How can comet3 be modified to have a disappearing tail?

i am not sure how to get the lines which are left behind in comet3 to disappear as the comet moves forward. My goal is to have it repeat a full run a few times and delete the tail as it travels.

i see the section marked 'clean up the tail' but i don't know what to add to that to actually clean it up... and thoughts?

Answer 1

[Paulo Silva]

edit comet3

change all the erasemodes to background, it's in the line functions, example:

'erase','none' -> 'erase','background'

Now change the function name to comet33 on the first line and save it as comet33.m

[Adam Quintero]

Setting the 'erase' mode of the tail settings to 'background' did the trick. thank you.