the following material tweaks:
color changed to a grey colour.
reflection : greyish also, not as grey. Brightness 20% (not too reflective), 10% dispersion, 16 min 64 max samples and accuracy at 25%
specular: increased width and height just a little.


I was worried it wasnt working but it seems the dispersion happens on the second pass. I'm still not happy with this result but i think it may be due to the low dispersion. Am i tweaking the right attributes? It does have an environment around to to reflect so maybe it should be more reflective?

Thanks for the help so far, i'll keep tweaking, want the materials to do justice to the modelling!

- Jarrad

[Halogen]

Reflection brightness 40%
dispersion 30%

a little better but i still dont think its looking that fantastic...

[abdelouahabb]

hi
i think it's not the same, sla materials have their own algorithmes, for exemple glass and metalic materials are better with sla than simple materials...(just an idea)
and...they are called Shaders not channels :D

[abdelouahabb]

here is an idea, try to play with specularity color channel, make him a noise, with low scale...just an idea.

[alawrence]

If you are using AR then you will not see the effect until the second pass.

The dispersion may need to be much higher in your instance. Sometimes 10% is plenty but you may want to take it much higher, 25 - 50%.

[Halogen]

nice suggestion abdelouahabb, i'll give that a try.

Thanks for the examples alawrence, shows the difference pretty clearly. Applied a slight specular blur like abdelouahabb suggested, also upped the dispersion value to 50% on the previous HDRI and it looked more accurate. I thought my environment could be poor to show the reflection blur so i changed the dummy HDRI. Although after changing the HDRI, reflections were too blurred. It seems the dispersion value depends on the environment around it. This render is back down to 25% dispersion and its slowly looking better.

Any comments? Should i try tweaking something else?

Cheers for the help so far guys, i love the c4d forum!!! :thumbsup:

- Jarrad

[Halogen]

On further inspection of the camera, there seems to be a semi clearish reflective coating over the grainy reflective material. Can kinda be seen in the photo (reflection of the strap). How can i put an overlay of reflection over the material? Can i just place another material on top? Whats the go with combining materials...

Oh and different angle, too grainy do you think? Disabled specular blur/grain.

[gildattack]

Did you try searching for this material in c4dtextures.com?

[Per-Anders]

Your issue is that you don't have anything much to actually reflect there in the surface and that you have too much diffuse color in your material, your reflection should have a slight amount of fresnel to it too, all but the hardest and shiniest of surfaces do.

[Halogen]

Thanks for the replies,

gildattack, i didn't know about that website but thanks for informing me :thumbsup: some good stuff there. Although i would like to know how to tweak the properties myself, all well and good getting presets but when you wanna make your own and you don't know your way around the material editior, it kinda sucks :P

Thanks for the tips per-anders. You are right there wasn't really much to reflect, and i was thinking this material is mainly a high specular material that is blurred right? but then again when thinking about it, the camera was photographed in an environment so it should have something to reflect. I set up an image plane with jus a jpg photo on to reflect, i added a fresnel to the reflection like you suggested, played around with the color and specular colour/grain. Here's the latest render. Possibly too blurred? Not sure where to take this... Its looking quite decent though imo...

- Jarrad

[vid2k2]

Provided there's a large enough section of the material you want,
I've photographed a portion and developed color, bump and specular maps in PS.

Even though materials can be developed, at times, the real thing does the job best.

HTH

[klueck]

Have you tried to use an environment map on your chrome material?
Best use would be a HDRi that you could blur within C4D.

Other method: use a HDRi on a sky object or a big sphere object that only reflects on the desired surfaces. You also can blur this image.

It's by far easier to adjust the blur level this way. Either with PS or C4D.

Hope this helps.
Cheers, klueck

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