url URL date NUMBER NUMBER NUMBERtNUMBER NUMBER NUMBER NUMBER NUMBER this feature excerpted from wolfgang engel s shaderx book from wordware publishing presents a simple shader trick that performs a good per pixel approximation of a non integer power function the technique works for input values between NUMBER and NUMBER and supports large exponents the presented shader does not require any texture look up and is scalable making it possible to spend more instructions in order to decrease the error or to reach greater exponents 