If your finger scans have not been collected yet, personal appearances when applying for Schengen visa mandatory.
If your finger scnas were collected within the last 59 months, then you won't have to give new fingerprints for your next visa application(s) and personal appearance is not necessary. However, you have to provide a copy of your visa sticker issued after March 2014. If you are not sure or do not remember whether your fingerprints have been captured for a Schengen visa within the last 59 months, you have to appaear in person.
You will still have to appear in person to give your fingerprings in the case the previously collected fingerprints prove to be of insufficient quality
Personal appearances and fingerprint scan is not necessary for children und the age of 12
The Swiss representation still reserves the right to ask the applicant to appear for a personal interview after checking his application