Cannot cut part of a closed curve

[macotes]

Ok. What I really cannot do is cutting the part of a closed curve above the z=0 plane. The general question here is: Is it possible to cut somehow a part of a closed curve wherever?

Thanks.

Continuing the discussion from Snapping to a CPlane View:

@naturallyjo

Hi, I am trying to make a line in a CPlane Viewport with the Project and Planar options on. The line snaps to a certain elevation, and NOT what I actually want to snap to on an object, or even along that plane. (Please refer to the screen shot below.)

I would greatly appreciate some advice on whether this is bug or if there is a solution to this issue.

Thank you.

<img src=“https://global.discourse-cdn.com/mcneel/uploads/default/original/3X/6/d/6df93f8d19778104545247b91e98e281a5de51cb.jpg” width=“641” height=“500”>

Continuing the discussion from Editing solids and planes:

@hcueva

Hi

I am converting a meshed model to surfaces and polisurfaces. To do so I used the mesh to nurb command and then the merge surfaces command.

I still have some irregular surfaces (diagonal) that I am exploding , deleting and creating the surface again. is there a way to join them and delete the diagonal line that joins the surface? Also hoy can I ad points and surfaces to an existing surface?

Thanks

Continuing the discussion from Cannot cut part of an open surface:

@macotes

Hi.

I need to “cut” the part of an open surface above the z=0 plane. I am trying but I don’t know how to do it. Any suggestion will be greatly appreciated.

Thanks in advance.
<img src=“https://global.discourse-cdn.com/mcneel/uploads/default/original/3X/6/d/6daa9db27622253a46574e7bc33fb32c777b4eb9.jpg” width=“690” height=“349”>

[jeff_hammond]

@macotes

Ok. What I really cannot do is cutting the part of a closed curve above the z=0 plane. The general question here is: Is it possible to cut somehow a part of a closed curve wherever?

hmm… yeah, you can cut anything anywhere…
maybe a sample file or picture of what, exactly, you’re trying to do would help.

[macotes]

As simple as this. I want to cut several closed curves like this one, from z=0 upwards. I can use the Trim command with surfaces, but I don’t know how to handle these closed curves.

[pascal (Pascal Golay)]

Hi Miguel- in front or right, start Line, type in 0 as the start point, set BothSides and then use Ortho to set the line exactly horizontal in that view. Use this line to Trim the rectangle, making sure that ApparentIntersections=Yes as a rule.

Any luck?

-Pascal

[macotes]

Hi, Pascal. Very good. I have a lot of these closed curves. Thinking of a general method.

Thanks so much.

[pascal (Pascal Golay)]

If you have a lot of curves and they all need to be trimmed at the same time to the same line, use a crossing window to select the sides of all the curves to trim off at one time. Does that get at what you need? See also the CutPlane command for making a trimming plane- Select all curves, start CutPlane in an elevation view and use Ortho to keep the plane horizontal to the view. A plane cutting through all selected objects will be created.

(BTW, in V6, you will be able to trim/split with the current cplane.)

-Pascal