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#!/usr/bin/env python
"""This example shows how you can produce contours on an IsoSurface.
"""
# Author: Prabhu Ramachandran <prabhu [at] aero . iitb . ac . in>
# Copyright (c) 2008, Enthought, Inc.
# License: BSD Style.
# Standard library imports
from os.path import join, abspath, dirname
# Mayavi imports.
from mayavi.scripts import mayavi2
from mayavi.sources.api import VTKXMLFileReader
from mayavi.filters.contour import Contour
from mayavi.filters.api import PolyDataNormals
from mayavi.filters.set_active_attribute import SetActiveAttribute
from mayavi.modules.api import Surface, Outline
@mayavi2.standalone
def main():
mayavi.new_scene()
# Read the example data: fire_ug.vtu.
r = VTKXMLFileReader()
filename = join(mayavi2.get_data_dir(dirname(abspath(__file__))),
'fire_ug.vtu')
r.initialize(filename)
mayavi.add_source(r)
# Set the active point scalars to 'u'.
r.point_scalars_name = 'u'
# Simple outline for the data.
o = Outline()
mayavi.add_module(o)
# Branch the pipeline with a contour -- the outline above is
# directly attached to the source whereas the contour below is a
# filter and will branch the flow of data. An isosurface in the
# 'u' data attribute is generated and normals generated for it.
c = Contour()
mayavi.add_filter(c)
n = PolyDataNormals()
mayavi.add_filter(n)
# Now we want to show the temperature 't' on the surface of the 'u'
# iso-contour. This is easily done by using the SetActiveAttribute
# filter below.
aa = SetActiveAttribute()
mayavi.add_filter(aa)
aa.point_scalars_name = 't'
# Now view the iso-contours of 't' with a Surface filter.
s = Surface(enable_contours=True)
mayavi.add_module(s)
if __name__ == "__main__":
main()
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