Inside Realsoft Shading the interpolation formula is
 (1-p1)*p2+p1*p3
This require 4 operations

Why not use?
(p3-p2)*p1+p2
This require 3 operations

p1 is the %

I do use the same formula as RS in CombadZ, but i don't understand when the second formula does not work?

Jean-Sebastien Perron
www.CombadZ.com

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