How do I move an object along a path?

Hello, I want to create the effect that an object is moving a long a curved path, but sometimes it will go off the curve and sometimes come back to it.

Thanks!

Replies to This Discussion

Permalink Reply by David Rutten on October 7, 2010 at 4:26am

Hi Mandy,

without seeing your ghx file I cannot tell you what's wrong. However, I think all you need is a Move (Translate) component, a starting point, a Vector2Pt, an object to move and a Point On Curve slider.

--
David Rutten
david@mcneel.com
Poprad, Slovakia

Permalink Reply by mandy lam on October 7, 2010 at 10:08am

Thanks David, very helpful. This is what I wanted. However, how do I associate the object with the moving point?

Permalink Reply by mandy lam on October 7, 2010 at 10:28am

Nvm, got the answer, thanks :)

Permalink Reply by Danny Boyes on October 7, 2010 at 10:30am

If it is an object you have created in Rhino then you can select it in GH with a BRep Param Component and connect it to the G of the Move component. Point component that goes into the A input of the Vector2Pt component should be a point on the Referenced object where you want it to be connected to the curve. If you do not wish to see the original any more then switch the preview off on that component.

Permalink Reply by Firat Aydin on February 18, 2013 at 3:13am

THANKS I HAVE BEEN DOIN THAT ONE WITH A VERY TIME AND MEMORY CONSUMING INTERPOLATIONS.

Permalink Reply by Mat Walker on March 19, 2015 at 4:21pm

Hello,

Is there a way to move a point on a curve in a similar way to your reply to Mandy but as a defined distance as opposed to a slider.

Thanks!

Mat

Permalink Reply by Mat Walker on March 19, 2015 at 4:52pm

I think I worked it out in a backwards way. I extended the original curve by negative the distance I needed and created a point from that.

Is there a nicer way of doing it?

Mat

Permalink Reply by Norm Sash on April 11, 2016 at 9:55am

I think so... just use the Curve > Analysis > Evaluate Length component. You can just specify the length (curve units or normalized units) and it will return a point on the curve that is at that length.

Permalink Reply by Solomon Siegel on April 11, 2016 at 8:16am

This was very helpful but I need to move an object at two point along a curve similar to how a train follows a variably curved track. What would I add to this to make sure the object is oriented by two points along the curve as it moves?

Permalink Reply by Norm Sash on April 11, 2016 at 9:56am

Can you elaborate? Maybe with a screenshot? It would help to explain what you are asking for.

Permalink Reply by Solomon Siegel on April 11, 2016 at 10:37am

This bean like perimeter of the closet is what I need to figure how to create a track for to allow for a surface mounted sliding curved door to run along.

I want to simulate the fixed curved door panel moving along the track on two standoff pieces of hardware to figure out how offset the sliding door would need to be in order to clear the different curvatures of the closet body.

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