lighting calc checks chunks to see if they really need another pass, and splits up work into batches to avoid memory errors
lighting calc checks chunks to see if they really need another pass, and splits up work into batches to avoid memory errors

codewarrior0/pymclevel,arruda/pymclevel,codewarrior0/pymclevel,arruda/pymclevel,ahh2131/mchisel,mcedit/pymclevel,mcedit/pymclevel,ahh2131/mchisel