Chaos Corona Forum

Chaos Corona for 3ds Max => [Max] I need help! => Topic started by: INgenia on 2022-08-16, 17:13:26

Title: How to do this finished?
Post by: INgenia on 2022-08-16, 17:13:26

Hi folks,
I have tried to do this metal with a brush patina, but I can't get it 100% off, any advice please?

Title: Re: How to do this finished?
Post by: davetwo on 2022-08-16, 20:59:31

Use a layered material.
Base layer 90% metal wth some anisotrophy, brushed texture in bump and clearcoat
Second layer the same but drop the metalness down and make the colour almost black.
Blend the layers by putting a curvature shader as the mask (only concave white, add some spread and up the directionality).
Theres a screengrab attached, from C4D tho'.

Title: Re: How to do this finished?
Post by: INgenia on 2022-08-17, 10:40:41

Thank you very much for your reply Davetwo,
Interesting your proposal.
I have tried but I am not able to get the dark area like yours at the base of the knob :(
My test comes out very clear. I think the key is in the Curvature ......... but I have already said that I can't get it.

Title: Re: How to do this finished?
Post by: romullus on 2022-08-17, 11:07:17

When you're using curvature as a mask, make sure that base, concave and convex colours are fully black or white. Usually you want to keep base full as black and either convex or concave (sometimes both) as white, that depends on your setup and what you want to achieve. Next you may need to check max distance - depending on your scene units setup and your object size, you may need to increase or decrease its value to get meaningful result. Then it's a matter of playing with ray directionality and colour spread. Launch interactive rendering with isolated object of interest to have best responsiveness, adjust one control at the time and watch how it responds in render. It's a good practice to temporarily replace base and secondary materials with some simple and bold colours to get better visual feedback while adjusting curvature mask.

If you feel that you still have hard time to control curvature, you may want to give a chance to Corona AO map, it's very similar to curvature, but since it was there for much longer, you may be more familiar with it and get good results more intuitively.

Title: Re: How to do this finished?
Post by: INgenia on 2022-08-17, 11:19:15

Very interesting Romullus.
Many thanks, I´m playing with your advice ;) I will upload the result