Porting Vops into Vex (primuv)

[sessionbeer]

Hello, I'm trying to get more comfortable with Vex and have hit a hurdle I was hoping someone could help with. For the moment I am trying to convert what is in the Vops network to a point wrangle. I'm struggling with the primuv part of the network (seen below), I believe the prim_attribute in Vex to be the function I need to use, but I don't know where I'm going wrong with it, I've found the documentation a little hard to understand?

 

Any help would be appreciated.

float search_rad = 10.0;
int   max_points = 1;
float uu, vv;
int primid, succ;

int handle = pcopen(0, "P", @P, search_rad, max_points);
vector value = pcfilter(handle, "P");
vector diff = @P - value;
vector sum = @P + diff;
i@prim;
v@uv;
float dist = xyzdist(1, @P, @prim, @uv);
vector hitpoint = {0,0,0};
succ = prim_attribute(1, hitpoint, "P", primid, uu, vv); 
vector blend = lerp(@P, hitpoint, 0.5);

@P = blend;

[mestela]

Primuv works in vex too. Try this instead of your prim_attribute call:

vector lookupuv = set(uu,vv);
hitpoint = primuv (1,"P", primid, lookupuv); 

You don't seem to assign a value to 'primid' anywhere though. Did you mean to use @prim instead?

Edited September 6, 2015 by mestela

[anim]

...

int primid; // you already have this defined, but for completeness

vector primuv;

xyzdist(1, sum, primid, primuv); //as sum is your lookup position according to screenshot and primid and primuv variables will get sampled data

vector hitP = primuv(1, "P", primid, primuv); //then just get "P" from that sample

...

[sessionbeer]

Thanks a lot Mestela and Tomas. I went with you're code Tomas and it worked out great.

 

Cheers!