attributes

[MrScienceOfficer]

Hi guys,

 

Can someone be so kind and tell me whats wrong with this...

    GA_RWAttributeRef weightIdx = gdp->findAttribute(GA_ATTRIB_POINT, "weightIndex");
    GA_RWAttributeRef pointIdx = gdp->findAttribute(GA_ATTRIB_POINT, "pointIndex");
    GA_RWHandleV3 wIdx;
    GA_RWHandleV3 pIdx;

    if (!weightIdx.isValid())
    {
        weightIdx = gdp->addFloatTuple(GA_ATTRIB_POINT, "weightIndex", 3);
        wIdx = GA_RWHandleV3(weightIdx);
    }
        
    if (!pointIdx.isValid())
    {
        pointIdx = gdp->addFloatTuple(GA_ATTRIB_POINT, "pointIndex", 3);
        pIdx = GA_RWHandleV3(pointIdx);
    }

It compiles just fine but when It throws always segmentation fault, but when i do this

    GA_RWHandleV3 wIdx(gdp->findAttribute(GA_ATTRIB_POINT, "weightIndex"));
    GA_RWHandleV3 pIdx(gdp->findAttribute(GA_ATTRIB_POINT, "pointIndex"))

it works just fine, everything's the same except I add the attributes with nodes of course.

 

What's the difference?

 

Also how can I get a Handle for arbitrary sized float Tuple attribute like 9 or something, do I need a Handle to set it?  Can I just use GA_RWAttributeRef?

Edited August 23, 2014 by captain

[edward]

If the weightIndex/pointIndex attributes already exist, then you fail to initialize wIdx and pIdx.

 

You can probably do it less lines of (untested) code like

// addFloatTuple will do nothing if the attribute already exists
GA_RWHandleV3 wIdx(gdp->addFloatTuple(GA_ATTRIB_POINT, "weightIndex", 3));
if (wIdx.isInvalid())
    return; // failed to add *new* weightIndex attribute

To deal with non-specific tuple sizes, use a scalar handle like GA_RWHandleF and specify the tuple component when you call get/set.

[MrScienceOfficer]

Oh okay awesome, that was my first attempt but I must of muffed it up.  

 

Thank you