need to know the attribute of neighboring points

[Valent]

Hi, If I have a point(or a primitive) and need to know the value of an attribute on the point(or a primitive) which is on its left, how I can do that?

[fencer]

Google > Houdini point cloud

[Stephen Moroz]

Hey, you can find the point numbers of neighbouring points using the 'nearpoints' vex function. That will return an array of point numbers from the nearest to the furthest. Then from there, you can reference the nearest point number in a point() expression to retrieve the value of the attribute. However I'm not sure what you mean by "left", since left will change depending on the angle of view. Could you clarify what you mean?

[Valent]

Thanks for the reply, Stephen!  It's not the attribute from any closest point that I need, but I'd like to know which of the neighboring points possess certain attribute.

[Stephen Moroz]

59 minutes ago, Valent said:

Thanks for the reply, Stephen!  It's not the attribute from any closest point that I need, but I'd like to know which of the neighboring points possess certain attribute.

In that case, you can still use the nearpoints expression and then iterate through the array with a foreach loop to check if each of them posses that attribute

Edited July 7, 2018 by Stephen Moroz

[Valent]

Thanks, I will try