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While testing the AlphaTest example, I ran into an interesting bug in the Alpha class. If either the increasing alpha ramp or decreasing alpha ramp parameter is set to zero, the other will also be set to zero. You can work around this bug by setting the parameter to 1 millisecond instead of 0 milliseconds.

12.2.1 Using a custom Alpha class

You can, of course, derive your own class from Alpha to implement your own Alpha function. The FileAlpha class from the CustomAlphaTest examples loads times and alpha values from a text file and linearly interpolates between them.


From the file Values.xls from the CustomAlphaTest example