GU_Cookie, how to use it?

[michaelw]

hi there,

I tried to play around with hdk cookie (GU_Cookie) but it messed up. Basically I did these things in my code:

1. merge in input A and input B

2. create primitive and point groups for both inputs

3. call setGroups to setup groups

4. call cookie for the cookie operation

With my understanding, the output should be in those [in/out/overlap] groups that I can check. But when I used two spheres for testing, the result is totally wrong.

Anyone could give me a hint what I did wrong here?

GU_Detail* input_geo0 = (GU_Detail *) inputGeo(0);
GU_Detail* input_geo1 = (GU_Detail *) inputGeo(1);

GA_PrimitiveGroup* pr_a = input_geo0->newPrimitiveGroup("pr_a");
GA_PrimitiveGroup* pr_b = input_geo1->newPrimitiveGroup("pr_b");

GA_PointGroup* pt_a = input_geo0->newPointGroup("pt_a");
GA_PointGroup* pt_b = input_geo1->newPointGroup("pt_b");

for (GA_Iterator it(input_geo0->getPrimitiveRange()); !it.atEnd(); it.advance())
{
GA_Offset offset = it.getOffset();
pr_a->addOffset(offset);
}

for (GA_Iterator it(input_geo1->getPrimitiveRange()); !it.atEnd(); it.advance())
{
GA_Offset offset = it.getOffset();
pr_b->addOffset(offset);
}

for (GA_Iterator it(input_geo0->getPointRange()); !it.atEnd(); it.advance())
{
GA_Offset offset = it.getOffset();
pt_a->addOffset(offset);
}

for (GA_Iterator it(input_geo1->getPointRange()); !it.atEnd(); it.advance())
{
GA_Offset offset = it.getOffset();
pt_b->addOffset(offset);
}





gdp -> merge(* input_geo0);
gdp -> merge(* input_geo1);


GU_Cookie m_cookie;

m_cookie.setGroups(pr_a, pr_b, pt_a, pt_;

GA_PrimitiveGroup* a_in = gdp->newPrimitiveGroup("a_in");
GA_PrimitiveGroup* a_out = gdp->newPrimitiveGroup("a_out");
GA_PrimitiveGroup* a_overlap = gdp->newPrimitiveGroup("a_overlap");

GA_PrimitiveGroup* b_in = gdp->newPrimitiveGroup("b_in");
GA_PrimitiveGroup* b_out = gdp->newPrimitiveGroup("b_out");
GA_PrimitiveGroup* b_overlap = gdp->newPrimitiveGroup("b_overlap");

m_cookie.cookie(*gdp,
0,
*a_in,
*a_out,
*a_overlap,
1,
*b_in,
*b_out,
*b_overlap,
1,
1
	 ); 	
[/CODE]

[michaelw]

one houdini master helped me figured out. In case someone has the same question:

   GU_Detail* input_geo0 = new GU_Detail;
    GU_Detail* input_geo1 = new GU_Detail;

    duplicateSource(0, context,input_geo0);
    duplicateSource(1, context,input_geo1);    


    GA_PrimitiveGroup* pr_a = input_geo0->newPrimitiveGroup("pr_a");
    GA_PrimitiveGroup* pr_b = input_geo1->newPrimitiveGroup("pr_b");


    for (GA_Iterator it(input_geo0->getPrimitiveRange()); !it.atEnd(); it.advance())
    {
        GA_Offset offset = it.getOffset();
        pr_a->addOffset(offset);
    }

    for (GA_Iterator it(input_geo1->getPrimitiveRange()); !it.atEnd(); it.advance())
    {
        GA_Offset offset = it.getOffset();
        pr_b->addOffset(offset);
    }    


    gdp->clearAndDestroy();

    GU_Detail* gdp1 = new GU_Detail;

    gdp1 -> merge(* input_geo0);
    gdp1 -> merge(* input_geo1);    


    GU_Cookie m_cookie;
    m_cookie.setTolerance(0.0001);

    GA_PrimitiveGroup* m_pr_a = gdp1->findPrimitiveGroup("pr_a");
    GA_PrimitiveGroup* m_pr_b = gdp1->findPrimitiveGroup("pr_b");

    m_cookie.setGroups(m_pr_a, m_pr_b, 0, 0);

    m_cookie.cookie(*gdp1,
            0,
            * gdp1->newPrimitiveGroup("a_in"),
            * gdp1->newPrimitiveGroup("a_out"),
            * gdp1->newPrimitiveGroup("a_overlap"),
            1,
            * gdp1->newPrimitiveGroup("b_in"),
            * gdp1->newPrimitiveGroup("b_out"),
            * gdp1->newPrimitiveGroup("b_overlap"),
       	 1,
            1
       	    );
    GU_Detail *new_gdp = m_cookie.getDetail();

    gdp ->merge(*new_gdp);

    gdp1->clearAndDestroy();
    input_geo0->clearAndDestroy();
    input_geo1->clearAndDestroy();   [/CODE]