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how can i import an stl ASCII format file in processing? and how can i slice it??
Please don't post duplicates. Or triplicates.
Please, no duplicates as it is hard to keep track of the same posts. Consider checking https://forum.processing.org/two/search?Search=STLReader
For STL in Processing, use the toxiclibs STLReader and STLWriter.
Here is their test code for using it. Be sure that you understand the STL file format.
Please, no duplicates! If you want people to answer your question, post it once, and comment on it to update the question or add more detail. Posting tiny bits of the same question several places and ignoring answers makes people frustrated and unlikely to help you in the future.