def vertices_triangles(a, b, c):
edge_list = []
vert_list = [[0, 0, c], [0, 0, c], [0, 0, c], [0, 0, c]]
my_polydata = vtk.vtkPolyData() #Initialize the polydata
for v in v_range:
z_new = c * np.cos(np.deg2rad(v))
n = len(vert_list)
vert_list.append([a * np.sin(np.deg2rad(v)), 0.0, z_new])
vert_list.append([0.0, b * np.sin(np.deg2rad(v)), z_new])
vert_list.append([-1 * a * np.sin(np.deg2rad(v)), 0.0, z_new])
vert_list.append([0.0, -1 * b * np.sin(np.deg2rad(v)), z_new])
edge_list.append([n - 4, n, n - 3])
edge_list.append([n, n + 1, n - 3])
edge_list.append([n - 3, n + 1, n - 2])
edge_list.append([n + 1, n + 2, n - 2])
edge_list.append([n - 2, n + 2, n - 1])
edge_list.append([n + 2, n + 3, n - 1])
edge_list.append([n - 1, n + 3, n - 4])
edge_list.append([n + 3, n, n - 4])
#Converting the list to an array
my_vertices = np.array(vert_list)
my_triangles = np.array(edge_list)
#Converting the vertices and faces to a Polydata
ut_vtk.set_polydata_vertices(my_polydata, my_vertices)
ut_vtk.set_polydata_triangles(my_polydata, my_triangles.astype('i8'))
# Setting colors for the sphere
sphere_vertices = ut_vtk.get_polydata_vertices(my_polydata)
colors = sphere_vertices * 255
ut_vtk.set_polydata_colors(my_polydata, colors)
sphere_actor = ut_vtk.get_actor_from_polydata(my_polydata)
return sphere_actor
Create a cube with vertices and triangles as numpy arrays
"""
my_vertices = np.array([[0.0, 0.0, 0.0], [0.0, 0.0, 1.0], [0.0, 1.0, 0.0],
[0.0, 1.0, 1.0], [1.0, 0.0, 0.0], [1.0, 0.0, 1.0],
[1.0, 1.0, 0.0], [1.0, 1.0, 1.0]])
# the data type for vtk is needed to mention here, numpy.int64
my_triangles = np.array(
[[0, 6, 4], [0, 2, 6], [0, 3, 2], [0, 1, 3], [2, 7, 6], [2, 3, 7],
[4, 6, 7], [4, 7, 5], [0, 4, 5], [0, 5, 1], [1, 5, 7], [1, 7, 3]],
dtype='i8')
"""
Set vertices and triangles in the ``vtkPolyData``
"""
ut_vtk.set_polydata_vertices(my_polydata, my_vertices)
ut_vtk.set_polydata_triangles(my_polydata, my_triangles)
"""
Save the ``vtkPolyData``
"""
file_name = "my_cube.vtk"
io_vtk.save_polydata(my_polydata, file_name)
print("Surface saved in " + file_name)
"""
Load the ``vtkPolyData``
"""
cube_polydata = io_vtk.load_polydata(file_name)
"""
add color based on vertices position
[0, 1, 3],
[2, 7, 6],
[2, 3, 7],
[4, 6, 7],
[4, 7, 5],
[0, 4, 5],
[0, 5, 1],
[1, 5, 7],
[1, 7, 3]],dtype='i8')
"""
Set vertices and triangles in the ``vtkPolyData``
"""
ut_vtk.set_polydata_vertices(my_polydata, my_vertices)
ut_vtk.set_polydata_triangles(my_polydata, my_triangles)
"""
Save the ``vtkPolyData``
"""
file_name = "my_cube.vtk"
io_vtk.save_polydata(my_polydata, file_name)
print("Surface saved in " + file_name)
"""
Load the ``vtkPolyData``
"""
cube_polydata = io_vtk.load_polydata(file_name)
def sphere(centers, colors, radii=1., theta=16, phi=16,
vertices=None, faces=None):
""" Visualize one or many spheres with different colors and radii
Parameters
----------
centers : ndarray, shape (N, 3)
colors : ndarray (N,3) or (N, 4) or tuple (3,) or tuple (4,)
RGB or RGBA (for opacity) R, G, B and A should be at the range [0, 1]
radii : float or ndarray, shape (N,)
theta : int
phi : int
vertices : ndarray, shape (N, 3)
faces : ndarray, shape (M, 3)
If faces is None then a sphere is created based on theta and phi angles
If not then a sphere is created with the provided vertices and faces.
Returns
-------
vtkActor
Examples
--------
>>> from dipy.viz import window, actor
>>> ren = window.Renderer()
>>> centers = np.random.rand(5, 3)
>>> sphere_actor = actor.sphere(centers, window.colors.coral)
>>> ren.add(sphere_actor)
>>> # window.show(ren)
"""
if np.array(colors).ndim == 1:
colors = np.tile(colors, (len(centers), 1))
if isinstance(radii, (float, int)):
radii = radii * np.ones(len(centers), dtype='f8')
pts = numpy_to_vtk_points(np.ascontiguousarray(centers))
cols = numpy_to_vtk_colors(255 * np.ascontiguousarray(colors))
cols.SetName('colors')
radii_fa = numpy_support.numpy_to_vtk(
np.ascontiguousarray(radii.astype('f8')), deep=0)
radii_fa.SetName('rad')
polydata_centers = vtk.vtkPolyData()
polydata_sphere = vtk.vtkPolyData()
if faces is None:
src = vtk.vtkSphereSource()
src.SetRadius(1)
src.SetThetaResolution(theta)
src.SetPhiResolution(phi)
else:
ut_vtk.set_polydata_vertices(polydata_sphere, vertices)
ut_vtk.set_polydata_triangles(polydata_sphere, faces)
polydata_centers.SetPoints(pts)
polydata_centers.GetPointData().AddArray(radii_fa)
polydata_centers.GetPointData().SetActiveScalars('rad')
polydata_centers.GetPointData().AddArray(cols)
glyph = vtk.vtkGlyph3D()
if faces is None:
glyph.SetSourceConnection(src.GetOutputPort())
else:
if major_version <= 5:
glyph.SetSource(polydata_sphere)
else:
glyph.SetSourceData(polydata_sphere)
if major_version <= 5:
glyph.SetInput(polydata_centers)
else:
glyph.SetInputData(polydata_centers)
glyph.Update()
mapper = vtk.vtkPolyDataMapper()
if major_version <= 5:
mapper.SetInput(glyph.GetOutput())
else:
mapper.SetInputData(glyph.GetOutput())
mapper.SetScalarModeToUsePointFieldData()
mapper.SelectColorArray('colors')
actor = vtk.vtkActor()
actor.SetMapper(mapper)
return actor