Hi,
I'm trying to constraint a curve to 90 degree by using attribute wrangle in DETAIL mode like as follow:

//read value from attribute:“edgedist” at index attrIndex
float ReadDistAttr(int arrIndex)
{
int suc;
float retDist= getattrib(0,“point”, “edgedist”,arrIndex,suc);
return retDist;
}

float ReadAngleAttr(int arrIndex)
{
int suc;
float retDist= getattrib(0,“point”, “fixedAng”,arrIndex,suc);
return retDist;
}


vector curPt,nextPt,crossV,targetPt;
for( int i=0;i<@numpt-1;i++)
{
curPt= point(0,“P”,i);
nextPt= point(0,“P”,i+1);
vector vecDiffNextCurNorm=normalize(nextPt-curPt);
float ang=ReadAngleAttr(i+1);

//addpoint(0,crossV+nextPt);
if( ang>0 && ang<=135 )
{
crossV=cross(vecDiffNextCurNorm,{0,1,0})*ReadDistAttr(i+1);
targetPt=crossV+nextPt;
setpointattrib(geoself(), “P”,i+2,targetPt);
//addpoint(0,targetPt);
}
else if( ang>225 && ang<=360 )
{
crossV=-cross(vecDiffNextCurNorm,{0,1,0})*ReadDistAttr(i+1);
targetPt=crossV+nextPt;
setpointattrib(geoself(), “P”,i+2,targetPt);
//addpoint(0,targetPt);
}
}

The problem is that the calculation always refer to the original points and not to the points that modified by setpointattrib function.

Help please

VEX only ever reads from the input geometry and writes to the output geometry, (with the caveat that attributes bound to VEX variables via the @ syntax can give the illusion of reading from the output, but it'll just be reading from a VEX variable, and that only gives access to the “current” element of that attribute). If you need to read from the output geometry, you either need a For Loop SOP block, or a separate Attribute Wrangle. In your case, however, that shouldn't be necessary, because your code only writes to positions two points ahead, so you can just keep track of the P values written using two vector variables, and you already have those variables, e.g.: