Vex intersect with point against curve

[walter]

Hi guys, does vex intersect() not work with a point and a curve/line?  it is not working unless i polyextrude my curve. 

I am trying to project where the point will be on the curve based on a given normal direction.  

[konstantin magnus]

Hi Walter,

intersect() does work on curves, as well. Just try intersect_all() instead, as it allows setting tolerances.

float tol = chf('tolerance');

vector pos[]; int prim[]; vector uvw[];
int hits = intersect_all(1, v@P, v@N, pos, prim, uvw, tol, tol);

if(hits != 0){
    i@group_hit = 1;
    v@P = pos[0];
}

intersect_all.hiplc

Edited November 26, 2021 by konstantin magnus

[walter]

15 minutes ago, konstantin magnus said:

Hi Walter,

intersect() does work on curves, as well. Just try intersect_all() instead, as it allows setting tolerances.

float tol = chf('tolerance');

vector pos[]; int prim[]; vector uvw[];
int hits = intersect_all(1, v@P, v@N, pos, prim, uvw, tol, tol);

if(hits != 0){
    i@group_hit = 1;
    v@P = pos[0];
}

 

intersect_all.hiplc

i feel so dumb now, i realized my curve was still a surface and i had wireframe mode on all these time. that "ends" node made me realize that ;D  thanks for the help!

Edited November 26, 2021 by walter

[vinyvince]

On 26/11/2021 at 9:00 AM, konstantin magnus said:

Hi Walter,

intersect() does work on curves, as well. Just try intersect_all() instead, as it allows setting tolerances.

float tol = chf('tolerance');

vector pos[]; int prim[]; vector uvw[];
int hits = intersect_all(1, v@P, v@N, pos, prim, uvw, tol, tol);

if(hits != 0){
    i@group_hit = 1;
    v@P = pos[0];
}

intersect_all.hiplc

 

I was hoping this function solve my issue with the ray but it doesn't look like @konstantin magnus

I would like to measure some value , by shooting a ray on the inverse direction of the normal of a 2d shape, like picture bellow. So my idea and expectation before trying was the point will be moved toward the other side and give me a distance. This is what im interested in.

but it's not. If I play with attribute blur to jitter  unique point and convert line, I get move lines, but still not a result I could use.

 

Any idea guys ?