Chaos Corona Forum
Chaos Corona for Cinema 4D => [C4D] General Discussion => Topic started by: Tanuki on 2017-03-07, 22:58:06
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Can anyone give me some help in creating a simple ansitropic brushed metal material. It's something I can never seem to get out of corona.
You can see the results im getting in the attachment. the left image is Corona for C4D and the Right is Vray for Rhino. The vray material uses a cheat, and the corona material is my best effort at a proper material. I'm using a material as follows:
Diffuse: Off
Reflection colour: Colour Swatch,
IOR: 30
Roughness: 80
Ansitropic Rotation: Radial Gradient
Ansitropic Amount: Slider full left
Bump: Radial brushed texture at 10%
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I don't know what roughness scale is in C4D, but if it's 0-100, then your 80 may be too much, try to lower it to 40-60. Same goes for anisotropy amount, full anisotropy rarely gives good result. Generally, the rougher your material is, the less anisotropy amount it requires and vice versa.
Don't know how gradient acts in C4D, but in 3ds max some maps has gamma baked into them. Anisotropy requires linear values and no filtering at all. You may want to plug bitmap with radial gradient and see if it makes things to look better. Just make sure to load bitmap as linear. BTW, if you gonna make texture with gradient in photoshop, be aware that by default it doesn't produce linear gradient.
I would unplug bump texture untill anisotropy will be properly sorted out, just to be sure it won't interfere with anything.
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Thanks Romulus, I'l give that a go tonight.
Just to be clear, bump doesn't effect the ansitropic?. My understanding was that it didn't work without some sort of bump enabled.
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Only reflection active:
glossiness -> brushed metal texture
anisotropy -> 0,68
rotation of anisotropy hlights -> c4d gradient 2D-U from black to white
IOR -> 1.5
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Thanks Romulus, I'l give that a go tonight.
Just to be clear, bump doesn't effect the ansitropic?. My understanding was that it didn't work without some sort of bump enabled.
It does, but for effect you want to achieve, bump is impractical. You'd need extremelly high resolution bump map, render to very high resolution output and then downscale image to final res, otherwise renderer will not be able to resolve effect and image filtering will eat everything away. Hence you want to use anisotropy parameter, which is fake substitution to bump driven effect. And as synolog already had show, you'd better replace bump with glossiness - much easier job for renderer and image usually will look better.
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Thanks heaps guys, I've done as suggested, and it's looking pretty good, but I can't get the radial effect on the end caps. Is this a mapping issue? or do I need 2 materials, 1 for the ends caps and 1 for the sides?
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Not necessarry two materials, but two distinct maps, certainly yes.
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Use cylindrical projection under texture tag
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awesome guys, thanks for that. I was doing it well wrong. Looks great now!.