Hi,
I try to display the surface of sphere which is cut in two and I would like
that the two hemispheres are independent.
For example, I would like to be able to change the color of one half of the
sphere.
But when I try to do that I change the color of two hemispheres :
##############################
# Code
##############################
import numpy as np
##############################
# Define the sphere cut in two
##############################
xdim, ydim, zdim = 50, 50, 50
vx, vy, vz = 1., 1., 1.
R = 25
cx = 25
cy = 25
cz = 25
data = np.zeros([xdim, ydim, zdim],np.uint8)
for i in xrange(xdim):
for j in xrange(ydim):
for k in xrange(zdim):
if (i * vx - cx)**2 + (j * vy - cy)**2 + (k * vz - cz)**2 < (R * R)
:
data[i,j,k] = 1
data[:,:,24:26] = 0
##########################################################
# Using of "Tvtk segmentation example" from mayavi
# to display the sphere
##########################################################
from enthought.mayavi import mlab
from enthought.tvtk.api import tvtk
fig = mlab.figure(bgcolor=(0, 0, 0), size=(400, 500))
fig.scene.disable_render = True
src = mlab.pipeline.scalar_field(data)
src.update_image_data = True
contour = mlab.pipeline.contour(src, )
#contour.filter.contours = [1,]
contour.filter.number_of_contours = 2
#connect_ = tvtk.PolyDataConnectivityFilter(extraction_mode=4)
connect_ = tvtk.PolyDataConnectivityFilter(extraction_mode=5)
connect = mlab.pipeline.user_defined(contour, filter=connect_)
surf = mlab.pipeline.surface(connect,color=(0.9, 0.72, 0.62))
###########################################################
# Using of the "on_mouse_pick" method of the scene
# to change the color
##########################################################
def picker_callback(picker_obj):
print picker_obj.mapper_position
print 'try to change the color'
picker_obj.actor.property.color = (1,0,0)
fig.on_mouse_pick(picker_callback,type='cell')
Is there a way to do that ?
What is wrong with my implementation ?
Thanks for your help.
Eric
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