Run the AlphaTest example and interactively modify the (Anonymous web server)
Run the AlphaTest example and interactively modify the nine parameters to get a good feel for how to parameterize an Alphaobject for your application (figure 12.2). Figure 12.2 The AlphaTest example allows an Alpha object to be parameterized interactively and plots the resulting Alpha function While testing the AlphaTest example, I ran into an interesting bug in the Alpha NOTE 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 Alphato implement your own Alphafunction. The FileAlphaclass from the CustomAlphaTest examples loads times and alpha values from a text file and linearly interpolates between them. 197
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