PointWrangle Runtime

[Alexey Vanzhula]

I use PointWrangleSOP to place my geo on the floor via selected polygon. Code is:

vector center()
{
    float xx[];
    float yy[];
    float zz[];
    for (int i = 0; i < primvertexcount(geoself(), PRIM_NUMBER); i++)
    {
        int pt = vertexpoint( geoself(), vertexindex(geoself(),PRIM_NUMBER, i) );
        vector pt_pos = point(geoself(), "P", pt);
        xx[i] = pt_pos.x;
        yy[i] = pt_pos.y;
        zz[i] = pt_pos.z;
    }
    return set( avg(xx), avg(yy), avg(zz) );
}

vector prim_normal = prim_normal(geoself(), PRIM_NUMBER, 0, 0);
vector to_vector = { 0, -1, 0 };
matrix3 mat = dihedral(prim_normal, to_vector);
vector pos = @P - center();
@P = pos * mat;

Is it good to place user function that get static polygon center at runtime ?

Whether function will be defined on each iteration (through each point) or once ? Or maybe i need to add this center via expression to spare parm ?

Edited June 24, 2014 by Alexey Vanzhula

[magneto]

I think it will be evaluated once every 1024 points, so the expression should be faster. But SESI knows best

[Alexey Vanzhula]

thanx. Where did you find info about "once per 1024 points" ?

[magneto]

SESI support if I didn't interpret it incorrectly.

[Alexey Vanzhula]

while I decided to use AttrbibWrangleSOP with details class to run calculation just once.

Edited June 24, 2014 by Alexey Vanzhula

[magneto]

I think that would be slower for large data sets, but just my guess