edem生成颗粒后 ，输出颗粒中粘附的颗粒团中颗粒团的形貌的代码

以下是一个简单的示例代码，用于在edem中输出颗粒团中颗粒的形貌：

import numpy as np
from edempy import Box, Quaternion, Vec3, EDEM_Connector

# Initialize EDEM connection
edem = EDEM_Connector()

# Load simulation file
edem.openFile("simulation.dem")

# Get all particles and particle groups
particles = edem.getParticles()
groups = edem.getGroups()

# Select the group of interest
group_name = "my_group"
my_group = groups[group_name]

# Get a list of all the particles in the selected group
group_particles = my_group.getParticles()

# Get the positions of all the particles in the selected group
positions = np.array([p.getPosition() for p in group_particles])

# Calculate the center of mass of the group
com = np.mean(positions, axis=0)

# Calculate the orientation of the group
cov_matrix = np.cov(positions.T)
eigenvalues, eigenvectors = np.linalg.eig(cov_matrix)
max_index = np.argmax(eigenvalues)
orientation = Quaternion.fromRotationMatrix(eigenvectors.T)

# Rotate the positions of the particles to the orientation of the group
rotated_positions = orientation.rotate(positions - com) + com

# Calculate the bounding box of the group
min_coords = np.min(rotated_positions, axis=0)
max_coords = np.max(rotated_positions, axis=0)
bbox = Box(Vec3(*min_coords), Vec3(*max_coords))

# Export the geometry of the group as a mesh file
edem.exportMesh("group_mesh.obj", bbox=bbox, particle_list=group_particles)

这个示例代码假设你已经在edem中生成了一个名为“my_group”的颗粒团，并且想要输出该颗粒团中所有颗粒的形貌。代码首先获取了所有的颗粒和颗粒团，然后选择了名为“my_group”的颗粒团，并从中获取了所有颗粒的位置。代码使用这些颗粒的位置计算了颗粒团的中心点和方向，并将颗粒的位置旋转到颗粒团的方向。最后，代码使用edem的导出功能将颗粒团的几何形状导出为一个OBJ文件。你可以在其他软件中打开该文件，以查看颗粒的形貌。