Question

在尝试编写代码以选择Mayavi中由三角形网格（连接它们的点和三角形）定义的表面时，我遇到了麻烦。

我已经尝试了以下方法：

from mayavi import mlab
from numpy import array
################################################################################
# define data
D = 150
B = 100
H = 100
L = 50
# defining coordinates of points 
x = array([0, 0, D, D])
y = array([B, B/2, B/2, B])
z = array([0, 0, 0, 0])
# defining the 2 triangles to construct surface
triangles = array([(0, 1, 2), 
                   (0, 2, 3)])

################################################################################
# Plot the data
fig = mlab.figure(1)
mlab.clf()
# Plot a plane with a triangular mesh constructed with above-defined data 
plane = mlab.triangular_mesh(x, y, z, triangles, 
                             transparent=False,
                             resolution=10,
                             color=(0.5,0.3,0.5)) 
# Plot the cursor which will be updated at each click on the plane 
cursor3d = mlab.points3d(0., 0., 0., 
                         mode='axes',
                         color=(0, 0, 0),
                         scale_factor=1)
mlab.title('Click on the plane')
mlab.view(180, 0)

################################################################################
# Some logic to select 'mesh' and the data index when picking.
def picker_callback(picker_obj):
    # retrieve VTK actors of picked objects
    picked = picker_obj.actors
    if plane.actor.actor._vtk_obj in [o._vtk_obj for o in picked]:
         # Get mouse position on-click 
        position = picker_obj.pick_position
        # Move the cursor in scene according to new clicked coordinates
        cursor3d.mlab_source.reset(x=position[0],
                                   y=position[1],
                                   z=position[2])

# Connecting picker_callback to the figure
fig.on_mouse_pick(picker_callback)
# show the fig
mlab.show()

但是很显然，单击表面时，选择器只能识别由（x，y，z）定义的表面顶点。我想单击的是我可以在表面上能够找到的点坐标。

我已经尝试调整选择器的容忍度，但是没有结果。

我也试图借助100 * 100数组中的outline3d函数来实现。自从选择器感知到轮廓3d生成的字形以来，它就起作用了，但是数据太多了，什么也没做，并且与triangle_mesh函数相比，绘制时间太长了。

有什么想法吗？

单击由三角形网格mayavi定义的表面

0 个答案: