Vector Projection error

Hi David,

Projection of a vector onto a plane does not seem to be working correctly in some cases - see attached file. The result of the vector projection is not in the plane which it is being projected onto. It seems to work correctly when I create the plane / vector inside GH - not sure why.

Cheers,

Luke

Attachments:

Vector Projection issue.gh, 7 KB

Replies to This Discussion

Permalink Reply by Danny Boyes on July 13, 2012 at 7:28am

The Project Component is basically flattening the object on to your chosen plane in the direction of the Normal of the Plane. The Vector you are projecting is being converted into a point before flattening.

If you want to intersect the plane along the line of the vector you could use the line|plane intersection component

Permalink Reply by Lucas Epp on July 13, 2012 at 7:37am

Thanks Danny - yes, that's what I saw was happening, and so I projected a line instead of a vector and then converted that line into a vector to get what I needed.

I guess what I was getting at is that if the project command works as per its literal interpretation it should be returning a vector in the plane, with length equal to the scalar projection of the vector onto the plane. Anyway, very easy to do using lines instead - just thought I'd point it out.

Cheers

Permalink Reply by Danny Boyes on July 13, 2012 at 7:44am

I don't think the Vector is being treated as a valid type to be projected. That's why its being converted to a point.

Permalink Reply by David Rutten on July 13, 2012 at 9:00am

Indeed, a Vector is not technically a piece of geometry, and the Project component only operates on geometry. Maybe I should let it operate on all data types, special case vectors and then display an error if the provided data is neither a vector nor geometry.

David Rutten

david@mcneel.com

Poprad, Slovakia

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