[PD] GEM : How to create vertex dynamically? / drawing 3D lines?

[Georges Babouche]

Dear list,

I couldn't find anyone answering my question
on the list...  (sob!) Given the traffic these days, 
I can see various reason for this...

1- Nobody understood what I meant
2- Nobody ever had this problem
3- Noobody ever solved this problem within PD
4- My mail just got drowned in friday's mail rush
5-The question is too hard and nobody wanted
    to waste time answering this.
6-The question is too easy and nobody wanted
    to waste time answering this.
7- other?

still searching ... waiting for a kind GEM/OpenGL guru

to help me find sleep again
many thanks!
vinc (eyes wide shot)


--- Georges Babouche <infopapier at yahoo.com.sg> wrote:
> Date: Fri, 25 Mar 2005 20:43:22 +0800 (CST)
> From: Georges Babouche <infopapier at yahoo.com.sg>
> Subject: GEM : How to create vertex dynamically? /
> drawing 3D lines?
> To: pd-list at iem.at
> 
> Hi,
> 
> I would like to be able to draw lines
> in a 3D space with a Wacom pen tablet,
> and I cannot find any solution for creating
> the vertex.
> 
> I had managed to do that with Jitter
> quite simply with the sketch object
> and commands "moveto" "lineto".
> 
> But it seems that there is no way to 
> dynamically add new vertex and link them to
> get a line (bezier or even a simple).
> 
> I thought I could it with VertexArrays
> but the function handling pointers
> are not (?) accessible in GEM.
> Example :
> glEnableClientState(GLenum array)
>  is instanciated correctly but
> glVertexPointer(GLint size, (...),  const GLvoid
> *pointer);
> is not.
> 
> If this is actually implemented, are there
> any reference guide for how one should type
> the names and command?
> Something like GLdefine for pointers?
> 
> I guess dynamically instanciating new
> [GEMglVertex3f] objects every time I get
> a message from the tablet is not the solution.
> (Well, I hope too ;-)
> 
> The operation seems quite common though...
> I guess that some people must have done
> similar stuff, if the GEMtablet exists...
> Did I miss a sooooo simple function/command?
> Are there any objects/patchs already doin this?
> Any patch repository for GEM could be nice...
> 
> Last: since I would like to be able to deform
> these lines after drawing them, maybe
> my solution is not the best... (and sure isn't
> at the present time)
> 
> Thanks for any helpful advice!
> Vincent
> (still RTFM and STFW for now)
> 
> 
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