Hello,

I was wondering if someone might be able to comment on ‘proper’ use or limits of the osnap tangent option.

To keep this post brief on why I want to use the tangent option as in my attached file I’ve simply done a simple version just for illustrative purposes. Because in the file I’m including there are many other options to get the intended result.

In this file I’ve drawn a curve in Top view with cplane set to World Top.

After which I’ve drawn a vertical line not connected to the curve.

Setting osnap options to near and tangent my hope is that I will get the point ( any point along the vertical line actually ) to snap to part of the curve that is tangent to that vertical line.( keeping that line vertical in the process ).

By observation and knowing how I construction the curve I know where the position of the tangent should be but the osnap tangent most of the time doesn’t give me the results expected.

In my file I’ve left the vertical line at the most recent point where Rhino indicated where the tangent point is. Clearly it isn’t.

To add to the strangeness if I move the vertical line off the curve someplace else in the view and deselect - Then reselect and try again, Rhino will give me a different ‘tangent’ position along the curve than what it did before.

Comments that help me understand this is appreciated - Thank You

Tangent to a curve.3dm (24.7 KB)