DjangoBB LoFi version

Full Version: accessing to custom attributes

Root » Houdini Engine for Unity » accessing to custom attributes

chabis

Jan. 9, 2019 18:38:45

i'm looking for accessing to an HDA custom attributes in unity by script.

for example, my HDA contain a primitive attribute “address”(an integer)

is it possible to know in unity the value of this attribute for a specific primitive of my HDA ?

seelan

Jan. 12, 2019 09:27:59

Search for `GetAttributeIntData` in the plugin's source code. It ends up calling HAPI_GetAttributeIntData which is documented here: https://www.sidefx.com/docs/hengine/_h_a_p_i_8h.html#addc0eb499a75e7764fcec857cd3e3814 [www.sidefx.com]

chabis

Jan. 23, 2019 13:09:03

thanks a lot.

chabis

Jan. 23, 2019 15:13:07

ok,
i've try to understand how to use it. i've read a lot, and understood a part, but after all, it's a fail for me: HAPI_GetAttributeIntData seem to be unknown.

below there's my code: (it's just some try to learn) in the first part, i'm trying to access to a parameter (and it's ok).
in the second part, i'm trying to access to an attribute but the last line is wrong (“HAPI_GetAttributeIntData does not exist in the current context”).
i've try a lot of way to write it, looking for examples, all is a fail …
can someone help me ?

HEU_HoudiniAssetRoot myroot = (HEU_HoudiniAssetRoot)curSelected.GetComponent<HEU_HoudiniAssetRoot>();
HEU_HoudiniAsset myhda = myroot._houdiniAsset;
                
// get parameters
HEU_ParameterData paramData = myhda.Parameters.GetParameter("princ_etages");
outvalue = paramData._intValues[0];
Debug.Log(outvalue);

// get attributes
HAPI_AttributeInfo attr_info;
attr_info.owner = HAPI_AttributeOwner.HAPI_ATTROWNER_PRIM;
attr_info.storage = HAPI_StorageType.HAPI_STORAGETYPE_INT;
attr_info.count = 0;
attr_info.tupleSize = 1;
HEU_AttributeData testdata = HAPI_GetAttributeIntData.GetAttributeIntData(null,0,0,"adresse", attr_info,0,1,0,1);

seelan

Jan. 26, 2019 08:48:47

You can't call HAPI_GetAttributeIntData like that. Search in the plugin codebase to see how its being called in other places.

chabis

Jan. 26, 2019 09:12:52

ok, i've search more (and well) and i've finded how to use it.
thanks you seelan !

chabis

Jan. 31, 2019 17:51:26

ok, that's a fail again…
i can't find a part where's used in the plugin codebase.
sorry but.. can you show me a short example of how to get the value of an attribut…?

i Don't understand what i Don't understand …

seelan

Feb. 3, 2019 21:23:08

So you can use a helper to get your int attributes:

HEU_SessionBase session = GetHoudiniSession(true);
HAPI_AttributeInfo addressAttrInfo = new HAPI_AttributeInfo();
int[] addressAttrData = new int[0];
HEU_GeneralUtility.GetAttribute(session, 0, 0, "address", ref addressAttrInfo, ref addressAttrData, session.GetAttributeIntData);

chabis

March 17, 2019 22:15:39

humm , after un long time, i'm trying to understand again…
i've try to use your example, and read again scripts and documentation..

at this time, i need to access to my asset and make a list of nodes and part, because unity answer that the ID i use is invalid.
i had a look of the examples in the plugin (HEU_ScriptMeshInputUVLayoutExample) but it's seem not to be what i need (or i Don't understand..)

so, my question is: how to know the ID of the node and the part ?

i've try with some default values like 0 or 1 , how that could be “invalid” ?
(in my example, “adress” is an attribute for every prim in my OTL.)

i've try to use HAPI_NodeInfo(),HAPI_GeoInfo() and HAPI_PartInfo() but at each time i need a nodeID.

in my mind, what i want to do (to know the value of an attributes of a prim) seem to be “the base” and i'm very confused.

thanks for your help seelan