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Hi all been stuck on something for sometime now. have a set of chrome exhausts on a model and ive been trying and failing to get heat tarnished effect on parts of them for some time.
i can get the tarnished bit to look ok-ish, but the rest of the plain untarnished chrome looks shinny grey. When i made the texture i looked at the diffuse color on the chrome materials and noted that they were black so i thought i would make the texture black and put the tarnished color on the top but this gives me the greyish look.
Ive read as many tutorials that i can find and they all use two different materials to get the effect, but as im using iray this is not an option as you still cant do layered materials.
so after messing about with textures and materials im completely stuck, so i thought it was time to ask the people that will know.
So is this possible with IRAY yet or am i going to have to wait, or is there something that im doing wrong with the material( probably is the case as im not the best at materials) or the base color of the texture map?
All and any help would be greatly appreciated.
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Not sure if this dirty/grungy example is what you’re looking for or not. If so then you could start with the A&D chrome preset and add some grunge and/or scratch maps to the reflection amount, reflection glossiness, and diffuse color. You may also want a subtle bump map as well.
TIPs:
1. Concrete maps can work well for creating dirty/grungy metals.
2. You can also use the mix map to blend multiple scratch/grunge maps together for more varied effects.
3. Reflective materials like this will only look as good as the environment/objects they reflect. So make sure you have a nice environment or scene for it to reflect.
In the attached example I used:
Diffuse - mix map blended between concrete and scratches
Reflection map - mix map blends two scratch maps
Reflection glossiness - mix map blends concrete and scratch maps
Bump - amount 0.02 with a scratch map
Environment = Spherical HDR
Jeff Patton
My Website | mental ray materials & blog
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