moved python tutorials in a folder, doing a pass to make them python 3 compatible

2015-10-05 15:30:39 +02:00
parent 5e7a2ae3da
commit 3ae8d0c1a9
27 changed files with 117 additions and 30 deletions
@@ -0,0 +1,54 @@
+# 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()
+
+# Load a mesh in OFF format
+igl.readOFF("../../tutorial/shared/cheburashka.off", V, F)
+
+# Read scalar function values from a file, U: #V by 1
+U = igl.eigen.MatrixXd()
+igl.readDMAT("../../tutorial/shared/cheburashka-scalar.dmat",U)
+U = U.col(0)
+
+# Compute gradient operator: #F*3 by #V
+G = igl.eigen.SparseMatrixd()
+igl.grad(V,F,G)
+
+# Compute gradient of U
+GU = (G*U).MapMatrix(F.rows(),3)
+
+# Compute gradient magnitude
+GU_mag = GU.rowwiseNorm()
+
+viewer = igl.viewer.Viewer()
+viewer.data.set_mesh(V, F)
+
+# Compute pseudocolor for original function
+C = igl.eigen.MatrixXd()
+
+igl.jet(U,True,C)
+
+# Or for gradient magnitude
+# igl.jet(GU_mag,True,C)
+
+viewer.data.set_colors(C);
+
+# Average edge length divided by average gradient (for scaling)
+max_size = igl.avg_edge_length(V,F) / GU_mag.mean()
+
+# Draw a black segment in direction of gradient at face barycenters
+BC = igl.eigen.MatrixXd()
+igl.barycenter(V,F,BC)
+
+black = igl.eigen.MatrixXd([[0.0,0.0,0.0]])
+viewer.data.add_edges(BC,BC+max_size*GU, black)
+
+# Hide wireframe
+viewer.core.show_lines = False
+
+viewer.launch()