[PD] Gem axis
Johannes M Zmoelnig
zmoelnig at iem.at
Fri Nov 26 09:34:44 CET 2004
cyrille henry wrote:
just a quick comment, as i believe, from nico's last email, that it is
not clear why "this works and that does not"
> does not work,
this is *wrong*, it works!!!
> try :
this works "too", but both patches are _different_
> transformation order is important.
this is the magic!
1) you are standing at the "origin"; you turn 90° to the right; you walk
5 steps forward
2) you are standing at the "origin"; you walk 5 steps forward; you turn
90° to the right
now think: is the result of 1) and 2) the same ? (this is: after the 2
"transformations", are you standing at the same spot and are you looking
in the same direction ?)
this is the way, openGL works
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