[PD] pointcloud in Gem (timbreID) and performance

[Cyrille Henry]

look at the gemvertexbuffer object.
it's 1 year old, so with a bit of luck it should be included in latest pd-extended.
cheers
c


Le 02/09/12 19:06, ronni montoya a écrit :
> In processing theres a library called glgraphics that allows to use
> vertex arrays,this allow to calculate vertices in the gpu and it is
> very fast,  i can draw up to 80 000 vertices in my computer.
>
> Is it possible something like this in pd? Is it possible to access to
> vertex arrays commands from pure opengls from gem?
>
> any idea?
>
>
> R.
>
> 2012/9/2 ronni montoya <ronni.montoya at gmail.com>:
>> In processing theres a library called glgraphics that allows to use
>> vertex arrays,this allow to calculate vertices in the gpu and it is
>> very fast,  i can draw up to 80 000 vertices in my computer.
>>
>> Is it possible something like this in pd? Is it possible to access to
>> vertex arrays commands from pure opengls from gem?
>>
>> any idea?
>>
>>
>> R.
>>
>>
>> 2012/9/2 Max <abonnements at revolwear.com>:
>>> Am 02.09.2012 um 18:23 schrieb Cyrille Henry:
>>>> hello,
>>>>
>>>> the repeat/gemlist trick is very fast. it can be used to render lot's more point in real time.
>>>> (try pmpd example 57 : 2000 points are rendered at 50 fps on my computer with no problem)
>>>
>>> ok, good to know. by the way: the examples in pd-ext go only until 51, but i found the others (not there: drpichon.free.fr/pmpd/ google top result) but http://www.chnry.net/ch/?081-pmpd
>>>
>>>> i suspect that the bottleneck is the list parsing.
>>>
>>> i see.
>>>
>>>> one trick to speed this is to put the list in a table, and use tabread to access the data.
>>>
>>> to you know how tables compare to iemmatrix? the advantage of a matrice would be that i can get a whole row at once.
>>>
>>>
>>>> (i did not have a look a the patch, so i may be wrong).
>>>
>>> i'll try.
>>>
>>> thanks cyrille!
>>>
>>> max
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