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Hi,
The code I gave you should already be setting the alpha value at each vertex. The alpha fades from 1 to 0 from the beginning of the trail to the end. The vertexcolor command has an optional fourth argument which represents the alpha value at that vertex. Be sure to enable viz.BLEND on the object in order for the alpha to work correctly.
Also, the trail should not be a loop. I've attached a screen shot of what the program above should look like when you run it.
There should be no problem with creating an OTF object in a class constructor. How are you initializing the value x?
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