Victor Wodecki wrote:

> I'm trying to render a scene which has parts made of
> powder-coated metal, and I can't get my texture to
> look right.  Does anyone have a texture for this sort
> of thing?
>
> For those who don't know what I mean, it is a black
> metal finish with small bumps.  All my attempts have
> ended up looking like black sandpaper :-)
>
> Victor.
>
> (If replying via email, remove all digits from my email address first!)

Have you tried a texture map instead of a single proceedural texture.
I think it would be the way to go since you can control the quantity
of roughness to smoothness in a way that's impossible with other texture
proceedures.

Something like this should work:

#declare SmoothBlackTex = whatever
#declare RoughBlackTex   = whatever

object{Part
texture{granite
texture_map{
[ 0 SmoothBlackTex ]
[.5 SmoothBlackTex ]
[.6 RoughBlackTex   ]
[ 1 SmoothBlackTex ]}scale your scale}}

Try different patterens, texture map float values, and scaling.
I think it should work though I didn't try it.

I'll tell you one thing I sure wish I still worked at a place that has
powder coating. That stuff is tough. A good coating takes 3 days
to a week in concentrated methylene chloride to strip properly while
ordinary spray paints take 3 min.

Happy rendering.

K.Tyler

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