hi all, i'm unclear about xb format in coordinates parameter?, example i enter 0b in, the Node pop error, but use int number(ex. 0b) is normal(uv greater than 1??), is it cant use the float number?
any one can explain it,
thanks,

from the docs: "xb : For example, 0b…. Creates a point at breakpoint (u,v) of the surface number x in the input geometry."

so the are not the uv parameters of the input surface, they are IDs of breakpoint in u/v direction

thats probably what b in xb means, breakpoint

thanks,
if so, xb format like the pn format ?

not exactly

xb will read x-th primitive of the input surface (NURBS/bezier) and position the curve point to u-th breakpoint in u direction and v-th breakpoint in v direction

pn will position the curve point directly to point number n (polygon/curve)

i am not the master in this subject, i just opened help and tried it in a simple scene to see what it does, so it may be something deeper under the surface what i am not aware of