I wonder if I missed this in the built-in tutorials, but I did not see how to modify existing curves, so instead I found this video:
However, when I try for myself, by adding an arc parameter and a line parameter, both of those, when I select the “set one arc” or “set one line” menu options seem to want me to create a new line or arc, but I already have them correctly placed in my 3D file!
What am I missing? How can I get these parameters to accept my already created objects?
For already drawn curves use the curve or geometry parameters.
as far as i know, there are two types of line in grasshopper. One of them is located in Geometry tab and by setting a line, it wants you two draw a line in rhino.
the other Line component is located in Curve section under Primitive. it needs two points two draw a line between them.
in order to set a line or arc or any kind of curve into grasshopper from rhino, you should use Curve component.
Thank you, both of you are correct.
From a user perspective, this should really be highlighted in the interface, and currently it looks as if all paramters should be able to come from Rhino.