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1576 Chapter 16: Material Editor, Materials, and Maps
choosingthismethodisthatitworkswellwith
interpolation.
1. Create a map for the brush st reaks. The possible
ways to do this include p ainting a map in a paint
program, or using a Noise map that has been
stretched heavily in one direct ion. The map
should vary between middle-gray and white.
2. Apply this map to the Reflection Color in a
scalesuitableforthebrushing.
3. Set Diffuse Color to white (or the color of the
metal) but set Diffuse Level to 0.0 (or a small
value).
4. MakesureMetalMaterialison.
5. Set Reflect ion Glossiness to 0.75.
6. Set Anisotropy to 0.1 or a similar value. Use
Anisotropy Rotation to align the highlight
properly with the map. If necessary use
Anisotropy Channel to base it on the same
texture space as the map .
Brushed metal
Ca r Pa int M a teri al /S ha der (menta l
ray)
Material Editor > Type b utton > Material/M ap Browser
> Car Paint Material
Material Editor > any material > Click a Map button. >
Material/Map Browser > Car Paint Shader
Note: The Car Paint material and shader appear in the
Browser only if the mental ray renderer is the currently
active renderer.
Car Paint is available as both a mental ray material
and shader; both have identical parameters, and
support the following unique characteristics of
real-world car paint:
• The lowest surface, applied directly to the car
body, is a thin layer of pigment. The properties
of this layer are such that the perceived color
changes depending on the viewing angle as well
as the incident angle of the incoming light.
• Tiny metal flakes are suspended within this
layer. The flakes reflect light and can be seen
glittering on a sunny day, due to individual
flakes reflecting sunlight directly at the
observer.
• Ontopofthisisaclear-coatlayer,whichcanbe
more or less reflective and more or less glossy,
depending on the qua lity of the layer and any
added wax coating. Most notably, this la yer
tends to exhibit a pronounced Fresnel effect,
reflecting more light at glancing ang les.
•IncludesaLambertiandirtlayerforthat
"unwashed" lo ok.