tamte
f@stress is a prim attribute on the constraints
each point can have multiple constaints attached, so you may want to compute f@stress attribute on the geo yourself based on your metrics, like find all stretch constraints attached to the point and get max stress, or get bend constraints, etc.

_Christopher_
I still do not get where you are getting the name from ?

_Christopher_
Instead of copying, as you did; what would be the path for the DOP Network parameter field and the Objects parameter field; no difference whether manually entered or copied ?

_Christopher_
Although I was wondering is there another way to do this ? 😉

_Christopher_
I want to group all the points which are effected by a stress attribute. Therefore since it's dynamic, I place a wrangler inside of the SOP Solver after the Vellum Post Process node with the following vex code; but I don't see none of the points which are effected based on the float parameter being added to the stress group ?

if(@bend_stress > chf("BendStressAngle")){
@group_bendyStress;
};

i@group_bendStress = f@bend_stress > chf("BendStress");
i@group_bendAngle = f@bend_angle > chf("BendAngle");

_Christopher_
Geometry wrangler DOP as in a wrangler inside a DOP network ?
Do you have any code or resources to which the same could be done as you mentioned using the POP or Geometry Wrangler in DOPS ?

#include <pbd_constraints.h>
int pt = weldTarget(0, @ptnum);

f@stretch_stress = 0;
f@bend_stress = 0;
int constraints[] = pointprims(1, pt);

foreach(int cns; constraints){
    float stress = prim(1, "stress", cns);
    if (inprimgroup(1, "@type=distance" ,cns)) f@stretch_stress = max(f@stretch_stress, stress);
    if (inprimgroup(1, "@type=bend" ,cns)) f@bend_stress = max(f@bend_stress, stress);    
}

tamte

_Christopher_
I want to group all the points which are effected by a stress attribute. Therefore since it's dynamic, I place a wrangler inside of the SOP Solver after the Vellum Post Process node with the following vex code; but I don't see none of the points which are effected based on the float parameter being added to the stress group ?

if(@bend_stress > chf("BendStressAngle")){
@group_bendyStress;
};

that code doesn't do anything since you are not assigning 1 or 0 to that group binding, hence you are not setting the group membership but merely reading the current one

also bend_stress is not measuring the angle directly but you can use the bend_angle attribute also

i@group_bendStress = f@bend_stress > chf("BendStress");
i@group_bendAngle = f@bend_angle > chf("BendAngle");

_Christopher_
Thanks, although the group; bend_stress is not having any points assigned to them, is it because the values in the attribute bend_stress are extremely low to the decimal place so to speak ?

tamte

_Christopher_
Geometry wrangler DOP as in a wrangler inside a DOP network ?
Do you have any code or resources to which the same could be done as you mentioned using the POP or Geometry Wrangler in DOPS ?

so instead of that SOP Solver create POP Wrangle or Geometry Wrangle DOP
- set Inputs/Input 2 to DOP Data
- set DOP Data to: ConstraintGeometry
- check Use This Object's Data
this way whichever function in the wrangle refers to 2nd input, like prim(1, ...) it will refer to ConstraintGeometry of the same vellum object
and this would be the code to get maximum stretch and bend stress from the corresponding constraints attached to the point

#include <pbd_constraints.h>
int pt = weldTarget(0, @ptnum);

f@stretch_stress = 0;
f@bend_stress = 0;
int constraints[] = pointprims(1, pt);

foreach(int cns; constraints){
    float stress = prim(1, "stress", cns);
    if (inprimgroup(1, "@type=distance" ,cns)) f@stretch_stress = max(f@stretch_stress, stress);
    if (inprimgroup(1, "@type=bend" ,cns)) f@bend_stress = max(f@bend_stress, stress);    
}

but again, just use the SOP Solver with Vellum Post-Process as that's future proof since the code for computing the stresses and other values is managed by SideFX