[PD] Gem axis

[nico]

Le 26 nov. 04, à 09:34, Johannes M Zmoelnig a écrit :

> cyrille henry wrote:
>> hello
>
> hi.
>
> just a quick comment, as i believe, from nico's last email, that it is 
> not clear why "this works and that does not"
>
>> if
>> gemhead
>> |
>> translate
>> |
>> rotate
>> |
>> square
>> does not work,
>
> this is *wrong*, it works!!!
it works but i don't know how to explain in english so i've wrote "does 
not work"
disculp
>
>
>> try :
>> gemhead
>> |
>> rotate
>> |
>> translate
>> |
>> square
>
> this works "too", but both patches are _different_
>
>> transformation order is important.
>
> this is the magic!
>
>
> imagine following:
> 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
and it works well

and what do you think about my polygon and texture question?
>
>
> mfg.cas..r
> IOhannes
>

thank you

nico