Importing Point Data

enzym · November 21, 2011

Dear Od,

I am doing something that's a little bit experimental.

Basically I would like to import point data from outside into Houdini. The format is simple Unicode as below:

//===========================================================================

// Script data follows:

//===========================================================================

<Smooth> Count: 3

Loc: (0, 0) Pr: 0 Ti: 1 Ro: 0

</Smooth>

</StrokeHeader>

Wait: 0.000s Loc: (372, 195) Pr: 1 Ti: 1 Ro: -0.75 Rv: NO Iv: NO

Wait: 0.031s Loc: (376, 194) Pr: 1 Ti: 1 Ro: -0.75 Rv: NO Iv: NO

Wait: 0.032s Loc: (383, 192) Pr: 1 Ti: 1 Ro: -0.75 Rv: NO Iv: NO

Wait: 0.022s Loc: (389.5, 190) Pr: 1 Ti: 1 Ro: -0.75 Rv: NO Iv: NO

Wait: 0.028s Loc: (399.25, 186.5) Pr: 1 Ti: 1 Ro: -0.75 Rv: NO Iv: NO

Wait: 0.030s Loc: (411.625, 182.25) Pr: 1 Ti: 1 Ro: -0.75 Rv: NO Iv: NO

Wait: 0.032s Loc: (425.312, 177.625) Pr: 1 Ti: 1 Ro: -0.75 Rv: NO Iv: NO

Wait: 0.032s Loc: (440.656, 172.312) Pr: 1 Ti: 1 Ro: -0.75 Rv: NO Iv: NO

Wait: 0.018s Loc: (452.328, 168.156) Pr: 1 Ti: 1 Ro: -0.75 Rv: NO Iv: NO

Wait: 0.030s Loc: (467.164, 163.078) Pr: 1 Ti: 1 Ro: -0.75 Rv: NO Iv: NO

Wait: 0.032s Loc: (482.082, 157.539) Pr: 1 Ti: 1 Ro: -0.75 Rv: NO Iv: NO

Wait: 0.032s Loc: (496.541, 152.27) Pr: 1 Ti: 1 Ro: -0.75 Rv: NO Iv: NO

Wait: 0.032s Loc: (510.771, 147.135) Pr: 1 Ti: 1 Ro: -0.75 Rv: NO Iv: NO

Wait: 0.032s Loc: (523.885, 142.567) Pr: 1 Ti: 1 Ro: -0.75 Rv: NO Iv: NO

Wait: 0.032s Loc: (535.943, 137.784) Pr: 1 Ti: 1 Ro: -0.75 Rv: NO Iv: NO

Wait: 0.032s Loc: (547.471, 132.392) Pr: 1 Ti: 1 Ro: -0.75 Rv: NO Iv: NO

Wait: 0.032s Loc: (556.736, 128.196) Pr: 1 Ti: 1 Ro: -0.75 Rv: NO Iv: NO

Wait: 0.032s Loc: (563.868, 124.598) Pr: 1 Ti: 1 Ro: -0.75 Rv: NO Iv: NO

Wait: 0.032s Loc: (568.934, 122.299) Pr: 1 Ti: 1 Ro: -0.75 Rv: NO Iv: NO

Wait: 0.064s Loc: (571.467, 120.649) Pr: 1 Ti: 1 Ro: -0.75 Rv: NO Iv: NO

Wait: 0.128s Loc: (572.733, 120.325) Pr: 1 Ti: 1 Ro: -0.75 Rv: NO Iv: NO

Wait: 0.064s Loc: (573.367, 122.662) Pr: 1 Ti: 1 Ro: -0.75 Rv: NO Iv: NO

Wait: 0.032s Loc: (571.683, 126.331) Pr: 1 Ti: 1 Ro: -0.75 Rv: NO Iv: NO

Wait: 0.032s Loc: (569.342, 133.166) Pr: 1 Ti: 1 Ro: -0.75 Rv: NO Iv: NO

Wait: 0.032s Loc: (565.171, 142.583) Pr: 1 Ti: 1 Ro: -0.75 Rv: NO Iv: NO

Wait: 0.032s Loc: (560.085, 154.291) Pr: 1 Ti: 1 Ro: -0.75 Rv: NO Iv: NO

Wait: 0.032s Loc: (554.543, 168.646) Pr: 1 Ti: 1 Ro: -0.75 Rv: NO Iv: NO

Wait: 0.032s Loc: (548.271, 183.823) Pr: 1 Ti: 1 Ro: -0.75 Rv: NO Iv: NO

Wait: 0.032s Loc: (542.136, 200.411) Pr: 1 Ti: 1 Ro: -0.75 Rv: NO Iv: NO

Wait: 0.032s Loc: (536.568, 216.706) Pr: 1 Ti: 1 Ro: -0.75 Rv: NO Iv: NO

Wait: 0.032s Loc: (531.284, 233.853) Pr: 1 Ti: 1 Ro: -0.75 Rv: NO Iv: NO

Wait: 0.031s Loc: (526.142, 252.426) Pr: 1 Ti: 1 Ro: -0.75 Rv: NO Iv: NO

Wait: 0.033s Loc: (521.071, 272.713) Pr: 1 Ti: 1 Ro: -0.75 Rv: NO Iv: NO

Wait: 0.032s Loc: (516.036, 292.357) Pr: 1 Ti: 1 Ro: -0.75 Rv: NO Iv: NO

Wait: 0.032s Loc: (511.518, 311.178) Pr: 1 Ti: 1 Ro: -0.75 Rv: NO Iv: NO

Wait: 0.032s Loc: (507.759, 330.089) Pr: 1 Ti: 1 Ro: -0.75 Rv: NO Iv: NO

Wait: 0.032s Loc: (504.379, 349.045) Pr: 1 Ti: 1 Ro: -0.75 Rv: NO Iv: NO

Wait: 0.032s Loc: (500.69, 368.522) Pr: 1 Ti: 1 Ro: -0.75 Rv: NO Iv: NO

Wait: 0.032s Loc: (497.345, 385.261) Pr: 1 Ti: 1 Ro: -0.75 Rv: NO Iv: NO

Wait: 0.032s Loc: (494.672, 401.631) Pr: 1 Ti: 1 Ro: -0.75 Rv: NO Iv: NO

Wait: 0.032s Loc: (491.336, 416.315) Pr: 1 Ti: 1 Ro: -0.75 Rv: NO Iv: NO

Wait: 0.032s Loc: (488.668, 428.658) Pr: 1 Ti: 1 Ro: -0.75 Rv: NO Iv: NO

Wait: 0.032s Loc: (486.334, 438.329) Pr: 1 Ti: 1 Ro: -0.75 Rv: NO Iv: NO

Wait: 0.032s Loc: (484.667, 445.164) Pr: 1 Ti: 1 Ro: -0.75 Rv: NO Iv: NO

Wait: 0.032s Loc: (483.833, 449.582) Pr: 1 Ti: 1 Ro: -0.75 Rv: NO Iv: NO

Wait: 0.080s Loc: (482.917, 452.291) Pr: 1 Ti: 1 Ro: -0.75 Rv: NO Iv: NO

Wait: 0.031s Loc: (478, 456) Pr: 1 Ti: 1 Ro: -0.75 Rv: NO Iv: NO

</StrokeEvent>

<Smooth> Count: 3

Loc: (483.866, 448.055) Pr: 1 Ti: 1 Ro: -0.75

Loc: (481.596, 451.561) Pr: 1 Ti: 1 Ro: -0.75

Loc: (479.327, 455.068) Pr: 1 Ti: 1 Ro: -0.75

</Smooth>

</StrokeHeader>

Wait: 0.000s Loc: (463.5, 292) Pr: 1 Ti: 1 Ro: -0.75 Rv: NO Iv: NO

Wait: 0.032s Loc: (480.25, 288.5) Pr: 1 Ti: 1 Ro: -0.75 Rv: NO Iv: NO

Wait: 0.032s Loc: (501.625, 284.75) Pr: 1 Ti: 1 Ro: -0.75 Rv: NO Iv: NO

Wait: 0.032s Loc: (525.312, 280.375) Pr: 1 Ti: 1 Ro: -0.75 Rv: NO Iv: NO

Wait: 0.032s Loc: (546.656, 276.188) Pr: 1 Ti: 1 Ro: -0.75 Rv: NO Iv: NO

Wait: 0.033s Loc: (565.328, 273.594) Pr: 1 Ti: 1 Ro: -0.75 Rv: NO Iv: NO

Wait: 0.031s Loc: (581.664, 272.297) Pr: 1 Ti: 1 Ro: -0.75 Rv: NO Iv: NO

Wait: 0.017s Loc: (599, 272) Pr: 1 Ti: 1 Ro: -0.75 Rv: NO Iv: NO

</StrokeEvent>

//===========================================================================

// End of Script

//===========================================================================

That script is actually recorded and generated by this app "ArtRage" for iPad that allow for ArtRage on desktop to be read back. Their script documentation is as below:

http://www.artrage.com/files/artrage_advancedscriptingguide.pdf

Actually for my case, I just need Houdini to read back the Loc: (X, Y) and connect them as curve, if it is within 1 Stroke Event.

My question is:

How to import point data like above Loc: (X, Y) into Houdini? I supposed this script is really simple to import using Python?

I will check for Houdini python documentation also maybe it could lead to some solution.

Thank you.

- Jimmy

Edited November 21, 2011 by enzym

Erik_JE · November 21, 2011

Yes Python sounds like a nice solution. I would make a Python SOP with a fancy regexp to only grab the 'Loc:' from the file and then create points.

I might be back with some file later when I am home from work if no one else haven't already made it.

Green-Man · November 21, 2011

It's really not a straightforward list of coordinates I think. There are several types of Loc: () in such kind of a structure. And it may happen that some coordinates (<PrevA>,<PrevB>) we should use not like a simple X,Y. But its just the details.

And you probably lost </Events> at the end of the // End of Script. Its necessary for properly parsing this XML.

This is a sample code for parsing XML with elementtree and parsing strings with re. These modules are standard for python (and hython:)

It creates primitives with points just with the coordinates that stores inside a <StrokeEvent></StrokeEvent> and tail of <StrokeHeader>.

Points of <EventPt>, <Smooth>, <PrevA> and <PrevB> are ignored. But its not so difficult task to modify this code for this purpose

import re                  
import _elementtree as ET

filename = "code.txt"                #Path to the file
file = open(filename, 'r')

#Rule for splitting long string like Wait: 0.000s Loc: (372, 195) Pr: 1 Ti: 1 Ro: -0.75 Rv: NO Iv: NO
#with round brackets
mainrule = re.compile(r'([()])')

#Rule for splitting coordinates pair by commas.
commarule = re.compile(r'([,])')


coords =[]
geo = hou.pwd().geometry()

#Parsing XML and generating arrays of coordinates for every &lt;StrokeEvent&gt;
tree = ET.parse(filename)
root = tree.getroot()
for event in root:
        curvelength = 0
        coords = []
        for header in event:
                list = mainrule.split(header.tail)
                for i,item in zip(range(len(list)), list):
                        if item.endswith("Loc: "):         
                                x = commarule.split(list[i+2])[0]
                                y = commarule.split(list[i+2])[2]
                                coords.append([float(x),float(y),0])                                 

                #Creating geometry itself
                pointarray = geo.createPolygon()
                for p in coords:
                    point = geo.createPoint()
                    point.setPosition(p)
                    pointarray.addVertex(point)

                #It will help to get other the points from the other elements
                # for subitem in header:
                        # print "-&gt;                     Item = "+subitem.tag
                        # print subitem.text

enzym · November 30, 2011

Hmmmm... that seems to be more complicated that I thought. I will keep this reference for in the future when I understand Python better.

Thanks for all the responses.

-J

enzym · December 2, 2011

I found the answer in other post. It sort of leading the right direction.

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Importing Point Data

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