Creating dust in photoshop

[Stahlberg]

Airbrush a black & white image where you want the dust, then use that in the transparency channel of a Lambert, make it a light grey. Layer it over your wood-shader. Like snow on a mountain there will be more on horizontal surfaces and less on vertical.
Add some grain maybe, if it looks too smooth, and do smudges/fingerprints with a hard-edged brush. Several layers in Photoshop would give the effect of a dusty object that's been handled, then allowed to become dusty again, then perhaps handled again etc.

[darrell]

Thanks Stahlberg, I'm working on the airbrush in photoshop, however there's one small problem, I don't use lightwave or maya so I don't have any Lambert function in my software (electric image 2.9). What is this Lambert channel? and what does it do? how it work? know this I may find a similar fashion in my software.:bounce:

[Stahlberg]

Sorry I didn't know what app you were using. Lambert is a shading model like Blinn and Phong, but with no specular channel. That's what you need, something very matte. Dust could possibly be the mattest surface of all... anyway, if you can go negative on the specular, try that. Or at least zero. The thing is, you want only the dust to be matte, not the surface underneath. In Maya you can simply layer another shader over the first, not sure how you'd do this in EI... maybe use the same transparency map (maybe reversed) to reduce the spec?

[CGTalk Moderation]

This thread has been automatically closed as it remained inactive for 12 months. If you wish to continue the discussion, please create a new thread in the appropriate forum.