Create group from array attribute

[cgartashish]

Hi,

I have attached a screenshot, in the following, I want to create a group that will have all the primitves mentioned in the sourceprim attribute, it is an array type attribute and I am unable to combine them all to create a group, please help.

Thanks

[konstantin magnus]

Hi Ashish, try the foreach() function in a primitive wrangle.

foreach(int s; i[]@sourceprim){
    setprimgroup(0, 'sprims', s, 1, 'set');
}

 

[cgartashish]

18 hours ago, konstantin magnus said:

Hi Ashish, try the foreach() function in a primitive wrangle.

foreach(int s; i[]@sourceprim){
    setprimgroup(0, 'sprims', s, 1, 'set');
}

 

Hi,

Thank you for your help, but Its not working. Say, I want to create an array which will have all the values of the array in attribute named sourceprim. So, how can I loop over each point for the sourceprim attribute and append all the different values from the array into one single array variable?

Suppose, I created int my_array[] and then I want this array to have all the values of the sourceprim attribute array. How to do that?? Please help.

[flcc]

This is from a piece of code I get on sidefx forum sometime ago. (can't retrieve the page)
I think it can help. however it's a "post process"

int n = nuniqueval(0, "primitive", "primAtt");
for (int i=0; i<n; i++){
    int uVal = uniqueval(0, "primitive", "primAtt", i);
    append(i[]@uarray, uVal);
}

[konstantin magnus]

Well, do you want to create an array or a group as the title suggests? For a point group just enter pretty much the same code in a point wrangle:

foreach(int s; i[]@sourceprim){
    setpointgroup(0, 'sprims', s, 1, 'set');
}

 

[konstantin magnus]

On 12.7.2019 at 6:22 PM, flcc said:

This is from a piece of code I get on sidefx forum sometime ago. (can't retrieve the page)
I think it can help. however it's a "post process"

int n = nuniqueval(0, "primitive", "primAtt");
for (int i=0; i<n; i++){
    int uVal = uniqueval(0, "primitive", "primAtt", i);
    append(i[]@uarray, uVal);
}

Neat solution, but this does not seem to work for arrays. Here is a python code that flattens arrays from all points to one global array:

node = hou.pwd()
geo = node.geometry()

all = []
for point in geo.points():
    s = point.intListAttribValue('source')
    all.append(s)
    
all = [element for tuple in all for element in tuple]
all = sorted(set(all))

geo.addArrayAttrib(hou.attribType.Global, 'sources', hou.attribData.Int, 1)
geo.setGlobalAttribValue('sources', all)

• Loop through all arrays of the attribute 'source' and append them to a tuple named 'all'.
• The tuple gets converted to a list from which double entries and the order get sorted.
• The list gets assigned to a global aka detail attribute named 'sources'.

Edited July 13, 2019 by konstantin magnus

[konstantin magnus]

Transferring point arrays to a detail wrangle with VEX (slow!):

i[]@all;

for(int i = 0; i < npoints(0); i++){
    int source[] = point(0, 'source', i);
    foreach(int s; source){
        int found[] = find(@all, s);
        if(len(found) == 0){
            append(@all, s);
        }
    }
}

@all = sort(@all);

We also had this discussion a few years ago:

 

Edited July 14, 2019 by konstantin magnus