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How Does It Work?
The color SUBTRACT component separately subtracts the red, green, and blue values of the Color_B parameter from the Color_A parameter (Color_A - Color_B).
The percent SUBTRACT component simply subtracts Percent_B from Percent_A but never goes below 0%.
The bump SUBTRACT component is probably the most useful type. It's most powerful function is "cutting out" sections of a bump using another bump. As with the color and percent versions, the
Bump_B value is subtracted from the Bump_A value.
Hints!
Linking only the A parameter to another texture and adjusting the value of the B parameter in the component editor is a good way of making minor adjustments in bump elevations to single texture or a
whole subtree. This is most often useful when matching levels of detail in the creation of a bump map.
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