It works, png is output. The only problem is that some triangles are missing

Samo Penic

2014-06-13 a61c001cd35ff70a314ef417c4beda9c7e68d3ad

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Original written by Dan Kroll in FORTRAN. Code was then largely adapted and commented by Miha Fosnaric-Fosni. Rewritten into C by Samo Penic-Peni, with help of Miha's extensive explanations.