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- import igl
- V = igl.eigen.MatrixXd()
- F = igl.eigen.MatrixXi()
- N_vertices = igl.eigen.MatrixXd()
- N_faces = igl.eigen.MatrixXd()
- N_corners = igl.eigen.MatrixXd()
- # This function is called every time a keyboard button is pressed
- def key_pressed(viewer, key, modifier):
- if key == ord('1'):
- viewer.data.set_normals(N_faces)
- return True
- elif key == ord('2'):
- viewer.data.set_normals(N_vertices)
- return True
- elif key == ord('3'):
- viewer.data.set_normals(N_corners)
- return True
- return False
- # Load a mesh in OFF format
- igl.readOFF("../tutorial/shared/fandisk.off", V, F);
- # Compute per-face normals
- N_faces = igl.eigen.MatrixXd()
- igl.per_face_normals(V,F,N_faces)
- # Compute per-vertex normals
- N_vertices = igl.eigen.MatrixXd()
- igl.per_vertex_normals(V,F,igl.PER_VERTEX_NORMALS_WEIGHTING_TYPE_AREA,N_vertices)
- # Compute per-corner normals, |dihedral angle| > 20 degrees --> crease
- N_corners = igl.eigen.MatrixXd()
- igl.per_corner_normals(V,F,20,N_corners)
- # Plot the mesh
- viewer = igl.viewer.Viewer()
- viewer.callback_key_pressed = key_pressed
- viewer.core.show_lines = False
- viewer.data.set_mesh(V, F)
- viewer.data.set_normals(N_faces)
- print("Press '1' for per-face normals.")
- print("Press '2' for per-vertex normals.")
- print("Press '3' for per-corner normals.")
- viewer.launch()
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