reorganized folder and added a README

2015-09-21 18:18:53 +02:00
parent 4f09e3647a
commit dac8daaffa
4 changed files with 159 additions and 0 deletions
@@ -0,0 +1,59 @@
+V = py.igl.eigen.MatrixXd();
+F = py.igl.eigen.MatrixXi();
+py.igl.read_triangle_mesh('../tutorial/shared/fertility.off', V, F);
+
+% Alternative discrete mean curvature
+HN = py.igl.eigen.MatrixXd();
+L = py.igl.eigen.SparseMatrixd();
+M = py.igl.eigen.SparseMatrixd();
+Minv = py.igl.eigen.SparseMatrixd();
+
+
+py.igl.cotmatrix(V,F,L)
+py.igl.massmatrix(V,F,py.igl.MASSMATRIX_TYPE_VORONOI,M)
+
+py.igl.invert_diag(M,Minv)
+
+% Laplace-Beltrami of position
+HN = -Minv*(L*V)
+
+% Extract magnitude as mean curvature
+H = HN.rowwiseNorm()
+
+% Compute curvature directions via quadric fitting
+PD1 = py.igl.eigen.MatrixXd()
+PD2 = py.igl.eigen.MatrixXd()
+
+PV1 = py.igl.eigen.MatrixXd()
+PV2 = py.igl.eigen.MatrixXd()
+
+py.igl.principal_curvature(V,F,PD1,PD2,PV1,PV2)
+
+% Mean curvature
+H = 0.5*(PV1+PV2)
+
+viewer = py.igl.viewer.Viewer()
+viewer.data.set_mesh(V, F)
+
+% Compute pseudocolor
+C = py.igl.eigen.MatrixXd()
+py.igl.parula(H,true,C)
+
+viewer.data.set_colors(C)
+
+% Average edge length for sizing
+avg = py.igl.avg_edge_length(V,F)
+
+% Draw a blue segment parallel to the minimal curvature direction
+red = py.iglhelpers.p2e(py.numpy.array([[0.8,0.2,0.2]]))
+blue = py.iglhelpers.p2e(py.numpy.array([[0.2,0.2,0.8]]))
+
+viewer.data.add_edges(V + PD1*avg, V - PD1*avg, blue)
+
+% Draw a red segment parallel to the maximal curvature direction
+viewer.data.add_edges(V + PD2*avg, V - PD2*avg, red)
+
+% Hide wireframe
+viewer.core.show_lines = false
+
+viewer.launch()
@@ -0,0 +1,12 @@
+% Load a mesh in OFF format
+V = py.igl.eigen.MatrixXd();
+F = py.igl.eigen.MatrixXi();
+py.igl.readOFF('../tutorial/shared/beetle.off', V, F);
+
+V
+
+% Plot the mesh
+viewer = py.tcpviewer.TCPViewer()
+viewer.data.set_mesh(V, F)
+viewer.launch()
+