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Combine

Combine nodes allow you to made operation between values.
This is basicaly layer mathematic functions.
The math model are taked from the Apple's Shake software.


 Functions Expression
 Add Add 2 values: A + B
 Atop Aa * B + (1-Ba) * A
 Average Find the average value: (A + B) / 2
 Divide Divide 2 values: A / B
 Inside A * Ba
 Maximum Find the maximum value between 2 values: max(A,B)
 Minimum Find the minimum value between 2 values: min(A,B)
 Mix Mix 2 value from a third one: (M * A) + ((1-M) * B)
 Multiply Multiply 2 values: A * B
 Operator A listbox let you switch between combine operator easily
 Outside (1 - Ba) * A
 Over ((1 - Aa) * B ) + A
 Screen 1 - ((1 - A) * (1 - B))
 Subtract Subtract 2 values: A - B
 SubtractAbs Absolute Subtraction of 2 values: abs(A - B)




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