libigl_Martin/python/tutorial/302_Sort.py

# Add the igl library to the modules search path
import sys, os
sys.path.insert(0, os.getcwd() + "/../")

import igl

V = igl.eigen.MatrixXd()
F = igl.eigen.MatrixXi()

igl.readOFF("../../tutorial/shared/decimated-knight.off",V,F)

# Sort barycenters lexicographically
BC = igl.eigen.MatrixXd()
sorted_BC = igl.eigen.MatrixXd()

igl.barycenter(V,F,BC);

I = igl.eigen.MatrixXi()
J = igl.eigen.MatrixXi()

# sorted_BC = BC(I,:)
igl.sortrows(BC,True,sorted_BC,I)

# Get sorted "place" from sorted indices
J.resize(I.rows(),1)
# J(I) = 1:numel(I)

igl.slice_into(igl.coloni(0,I.size()-1),I,J)

# Pseudo-color based on sorted place
C = igl.eigen.MatrixXd()
igl.jet(J.castdouble(),True,C)

# Plot the mesh with pseudocolors
viewer = igl.viewer.Viewer()
viewer.data.set_mesh(V, F)
viewer.data.set_colors(C)
viewer.launch()