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I would like to import (or parse ??) a WRL/VRML file format in python in order to work the data with Matplotlib. Is there any way of converting this file format into plottable numpy arrays ?

I attached a photo a WRL file visualized with the FreeWRL viewer enter image description here

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  • $\begingroup$ I am not really sure if this question is more suitable for stackoverflow.com $\endgroup$ – SAAD May 4 '14 at 3:25
  • $\begingroup$ I'd try looking at PyVRML or ScientificPython to start. $\endgroup$ – Geoff Oxberry May 4 '14 at 4:50
  • $\begingroup$ I stumbled on it while searching but I couldnt find a decent documentation not to mention that the Github repository links are broken ! $\endgroup$ – SAAD May 4 '14 at 10:56
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{Assuming you still need the code} Let A1.wrl is your wrl file.

import matplotlib.pyplot as plt
from mpl_toolkits.mplot3d import Axes3D
import numpy as np
import re
holder = []
with open("A1.wrl", "rb") as vrml:
    for lines in vrml:
        a = re.findall("[-0-9]{1,3}.[0-9]{6}", lines)
        if len(a) == 3:
            holder.append(map(float, a))

holder_array = np.array(holder) #if you want numpy array

#3D Plotting
x,y,z = zip(*holder)
fig = plt.figure()
ax = Axes3D(fig)
ax.plot(x,y,z)
plt.show()

My A.wrl: http://pastebin.com/PeVXbR5C

File generate:

enter image description here

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  • $\begingroup$ what version of wrl files are you using ? I tested it but no regular expression are found, and the numpy array are empty. $\endgroup$ – SAAD Aug 21 '14 at 11:50
  • $\begingroup$ @SAAD: #VRML V2.0 utf8 $\endgroup$ – Devashish Das Aug 21 '14 at 12:53
  • $\begingroup$ your A.wrl file works, but I think your python script doesnt work with my file B.wrl (pastebin.com/HCVjqETa) $\endgroup$ – SAAD Aug 21 '14 at 14:10
  • $\begingroup$ @SAAD: My code is just an example. You can just change the regex according to what you want to get and it will do it. In your files there are more than one place to get the coordinates and the numbers are in 2E-01 format, your code have to just catch that. $\endgroup$ – Devashish Das Aug 22 '14 at 4:12
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    $\begingroup$ Actually i am very familiarbwith re module, nonethless i ll take a look at yourr wrl file to see how you did it. For this, you have also my up vote also. $\endgroup$ – SAAD Aug 22 '14 at 22:22

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