Evaluate point on Curve with distance?

Hi, all,

How can I evaluate points on curve with distance value starting from middle point?

pt.DivideEquidistant(double dist);

Above curve method evaluates point from start point.... is there way to normalize curve domain '-1 to 1' to get 0 domain value at middle point?

or is there more simpler way to do it?

Replies to This Discussion

Permalink Reply by YJ on February 25, 2011 at 3:09am

I used 'SetStartPoint(0.5)', then it works now.

Permalink Reply by David Rutten on February 25, 2011 at 5:37am

Hi YJ,

no, there's no overload to get a point along a curve length, starting at a given length. Here's two ways to approach this:

1) Trim the curve so you're only left with the portion you want to measure. This involves actually changing the curve, so it's fairly hefty solution.

2) If you want to find the point 2 unit beyond the middle of the curve, just measure the entire length (L) and then measure the PointAtLength using (0.5*L + 2.0)

David Rutten

david@mcneel.com

Poprad, Slovakia

Permalink Reply by TheChosenOne on February 25, 2011 at 7:30am

Permalink Reply by Danny Boyes on February 25, 2011 at 7:56am

2) If you want to find the point 2 units beyond the middle of the curve, just measure the entire length (L) and then measure the PointAtLength using (0.5*L + 2.0)

Permalink Reply by TheChosenOne on February 25, 2011 at 8:57am

Permalink Reply by David Rutten on February 25, 2011 at 9:17am

Permalink Reply by Danny Boyes on February 25, 2011 at 9:20am

The point you are evaluating is 2 units beyond the middle i.e. Halfway + 2. Not the middle. This was an example of how to get a point on a curve when using the middle as a starting reference.

Permalink Reply by TheChosenOne on February 25, 2011 at 10:20am

"...If you want to find the point 2 unit beyond the middle of the curve..."

I understand. Excuse me for my inattention ...

Interesting way, I do not know.

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