Math behind Graph Bias adjustment 2003-11-19 - By Helmar Gerhardt
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Hi,
I'm trying to figure out the mathematics behind Maya's ramp graph input bias
adjustment. The fluidShape node use a lot of them. Maya's description to the
input bias control is as follows:
Opacity Input Bias adjusts the sensitivity of the selected opacity input used.
Input values of 0 and 1 will always map to the start and end of the opacity
curve, although the bias determines where in the curve a value of 0.5 will
index. For example if one used density as an input, and one wishes the material
to become opaque at a density of 0.001, then the density bias can be used to
shift most of the curve into this density range. Instead of cramming several
values at the beginning of the ramp one can use the full range. If the input
bias is 0.0 then a value of 0.5 will map to the exact middle of the opacity
curve.
Anyone know the math to implement this functionality? It would be much
appreciated. Thanks.
Regards,
Helmar
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