how to get Multi-Parms group menu

[Arthur~Chiu]

single group menu i can use 

cookInputPointGroups(context, myGroup, myDetailGroupPair, alone);

 

but when custom sop node need group menu as Multi-Parms 

 

such as "object merge" parameter "group" 

 

how to do get the select of group

 

 

[edward]

The key to the method is to supply the "parm_index" parameter, which defaults to 0 because the Group parameter is usually the first parameter of a SOP. If you want to run this for some other parameter, you need to give it an appropriate parm_index value.

 

eg. (untested code!)

int n = evalInt("num_groups", 0, context.getTime());
for (int i = 0; i < n; ++i)
{
     PRM_Name multi_group("group#");
     multi_group.harden();
     multi_group.instance(&i, 1);
     int parm_index = getParmList()->getParmIndex(multi_group.getToken());
     // call cookInputPointGroups with parm_index here
}

[Arthur~Chiu]

GU_DetailGroupPair myPointDetailGroupPair;

const GA_PointGroup *mypointGroup; 

 

mypointGroup = gdp->findPointGroup(group_name);

 

cout<<"no cook groupname: "<<mypointGroup->getName()<<endl;

 

if(cookInputPointGroups(context, mypointGroup, myPointDetailGroupPair, 0,true,0,attribindex) < UT_ERROR_ABORT);

{

cout<<"cook groupname: "<<mypointGroup->getName()<<endl;

}

 

the callback is:

no cook groupname: group1

cook groupname: __groupparse1__

 

why?

can someone help me?

[edward]

cookInputPointGroups() returns "mypointGroup" as the group parsed by evaluating the parameter "attribindex". This creates an internal group since the string can by just like "0-9" meaning the first ten points.

[Arthur~Chiu]

GA_FOR_ALL_POINT_ATTRIBUTES(gdp,A)

the a is？

and how to use this function?