how to count points on a just one curve?

[pelos]

I can use npoints("../sop") but that count ALL the points, is there a way to just count the points on the first primitive?

[anim]

in VEX you can use primvertexcount()

https://www.sidefx.com/docs/houdini/vex/functions/primvertexcount.html

[pelos]

interesting I am running it on a series of curves/hairs  and I just get   1 as result,  my hairs have 10 points each,  vertex are been consider different as points in this case?

[ThomasPara]

int primpts[] = primpoints(0,@primnum);
i@pointcount = len(primpts);

Will also work.

In a curve each point will have one vertex, so they the count will match.

[anim]

14 minutes ago, pelos said:

interesting I am running it on a series of curves/hairs  and I just get   1 as result,  my hairs have 10 points each,  vertex are been consider different as points in this case?

running it how? 

run over Primitives:

i@n = primvertexcount(0, @primnum);

should return correct number for you per primitive

it's true that it will return number of vertices and not points, and those can differ based on type of the curve and how they are constructed, but for most common polygonal curve primitives they usually match

[pelos]

since I needed in a parameter I did python

node = hou.pwd()
geo = node.geometry()
prim0 = geo.prim(0)
return len(prim0.points())