22.214.171.124 What a while-loop is and what it is not
A while-loop in POV-Ray is just a control structure which tells POV-Ray to loop a command block while the specified
condition is true (ie. until it gets false).
That is, a while-loop is like this:
The commands between
#end are run over and over as long as the condition
evaluates to true.
A while-loop is not a for-loop nor any kind of loop which has an index variable by itself (which
may be incremented automatically in each loop).
The while-loop does not care what the conditions are between the parentheses (as long as they
evaluate to some value) or what does the block between
#end contain. It will just
execute that block until the condition becomes false.
The while-loop does not do anything else. You can think about it as a kind of "dumb" loop, which does not
do anything automatically (and this is not necessarily a bad thing).