How to extract vertex or edge on a solid?

Hi Paddy,

Can you please elaborate a bit more on "other work"? This might give us more clues to help you out.

Hi Tathagata,

I have create a solid, and I cannot continue my work unless the solid's edge and vertex can be selected. Is these has any properties or method on solid could help me select vertex and edges? Or, I have to use other feature?

Hi Paddy,

I would approach it in a couple of different ways.

Option 1:

Extract the surfaces from the Solids, using a bsplinesurface node with method extract all surfaces from solid.

You could then use a copy by geo transform to copy out a single surface by targeting it for example bsplineSurface1[0]

You could then target the polylines on the edges of this surface doing a similar thing and extract just the polyline you need.

Similar you could then extract the endpoint of one of the polylines as a point using the same method of CopyTransformGeometricContents (you can just copy from baseCS to baseCS so it just is a copy inplace).

All of that is a bit slow and takes a lot of steps.

The method I would preferred would be:

Option2:

Taking the original curve you offset from and generate a line by direction ad length from a specific point on that curve. And then for points just use a point ByDirectionAndDistanceFromOrigin

You can target the segments of the closed curve by using its control polygon

For example

curve2.ControlPolygon.LineSegments[1].EndPoint

you might just need to work around the curve to find the right segments.

That should work.

I have attached a dgn sample with the 2 options.

Thanks

Wayne

 Extract-Parts.dgn

Thanks for your timely reply!!!

Hi Wayne,

Another little question. Shown in screenshot, how to create that offset node ?

Hi Paddy,

it is an expression node that I just changed the name to offset to make it easier to identify. 
then you just type in a number. 
you could also use a slider node for the same result. 
Thanks

Wayne. 

Thank you very much.

Thank you very much.