Added strict minimum camera distance
Added strict minimum camera distance

Fixes #7

spirit-code/spirit,GPMueller/spirit,Disselkamp/spirit,spirit-code/spirit,spirit-code/spirit,Disselkamp/spirit,Disselkamp/spirit,GPMueller/spirit,Disselkamp/spirit,spirit-code/spirit,GPMueller/spirit,Disselkamp/spirit,spirit-code/spirit,GPMueller/spirit,GPMueller/spirit,spirit-code/spirit,Disselkamp/spirit,GPMueller/spirit