Box on Curve

Replies to This Discussion

Permalink Reply by Danny Boyes on March 21, 2011 at 12:16pm

When you measure the angle between vectors you always get the acute angle with no indication of direction. But if you use the cross product component of the two vectors you will get the direction of the normal (rotation access) and therefore you can get an indication as to which direction you need to rotate. I unitize the cross product and multiply the angle by the Z component.

Permalink Reply by Hannes Meraner on March 21, 2011 at 12:52pm

Thx Danny for your reply.

I think that this is not the solution of my problem. Now I post my ghx file.

so you can have a look.

 

thx

Permalink Reply by Danny Boyes on March 21, 2011 at 1:12pm

With the Cross Product:

Without:

This is the method I use on a daily basis with plotting ship tracks, where Y is North and the angle to rotate is the heading.

Permalink Reply by Hannes Meraner on March 21, 2011 at 3:26pm

Thx a lot Danny. Now it works perfect.

Permalink Reply by Joe S. on March 21, 2011 at 4:36pm

While the vector method gives way more control I think you can do the same thing with frames.
(majority of the definition is for the curve).

Attachments:

• help4.ghx, 196 KB