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Color identifiers may be declared to make scene files more readable and to parameterize scenes so that changing a single declaration changes many values. An identifier is declared as follows.
- #declare
IDENTIFIER =
COLOR;
|
- #local
IDENTIFIER =
COLOR;
Where IDENTIFIER is the name of the identifier up to 40 characters long and COLOR is any valid specification. Note that there should be a semi-colon at the end of the declaration. This semi-colon is new with POV-Ray version 3.1. If omitted, it generates a warning and some macros may not work properly. See "#declare vs. #local" for information on identifier scope. Here are some examples....
#declare White = rgb <1,1,1>; #declare Cyan = color blue 1.0 green 1.0; #declare Weird = rgb <Foo*2,Bar-1,Bob/3>; #declare LightGray = White*0.8; #declare LightCyan = Cyan red 0.6;
As the LightGray
example shows you do not need any color keywords when creating color expressions based on previously declared colors. The last example shows you may use a color identifier with the keyword style syntax. Make sure that the identifier comes first before any other component keywords.
Like floats and vectors, you may re-define colors throughout a scene but the need to do so is rare.
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