topic Re: Spline in Dynamic Block in Dynamic Blocks Forum

Spline in Dynamic Block

nathanhayes98 — Tue, 28 Nov 2017 16:04:53 GMT

Hi all,

I have a spline (see attached) that we use to represent a crack. We are having to recreate the spline every time because the lengths of cracks are different. Is there a way to create a block were we could increase/decrease the length of the spline but keep its 'wavy' appearance?

Thanks in advance

Re: Spline in Dynamic Block

Libbya — Tue, 28 Nov 2017 17:52:39 GMT

How long does this spline become? Does the length need to be fine tuned to be accurate? Would a simple array of a couple arcs suffice? The end result of the following screencast might suffice.

Re: Spline in Dynamic Block

nathanhayes98 — Wed, 29 Nov 2017 08:35:19 GMT

The length of the arc doesn't have to accurate it is just for representation. What you have shown in your screenshot is exactly what I'm looking for thank you.

Re: Spline in Dynamic Block

nathanhayes98 — Wed, 29 Nov 2017 10:03:03 GMT

@Libbya

I created the block as shown in your screenshot but I encountered a problem when I extend the block, see attached screenshots. It doesn't appear to be extending the line, just making copy's of the line. I have also attached a drawing containing the block.

Re: Spline in Dynamic Block

h_s_walker — Wed, 29 Nov 2017 10:53:40 GMT

Here's your block corrected.

@Libbya was working in inches, but you were working in millimetres which is why you block wasn't working.

The start points of the arrays needed to be moved by back by 187.5 (the horizontal distance of the arc you created).

The array distances also needed to be set to 1500 (the length of your first crack).

And the minimum distance for distance1 needed to be set at 1500 and the increment set at 187.5

Re: Spline in Dynamic Block - ROTATION ERROR

Anonymous — Mon, 29 Oct 2018 20:26:57 GMT

Hi,

I created a block with a dynamic spline like how you posted. It came out great.

However,when a Rotation attribute was added to the block, the spline came out in bits and pieces while rotating.

please review the attached dwg and share your thoughts.

-Hema

Re: Spline in Dynamic Block - ROTATION ERROR

Libbya — Tue, 30 Oct 2018 16:33:15 GMT

Attached.

Re: Spline in Dynamic Block - ROTATION ERROR

Anonymous — Tue, 30 Oct 2018 16:59:12 GMT

Thanks for resolving the issue.

What was the mistake I made? I tried Polar Stretch but it did not work for me.

- Hema

Re: Spline in Dynamic Block - ROTATION ERROR

Libbya — Tue, 30 Oct 2018 18:25:35 GMT

The chained parameters all need their basepoints located at the same point as the rotation base point.