line perpendicular to a curve

Replies to This Discussion

Permalink Reply by Daniel Piker on December 8, 2009 at 2:13pm

The line from a point to the closest point on the curve will be perpendicular to the curve. Are you getting lines which are not perpendicular? If so then something is going wrong. Perhaps you can post an image or definition.

Permalink Reply by Manuel on December 8, 2009 at 7:45pm

As Daniel said, you can use the crv closest point to create a perpendicular line:

or maybe your set of points are on the curve?, then you can use a horizontal or a vertical frame like this:

Permalink Reply by Alex Fernandez on December 9, 2009 at 5:59am

Thanks for your answers. What you say works in 2d but not in 3d. In 2d the closest point to a curve is perpendicular to it and is the same curve that is produced in the Y axis of the curve frames. You can see highlighted one on top of the other.

But in 3d the closest point to a curve is not perpendicular to it.

Any ideas if you have a set of points how to find the perpendicular lines from the points to the curve?
Thanks.

Permalink Reply by Daniel Piker on December 9, 2009 at 6:12am

The line from a point to the closest point on the curve will be perpendicular to that curve whether it is a planar or a space curve.

Remember there are an infinite number of perpendicular lines to a curve at a particular point (all lying on the plane normal to the tangent of the curve at that point).

Permalink Reply by Manuel on December 9, 2009 at 9:24am

Also.. there is a vertical frame component if you need vertical lines.

Or you can move your points to a vertical plane.

Permalink Reply by Despina A on April 23, 2013 at 1:21am

Hello there,

I have a similar issue and i need your help if it is possible.

I need to have perpendicular lines and also vertical from curve's points.

The length of each line it needs to be the distance between curve point and a horizontal plane.

Could you please help me?

Thanx in advance D.A.

Attachments:

• 1.jpg, 115 KB

Permalink Reply by Marek Krzyzowski on February 7, 2010 at 8:24am

I had the same problem. I did that as folow

Permalink Reply by Marek Krzyzowski on February 7, 2010 at 9:33am

Other way. This produce the same effect.

Permalink Reply by Jon on March 19, 2013 at 10:37am

dear all,

with newest G.H. seems something wrong with Hframe.

when i take the parameter values at division point as input for component HFrame, it generative 685 frames inetead of the number of division.

 

 

 

so has anyone any idea what could be the problem?

 

 

 

Attachments:

• base-curve.3dm, 101 KB
• perpendicular.gh, 4 KB

Permalink Reply by Nick on March 19, 2013 at 11:09am

reparametrize your curve at the C input of HFrames.  (right click on C input)

I think... I don't have rhino/GH on this comp.

Permalink Reply by Rémy Maurcot on March 19, 2013 at 11:12am

franck,

The N parameter expects an integer.
The parameter t he accepts any number.

A parameter t can be connected to a number ....

Warning HFrame gives plans strictly horizontal ...

Permalink Reply by Hannes Löschke on March 19, 2013 at 11:55am

There are two components:

HFrame, which expects t parameters and creates frames at t places you provide

HFrames, which expects an integer N and places N frames ar constant intervals along the curve.

...you just picked the wrong component.