Retrieving a detail attribute

[Guest xionmark]

Hi there,

I'm having problems retrieving a detail attribute (float, vector, string, etc.). I can create and retrieve point, primitive and vertex attributes and can create detail attributes (all verified in the spreadsheet) but for some reason I can't seem to be able to retrieve detail attribute offsets and thus the attribute values.

I have tried the different variants of findAttrib() & findAttribute(), for example:

int sd_CG_pos = gdp->findAttrib("sd_CG_pos", 3, GB_ATTRIB_VECTOR);

if(sd_CG_pos >= 0)

UT_Vector3 *CG_pos = (UT_Vector3 *)gdp->attribs().getAttribData(sd_CG_pos);

but I always get a -1 returned from the findAttrib() & findAttribute() calls.

ANother question: for a string detail attribute, what would one use for the "size" argument? I assumed 1 to represent "one string", but also tried the call without the size arg, no difference, they always return a -1 for the offset value (meaning it can't find the attribute):

int obj_tex_fname = gdp->findAttribute("sd_obj_tex_fname", 1, GB_ATTRIB_STRING, GEO_DETAIL_DICT);

-OR-

int obj_tex_fname = gdp->findAttrib("sd_obj_tex_fname", GB_ATTRIB_STRING);

Suggestions? Example?

Thanks!

-Mark

[Jason]

This is a code snip from one of ours which works somehow:

int instance_attr_offset = centroids->pointAttribs().append("break_instance",sizeof(int),GB_ATTRIB_INDEX,"");

GB_Attribute *atr = centroids->pointAttribs().find("break_instance");

[Guest xionmark]

Hi Jason,

Thanks for the example. It got me going down another path but ran into a wall. I can now find the detail attribute and find out what type it is (though I still don't know how to deal with strings yet) but when trying to find the offset to retrieve the data, it still returns a -1. This is true when looking for float, int, vector and string attributes.

myGB_Attr = gdp->attribs().find("sd_obj_tex_fname");
if(myGB_Attr) {
cout << "getType: " << myGB_Attr->getType() << endl;
cout << "getTypeInfo: " << myGB_Attr->getTypeInfo() << endl;
cout << "getName: " << myGB_Attr->getName() << endl;
cout << "getSize: " << myGB_Attr->getSize() << endl;
cout << "getAllocSize: " << myGB_Attr->getAllocSize() << endl;
cout << "getIndex: " << myGB_Attr->getIndex("sd_obj_tex_fname") << endl;
cout << "getIndexSize: " << myGB_Attr->getIndexSize() << endl;
}

example output:

getType: 4

getTypeInfo: 0

getName: sd_obj_tex_fname

getSize: 4

getAllocSize: 4

getIndex: -1

getIndexSize: 1

So how is one supposed to get the index offset from a GB_Attribute object?

Still puzzled

--Mark

[BrianK]

hmm.. I know I saw some back and forth about attributes on the mailing list a while back, so if this has already been answered, please ignore (I should really pay more attention to my e-mails).

If not, I believe you're using the wrong value for size. Size, AFAIK, is the memory footprint, so you should use th result of sizeof, i.e.:

int fooOffset = gdp->findPointAttrib("foo", sizeof(int), GB_ATTRIB_INT);

.. or sizeof(UT_Vector4), etc.

as far as strings go, string attribs are indexed attributes - stored in the gdp and referenced by integer index, so size for the string would, again, be sizeof(int).

If you'd like a code example, I'll post one here. let me know.

::edited to add:: well, it appears this has all been answered in another thread. say la vee. hehe

[rjpieke]

(though I still don't know how to deal with strings yet)

16211[/snapback]

Strings proved to be a real pain-in-the-ass for me. The solution is simple, but I'd have never come up with it without some pointers from the folks here. You can read my thread here:

http://odforce.net/forum/index.php?showtopic=2520