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OVITO的Python库常用命令

  • 2026-03-08 20:09:44
OVITO的Python库常用命令

OVITO与matplotlib不兼容的问题

在导入OVITO之前,要先设置环境变量,matplotlib导入顺序没有要求:

import osos.environ['OVITO_GUI_MODE'] = '1'from ovito.io import import_fileimport matplotlib.pyplot as pltplt.plot([1,2])plt.show()

导入并分析dump文件

from ovito.io import import_file

导入单个文件

pipeline = import_file("simulation.dump")

导入LAMMPS中用通配符生成的一系列文件

pipeline = import_file('path/*.dump')

导入列表中的所有文件

file_list = ["dir_a/simulation.dump","dir_b/simulation.dump","dir_c/simulation.dump"]pipeline = import_file(file_list)

查看当前导入的有多少帧

print(pipeline.source.num_frames)

计算某一帧的数据

for frame in range(pipeline.source.num_frames):    data = pipeline.compute(frame)    ...

从原则上是,compute 接受的 frame 应该是0至 num_frames-1 之间的数,这样刚好是 num_frames 帧。实际操作中,我发现这个 frame 参数可以是0至任意大的数,如果这个 frame 超过了 num_frames,就会以 num_frames-1 的值作为结果。

dump文件中的各变量值都储存在 data.particles 里面,怎么访问呢,这个 data.particles 是个类似于字典的对象,可以用 keys 方法查看有哪些键:

print(list(data.particles.keys()))

['Particle Identifier', 'Particle Type', 'Position', 'Velocity', 'v_r_stretch', 'c_rho_peratom', 'c_ave_eps', 'v_fp', 'v_rdist', 'Velocity Magnitude']

我dump文件本来储存的是以下变量:

id type xs ys zs vx vy vz v_r_stretch c_rho_peratom c_ave_eps v_FP v_rDist

可以发现变量名自动发生了一些变化,比如id变成了Particle Identifier,xs、ys、zs变成了Position,vx、vy、vz变成了Velocity,自定义的变量名中的大写字母变成了小写,比如v_FP变成了v_fp等等。这个OVITO文档里面列举了不少,可以自己去看LAMMPS dump file reader — OVITO User Manual 3.10.6 documentation

然后我们就可以像字典一样访问这些键的值:

ids = data.particles['Particle Identifier']

这样获取到的 ids 对象类型是 ovito.data.Property,有点像 numpy.ndarray,可以取索引的值,有shape、size,可以传给matplotlib画图,但是似乎没有numpy.ndarray的那些方法(maxmin 什么的)。我们可以用 np.asarray 把它转换为 numpy.ndarray,还有一种更方便的操作,就是直接用他自己的array属性:

print(ids.array.__class__)print(ids.array.mean())

numpy.ndarray

np.float64(4676.5)

另外,如果对 ovito.data.Property 取索引对应的值的话,也是直接返回一个 numpy.ndarray 的,不需要再用array属性转换了:

print(ids[:250].__class__)print(ids[:250].mean())

numpy.ndarray

125.5

注:矢量的分量(如data.particles['Force.Y'])是numpy.ndarray,但矢量本身(如data.particles['Force'])仍是ovito.data.Property

我们把ids试着用matplotlib画出来:

plt.plot(ids)plt.show()

可以发现,id是乱序的,这就是默认的导入方式造成的(除非LAMMPS中就指定了 dump_modify sort id)。为了让OVITO按id顺序读取各原子,我们需要在 import_file 中指定 sort_particles=True,这样就可以方便后面分析了。

渲染为图片或视频

切记:要在导入ovito之前,设置好环境变量。

import osos.environ['OVITO_GUI_MODE'] = '1'from ovito.io import import_filefrom ovito.modifiers import SelectTypeModifier, ColorCodingModifierfrom ovito.vis import Viewportpipeline = import_file(...)pipeline.modifiers.extend([...])for frame in range(pipeline.source.num_frames):    data = pipeline.compute(frame)    data.cell.vis.enabled = False# 去掉simulation cell    data.particles.vis.radius = 2e-5# 调整颗粒半径pipeline.add_to_scene()vp = Viewport()vp.type = Viewport.Type.Top # Top视图vp.zoom_all() # 缩放到合适的尺寸vp.render_image(filename='test.png')vp.render_anim(size=(600600), filename=f'{output_path}\\animation.mp4', fps=20)

各种Modifiers

ovito.modifiers — OVITO Python Reference 3.11.2 documentation

pipeline.modifiers.extend([    SelectTypeModifier(types={1}),    DeleteSelectedModifier(operate_on={'particles'}),])

表达式选择

cond = ['ParticleType==2','abs(Position.Y^2+(Position.Z-0.003)^2-0.002^2)<1e-9','Position.X>0.002','Position.X<0.007']cond = '&&'.join(cond)pipeline.modifiers.extend(    [mod.ExpressionSelectionModifier(expression=cond),     mod.InvertSelectionModifier(),     mod.DeleteSelectedModifier(operate_on={'particles'})])

渲染LAMMPS区域

注意:commands中的旋转角度应当是弧度。

pipeline.modifiers.extend([    RenderLAMMPSRegionsModifier(        commands='region anal_del block 0.0034641 0.007 -0.002 0.002 -0.002 0 rotate 'f'1.57 0.0034641 0 -0.002 0 1 0',        color_by_region=True    )])

各种Overlay

vp.overlays.extend([    ColorLegendOverlay(        modifier=pipeline.modifiers[1], # ColorCoding        title='v_y (m/s)',        alignment=QtCore.Qt.AlignmentFlag.AlignTop | QtCore.Qt.AlignmentFlag.AlignHCenter,        offset_x=0, offset_y=-0.1316,        font_size=0.098, font='Arial', legend_size=0.36, label_size=0.89,        aspect_ratio=4.2    ),    TextLabelOverlay(        text=f't=[Time] second', font='Arial', font_size=0.053,        alignment=QtCore.Qt.AlignmentFlag.AlignTop | QtCore.Qt.AlignmentFlag.AlignHCenter,        offset_x=0, offset_y=-0.1992, text_color=(000)    )])

alignment必须规定横向位置和纵向位置,用 | 连接。offset是相对于 alignment 规定位置的偏移量。

邻居搜索

ovito.data — OVITO Python Reference 3.11.2 documentation

h = 2 * dLdata = pipeline.compute(frame)finder = CutoffNeighborFinder(h, data)

找空间任意一点的cutoff范围内的颗粒用 find_at(coords)。但是只能逐点查找,也就是说 coords 只能是单个点的坐标,不能是一堆点的坐标(与scipy的cKDTree不同)。

numerator = np.zeros((n_sample, 3))denominator = np.zeros((n_sample, 1))for i in trange(n_sample):    neighs = finder.find_at(xyz[i, :])for neigh in neighs:        j = neigh.index        w = kernel(neigh.distance, h)        numerator[i] += v[j] * w * mass[j] / rho[j]        denominator[i] += w * mass[j] / rho[j]

找某个颗粒的邻居颗粒用 find(index) 方法找单个颗粒的邻居,或用 find_all(indices=None, sort_by=None) 一次性找所有颗粒的邻居。

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  1. CONNECT:[ UseTime:0.000894s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001326s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000716s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.005210s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001416s ]
  6. SELECT * FROM `set` [ RunTime:0.000653s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001590s ]
  8. SELECT * FROM `article` WHERE `id` = 478780 LIMIT 1 [ RunTime:0.005867s ]
  9. UPDATE `article` SET `lasttime` = 1774646889 WHERE `id` = 478780 [ RunTime:0.003305s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000768s ]
  11. SELECT * FROM `article` WHERE `id` < 478780 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.007038s ]
  12. SELECT * FROM `article` WHERE `id` > 478780 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001065s ]
  13. SELECT * FROM `article` WHERE `id` < 478780 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.021954s ]
  14. SELECT * FROM `article` WHERE `id` < 478780 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.018263s ]
  15. SELECT * FROM `article` WHERE `id` < 478780 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.013595s ]
0.260914s