getAttr for an array of ints

Maya
1

Hi all.

I have a custom with an attribute that is an array of ints.

When I try to get the information using MEL all of the elements come back as 0.

The following mel commands indicate the following:
getattr -type $node.pv returns TdataCompound
getAttr -size $node.pv returns 42 (which is correct)

However, when I do this:

float $pv[] = getAttr $node.pv

The size of $pv is 42, but all of the elements are 0.

I am trying to access individual elements as follows:
$pv[$i] where $i is an index.

Also interesting, the attribute is defined as an array of ints but if I declare $pv as an int array I get an error saying it has to be a float array.

Thanks for the help.
Todd

2

Ok, I just found the following information:

"Reading array attributes. A well-known limitation - you cannot query an array (e.g. '-dt "stringArray"') from MEL."

So, does anyone know the work around? I have a custom node with an attribute that is an array of ints...is there some other way to declare the attribute so that I can get at the information?

Thanks
Todd

3

not true you can querry array attributes via mel just not all types of array atributes. I dont thik thats ever been totaly true.

but you must use the [:]

for example

getAttr "pCubeShape1.pnts[:]";

would querry the all the local tweaks of the polygon (added with vrts would yeald the local cordinate!)

4

Thank you for the help.

Unfortunately, that didn't seem to change my results.

I wonder if my problem is not on the MEL side, but how I am setting the attribute on the API side.

I am using the following code to set the attribute when compute() is called:

MArrayDataBuilder outputBuilder(m\_PartialVerts, theVerts.length());
for(unsigned int i=0; i<theVerts.length(); ++i)
{
	     outputBuilder.addElement(theVerts);
}
MArrayDataHandle outputHandle = data.outputArrayValue(m\_PartialVerts);
outputHandle.set(outputBuilder);
data.setClean(plug);

Does that seem correct to people?

Thanks again.
Todd

5

Ok,

It turns out I was not handling an array attribute properly in my custom node. If anyone else is having difficulty with this I found the correct way to do it in the API section here:

http://www.highend3d.com/boards/showflat.p...;o=0&fpart=

Thanks
Todd