Vertex map access from a tag plugin?

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On 19/07/2004 at 23:44, xxxxxxxx wrote:

User Information:
Cinema 4D Version:   8.503 
Platform:   Windows  ;   Mac OSX  ; 
Language(s) :     C++  ;

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Hi,

is it possible to access and change a vertex map - from the same or another object - at the beginning of each frame from a tag plugin?

I would like to sample lighting data to change the vertext map - any special considerations here?

Thanks for any input!

Kabe

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On 29/07/2004 at 06:41, xxxxxxxx wrote:

Ok, maybe it's my Englich? Or was my question downright stupid? Have I overlooked something obvious?

Thanks for any comment

Kabe

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On 30/07/2004 at 17:15, xxxxxxxx wrote:

Hi Kabe,

if you register your tag plugin as an expression it will be evaluated for each frame. Then you can access the tag list of an object via

  
BaseTag* BaseObject::GetFirstTag(void);  

You can check the tag type via

  
BaseTag::GetType()  

The type ID for vertex map tags is "Tvertexmap".

Then, when you cast the BaseTag object to VariableTag, you can access the actual vertex weights using

  
LONG VariableTag::GetDataCount()  
LONG VariableTag::GetDataSize()  
void* VariableTag::GetDataAddress()  

In a vertex map there should be one Real value for each vertex (same order as vertices).

Hope this helps. Cheers,
Marcus

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On 03/08/2004 at 04:34, xxxxxxxx wrote:

Thanks, it helps indeed!

Kabe

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On 31/10/2004 at 09:44, xxxxxxxx wrote:

how do i have to cast this ?
please post example code
thx

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On 31/10/2004 at 13:28, xxxxxxxx wrote:

ok, i have all the weight data now, but how do i know which point belongs to which vertex ?
http://wwws.htwk-leipzig.de/~ctheil1/code.jpg

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On 31/10/2004 at 20:58, xxxxxxxx wrote:

void *GetDataAddress() should be cast to a Real* for vertex weight maps (Tvertexmap).

The array contains a Real element (weight value) for every vertex in the polygonal/point object - they are in the same order as you would get from object->GetPoint().

Since you are using COFFEE, some this may need conversion from C++ syntax. :)

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On 01/11/2004 at 02:02, xxxxxxxx wrote:

thank you very much!
if they have the same order, it must be possible for me to get the relations. i hope so :)
by the way, i only could play around with this vertexmap stuff, because i found an example somewhere inside the i-net, but i currently don´t know how to make one by myself ... i didn´t found the tag in the list, but c4d works with it like i can see in the example.
so how do i have to create such a tag ? and how can i define the vertex to one special vertextag ?
greetz.