Hello,

How would you select edges by their direction ?



Playing with normals doesn't give me an interesting result as every point share the same normal angle.

Guillaume

Hi,

You can write something like this in a Point Wrangle:


N is the direction you want to select edges from, and tolerance allows you to include only edges that are parallel to N (0) or perpendicular to N (1), or anything in between.

i modded the code to this cos i find it easier to understand

coz both dir and n are normalised, their dot product will never ever be greater than 1…so 1 - dot is much easier to digest to me.
i'm just a hobbyist tho so don't take me too seriously.

vusta
i modded the code to this cos i find it easier to understand

vector n = normalize ( chv("v") );
float tolerance = ch("tolerance");

int pts [ ] = neighbours ( 0, @ptnum );
foreach ( int pt; pts )
{
    if ( @ptnum < pt )
    {
        vector p = point ( 0, "P", pt );
        vector dir = normalize ( @P - p );
        if ( 1 -  abs(dot ( dir,n )) <= tolerance )
            setedgegroup ( 0, "edges", @ptnum, pt, 1 );
    }
}
}

coz both dir and n are normalised, their dot product will never ever be greater than 1...so 1 - dot is much easier to digest to me.
i'm just a hobbyist tho so don't take me too seriously.

Hi everyone! found this useful!

there is a missing bracket after " if ( 1 - abs(dot ( dir,n )) <= tolerance )"

thought someone might have trouble running the wrangle.

Thanks!

hello
I'm having a hard time running the wrangle, can someone attache here the hip file, please?
Thank you very much

Matan_Shilo
hello
I'm having a hard time running the wrangle, can someone attache here the hip file, please?
Thank you very much

Same here. I'm getting a rather odd error though the code seems legit.
"Error: Vex error: Preloaded shader is invalid. "

Robot_and_Robot

Matan_Shilo
hello
I'm having a hard time running the wrangle, can someone attache here the hip file, please?
Thank you very much

Same here. I'm getting a rather odd error though the code seems legit.
"Error: Vex error: Preloaded shader is invalid. "

The code I posted compiles.

Hello all
Three years late but better than never.
A student of mine was asking about selecting edges procedurally to polybevel.
After failing to find a solution with the group SOP, I found animatrix's wrangle solution.
At first, I too had the same weird 'shader error', but after some troubleshooting and clearing the extra brace added by vusta,
I managed to get things to work and added some comments in this example file in my journey to understand the code.
It is not fully procedural but it is a way forward instead of manual selection.

Hope it helps others jumping into this in future as I have done this Dec 2023.

p/s you have to click on the top right button in the point wrangle SOP to create the spare parameters after you paste the code.

Michael Ng
Nanyang Polytechnic