[PD] GEM: making a closed cylinder, using display-lists with [GEMgl...]

Max Neupert abonnements at revolwear.com
Tue Apr 5 13:24:06 CEST 2005

Am 05.04.2005 um 13:06 schrieb IOhannes m zmoelnig:
> Max Neupert wrote:
>> hi list,
>> i want to use a closed cylinder. so i made an abstraction 
>> cylinder_closed.pd.
>> but it seems not to be very fast and it can't be used with [repeat n].
>> is there a better way to approach this?
> attached is a version that is both [repeat]able and fast,

hi IOhannes, thanks for your help, i think you forgot to attach the 

> but unfortunately it won't run on your system ;-)

but i guess using the cvs-gem it would run?
> your patch is so slow, because both [cylinder] and [disk] are slow 
> (because they don't use display-lists), so you cannot gain much speed 
> that way.
> chris clepper kept stating that we need a mechanism to allow the user 
> to build their own display-lists to speed things up.
> i always thought that this could be done with the 
> openGL-wrapper-objects, but appearantly 2 crucial objects were missing 
> [GEMglNewList] and [GEMglEndList]; i have added them to the CVS now 
> (and used them already in the patch ;-))
> so what i have done in the patch is create a display-list of the 
> closed cyclinder and call that instead of the objects.
> so my patch is another good example of what the openGL-wrapper is for 
> and how to use it.

i'll try to learn as much as i can about it...

> within the ccylinder-abstraction there is a solitaire subpatch [pd 
> closedcylinder] which does not depend on the openGL-wrapper at all. it 
> is still slow, but you can use it as a normal Gem-object (e.g. with 
> [repeat])


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