How to selects a point ID using VEX?

[Zetha]

Hello,

How can you select a point, when you have lots of them?

Using VEX or nodes

 

Thanks!

Edited November 22, 2018 by Zetha

[A-OC]

Group SOP

Or in a wrangle you can type:  

if ( whatever )
	i@group_mygrp = 1;

There's the group expression Sop too.

 

Edited November 23, 2018 by A-OC
The group expression Sop

[acey195]

3 hours ago, A-OC said:

@group_mygrp = whatever;

 

Because of how Houdini deals with ints, you can also do that  (if your "whatever" fits on one line of code)

[A-OC]

9 hours ago, acey195 said:

Because of how Houdini deals with ints, you can also do that  (if your "whatever" fits on one line of code)

Kewl !!

[Zetha]

Thanks,

I have been able to do with the SOP nodes, but I am not able when I try using only VEX.

 

When I type:

if (@ptnum = 56) {
    v@P.y = v@P.y + 2;
}

 

It moves the whole grid of points. How can I move only the point 56?

I cant figure how to select a single point of a grid with the code

 

[toadstorm]

The most obvious problem here is that you're using = instead of == in your conditional statement.

That said, because point wrangles are always running in parallel (all points are processed "simultaneously"), isolating a single point like this is bad form. You should consider using "56" as the group mask for the wrangle instead, or create a point group upstream if you need more points than that.