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how to for each primitive with vex

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you can do this for example in point wrangle after your Connectivity SOP

int class = prim(0, "class", @primnum);   // get class of point's prim
string grp = sprintf("@class=%s", class);  // ad-hoc group string for all prims with that class value
vector rbb = relbbox(0, grp, @P);  // rel bbox of point's p within bbox of all prims in that group
v@Cd = chramp('color',rbb.y);  // profit



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