84 lines
No EOL
2.1 KiB
Python
84 lines
No EOL
2.1 KiB
Python
import numpy as np
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# Number of circumferential faces (should be even number)
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n_faces = 36
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# Outer Radius
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ro = 22. # mm
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# Width
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w = 2.8 # mm
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# Circumference / Width
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aspect = 2 * np.pi * ro / w
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print(aspect)
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# Ratio - Circumferential faces upper and lower side
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ratio = 2/(1+np.sqrt(5))# 0 ~ 1
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ratio = np.max([0., ratio])
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ratio = np.min([1., ratio])
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offset = 2 * ratio - 1.
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pdo = self.GetPolyDataOutput()
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dtheta = 2 * np.pi / n_faces
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multiplier = np.arange(n_faces, dtype=np.double)
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multiplier[1::2] = multiplier[1::2] + offset
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theta = multiplier * dtheta
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x = ro * np.sin(theta)
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y = ro * np.cos(theta)
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torsion = dtheta + 0.0*dtheta
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sin_dtheta = np.sin(torsion)
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cos_dtheta = np.cos(torsion)
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# rotation_mat = np.array([cos_dtheta, - sin_dtheta, sin_dtheta, cos_dtheta]).reshape((2,2))
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x_ = cos_dtheta * x - sin_dtheta * y
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y_ = sin_dtheta * x + cos_dtheta * y
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x1 = np.concatenate((x_[1:], x_[:1]))
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y1 = np.concatenate((y_[1:], y_[:1]))
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nodes = vtk.vtkPoints()
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for i, (xi, yi) in enumerate(zip(x, y)):
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nodes.InsertNextPoint(xi, yi, 0.0)
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for i, (xi, yi) in enumerate(zip(x1, y1)):
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nodes.InsertNextPoint(xi, yi, w)
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elements = vtk.vtkCellArray()
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for i in range(n_faces):
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# Create the object that stores the list of nodeIDs
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elementIdList0 = vtk.vtkIdList()
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# Insert the nodeIDs in the appropriate order.
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i_next = (i + 1) % n_faces
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elementIdList0.InsertNextId(i)
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elementIdList0.InsertNextId(i+n_faces)
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elementIdList0.InsertNextId(i_next+n_faces)
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elementIdList0.InsertNextId(i_next)
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elements.InsertNextCell(elementIdList0)
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elementIdListTop = vtk.vtkIdList()
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elementIdListBottom = vtk.vtkIdList()
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for i in range(n_faces):
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# Insert the nodeIDs in the appropriate order.
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elementIdListTop.InsertNextId(i)
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elementIdListBottom.InsertNextId(i+n_faces)
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elements.InsertNextCell(elementIdListTop)
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elements.InsertNextCell(elementIdListBottom)
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# Specify that the variable 'nodes' as the points in the polydata
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pdo.SetPoints(nodes)
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# Similarly, specify that the variable 'elements' as the polys in polydata
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pdo.SetPolys(elements) |