Hi!

I want to write an expression for drawing an edge between a point and its nearest neighbor using the Add SOP.

I have a POPnet as input.

Any help would be most welcome!
Thanks!
Gon

Substract position vector of point one from point two. That gives you the line. To find the closest neighbor, there is a proximity attribute node in the popnet.

Edit: Sorry I didn't read your question carefully. I think you figured out what I said already. I'll see if I can come up with something that can group pairs of points.

Haven't tested it fully but how about something like this:


# This code is called when instances of this SOP cook.
geo = hou.pwd().geometry()
points = geo.points()
# Add code to modify the contents of geo.

lst =
for i in points:
p1 = i.number()
p2 = i.attribValue(“nearest”)
pairs = (p1,p2)
curve = geo.createPolygon()
for j in pairs:
point = geo.createPoint()
point.setPosition(points.position())
curve.addVertex(point)

Soothsayer, thanks so much!

I'm not experienced enough — where to paste this code?
It looks like it should work on SOP level, so right after the POPnet outputting $NEAREST on each particle point, right?

Hope the sample file helps to figure this out!
Thanks for the code sweat!
Gon

Try this. I wanted to save the python sop in the file but I always forget how to do it. So you need to copy paste the code into it yourself (red node, right-click>TypeProperties>Code)


# Macha/Soothsayer June, 3, 2010
# drawing lines between pairs of neighbours

# This code is called when instances of this SOP cook.
geo = hou.pwd().geometry()
points = geo.points()
# Add code to modify the contents of geo.

pairs =
for i in points:
p1 = i.number()
p2 = i.attribValue(“nearest”)
pair =
pairs.append(pair)
riap = [ pair, pair ]
if (riap in pairs) != 1:
curve = geo.createPolygon()
for j in pair:
point = geo.createPoint()
point.setPosition(points.position())
curve.addVertex(point)

WOW! I'm running some tests now, screenshot coming
Thanks so much!!
Gon