try:
miInteger iDataSize;
mi_query(miQ_DATA_PARAM_SIZE, NULL, tTheData, &iDataSize);
mi_info( "*****Data Size: %d", iDataSize);
char* sDataString = new char[iDataSize];
mi_query(miQ_DATA_PARAM, NULL, tTheData, sDataString);
mi_info( "*****Data String: %s", sDataString);
...and don't forget to release the memory once you don't need sDataString
anymore calling:
delete [] sDataString;
...I beleive that should work... try it out and let me know.
To explain: allocate memory with new... since it's a pointer, mi_query
without the & and release the memory at the end.
Mathieu Leclaire
R&D Programmer
Hybride Technologies
-----Original Message-----
From: owner-xsi(at)Softimage.COM [mailto:owner-xsi(at)Softimage.COM]On Behalf
Of Philipp Oeser
Sent: Tuesday, June 13, 2006 8:13 AM
To: xsi(at)Softimage.COM
Subject: Accessing UserDataBlob from Mental Ray
Hi,
second try at getting particle positions over to MentalRay (first was to
read theParticleUserData directly but still cant do it).
So this time: with own UserData. But I am having problems with
retrieving the UserData from within a shader in MR. All I get is the
first character of a string...
so if I put "example" in a blob-string, in MentalRay I only get "e".
I hope this is just some newbie C-thing or something, so if you can help
me out, I'd be really happy :)
So, in XSI i ad d the blob to my selection (in this case just a grid)
and save a string with:
(this is just scripting, not C++, so as I understood I can only save
strings with it...)
............................................................................
...................
set oSel = Selection(0)
set oBlob = oSel.AddProperty( "UserDataBlob", , "data" )
oBlob.Value = "example"
SetValue oBlob&".RenderData", True
SetValue oBlob&".UserDataID", 1111111
............................................................................
...................
And, in MentalRay :
............................................................................
...................
char *sTheData = "grid/data";
miTag tTheData = mi_api_name_lookup(sTheData);
miInteger iDataSize;
mi_query(miQ_DATA_PARAM_SIZE, NULL, tTheData, &iDataSize);
mi_info( "*****Data Size: %d", iDataSize);
char* sDataString;
mi_query(miQ_DATA_PARAM, NULL, tTheData, &sDataString);
mi_info( "*****Data String: %s", sDataString);
............................................................................
...................
The Data Size comes over nicely but the String ist truncated to the
first character. So, as I said I'm pretty unstable in C and dont have a
good understanding of what a blob is, so if you can point me in the
right direction or tell me where i make mistakes, you'll save my day :)
Greetz
Philipp
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