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- import sys, os
- # Add the igl library to the modules search path
- sys.path.insert(0, os.getcwd() + "/../")
- import pyigl as igl
- from shared import TUTORIAL_SHARED_PATH, check_dependencies
- dependencies = ["viewer"]
- check_dependencies(dependencies)
- # Mesh with per-face color
- V = igl.eigen.MatrixXd()
- F = igl.eigen.MatrixXi()
- C = igl.eigen.MatrixXd()
- viewer = igl.viewer.Viewer()
- def mouse_down(viewer, a, b):
- bc = igl.eigen.MatrixXd()
- # Cast a ray in the view direction starting from the mouse position
- fid = igl.eigen.MatrixXi([-1])
- coord = igl.eigen.MatrixXd([viewer.current_mouse_x, viewer.core.viewport[3] - viewer.current_mouse_y])
- hit = igl.unproject_onto_mesh(coord, viewer.core.view * viewer.core.model,
- viewer.core.proj, viewer.core.viewport, V, F, fid, bc)
- if hit:
- C.setRow(fid[0, 0], igl.eigen.MatrixXd([[1, 0, 0]]))
- viewer.data.set_colors(C)
- return True
- return False
- print("Usage: [LeftMouseClick] to select a face")
- # Load a mesh in OFF format
- igl.readOFF(TUTORIAL_SHARED_PATH + "fertility.off", V, F)
- # Initialize white
- C.setConstant(F.rows(), 3, 1.0)
- viewer.data.set_mesh(V, F)
- viewer.data.set_colors(C)
- viewer.core.show_lines = False
- viewer.callback_mouse_down = mouse_down
- viewer.launch()
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