Step
- Masking...
You've
just created two independent materials
layered on top of each other and
you're happy. However, you want
the first material to be shown only
at certain places, instead of mixing
them evenly everywhere. This is
where "masking" comes
in.
Select
a mask map (mostly it's black and
white) and click on "Use curve",
as you can see it in a couple of
pictures above. Here comes the beauty:
start playing with the dials and
see what happens.
As
you can see this material has a
light brown and a very dark brown
component. The masking will define
what and where will show up. If
you click on "Mix amount"
instead of "Use curve",
Material 1 and Material 2 will be
mixed evenly, everywhere.
You can add bump to both materials
within the Blend material. You can
create some really awesome textures
this way.
Good
luck and happy trying, I'm sure
you will use this a lot once you
got a hang of it! It might not sound
like such a powerful solution to
you at the first sight, but believe
me, it can make some people scratch
their heads and wonder about how
this, or that texture was made...
:)