TAGGED: centerlines, geometry-import-txt, scdm
April 11, 2023 at 9:53 am
April 11, 2023 at 11:06 ampeteroznewmanSubscriber
I don't know of a way to deform a stent in SpaceClaim to so that a straight centerline deforms to the green curve.
I do know that after the stent is meshed and there are nodes that have coordinates, it is possible to deform the nodal coordinates to the green curve.
April 11, 2023 at 11:14 amAyeon HwangSubscriber
Thank you for your answer
Could you explain the way you know?
April 12, 2023 at 12:04 pmpeteroznewmanSubscriber
This a simple example, which is to take a straight stent and “bend” it into a circular arc in the XZ plane. The X axis is horizontal along the axis of the stent, and Z is vertical. Note that X=0, Z=0 at the center of the stent.
In the ds.dat file are all the XYZ coordinates for every node in the mesh. Bring them into a spreadsheet.
I used an equation of a circle of a given radius, tangent to the origin. Given an X coordinate, the equation computes the Z coordinate of the circle. This is called the Sag equation in Optics. I simply used that equation to add an offset to every nodal Z coordinate using that node’s X coordinate. Copy/Paste the new XYZ coodinates back into the ds.dat file and you have a curved stent.
Note that this lateral shift is not a true “bending” of the stent, it is actually a shearing of the shape, but for small values of the Z offset, it is close enough and is really simple. A more precise transformation would have computed the rotation of the cross-section, but that would be more complicated.
For your case of a general 3D spline, you could extend my simple lateral shearing, but in two directions: Y and Z for each axial coordinate X.
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