how to reorder points in python?

[kuaile_yzh]

guys,i meet a afflicting puzzle,anybody can do me a favor?

I just have a more stupid way:exchange all positions of all points,then exchange their attributes.

this method is troublesome and low-cost,i wonder if anyone can have a more convenient way.

thx.

# This code is called when instances of this SOP cook.
geo = hou.pwd().geometry()

# Add code to modify the contents of geo.
tempos=[]
temattrib=[]
for point in geo.points():
	tempos.append(point.position())
	temattrib.append(point.attribValue("Cd"))
pnum=len(tempos)
a=0
for i in range(pnum):
	geo.points()[a].setPosition(tempos[pnum-1])
	geo.points()[a].setAttribValue("Cd",temattrib[pnum-1])
	pnum-=1
	a+=1

sort02.hipnc

Edited May 20, 2009 by kuaile_yzh

[kuaile_yzh]

just change the index of the point but keep its attribute.thx.

[ranxerox]

hello. I am new to houdini and am a little confused. Is this a script sop ? In the docs it says that the script sop does not modify the geometry. I was looking through the docs and the only type of sop I could find to edit the geometry in a similar manner would be a vop sop or a vex sop. Please enlighten me,

thanks

-ranxx

just change the index of the point but keep its attribute.thx.

[edward]

I just have a more stupid way:exchange all positions of all points,then exchange their attributes.

this method is troublesome and low-cost,i wonder if anyone can have a more convenient way.

I was going to say, just use the Sort SOP but you already have that in your .hip file so I am not sure what your question is? By the way, your .hip file wasn't saved with Embedded definitions so your Python SOP code was not included.

[edward]

hello. I am new to houdini and am a little confused. Is this a script sop?

No, kuaile_yzh has created a new SOP HDA that is defined by Python. There are some examples in the docs:

http://www.sidefx.com/docs/houdini10.0/hom.../color_falloff/

http://www.sidefx.com/docs/houdini10.0/hom.../surface_wires/

[kuaile_yzh]

thx,The file is updated.

[edward]

What is your question again?

[kuaile_yzh]

can we change $PT of these point in python?

[edward]

You just effectively did that in python. Points (and attributes) are stored as arrays in Houdini. $PT, or point number is just the index into these arrays. If you want to make your python code more "efficient", then instead of doing two loops, just do one loop and swap half of the elements.