Section X Y or A B type


marking up a rhino drawing with dimensions .

How do I create a section line with arrows pointing in direction of section. and call it X Y or A B etc ?


Rhino doesn’t have a section curve object, so you could use a couple of grouped leader objects plus text or just a curve to which you add arrowheads (Arrowhead command) plus text. A-B is probably preferred for labeling, so as not to get confused with X,Y coordinates, in any case what is most often used in architectural sections.

Some info here

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Rhino should have a section command, I am quite surprised it hasnt.

  1. select start of section line
  2. text at start
  3. select end of section line
  4. text at end
  5. direction

to use same options as leader

having to try and construct a two arrowed line is a bit primitive in such a progressive program.

I used two leader arrows and didnt type anything then moved them about using control points,it took a bit of time.

Glad I only had one to do !

This must be one for the V6 wishlist unless anyone cares to do a code.


Here is something I’m working on:

It’s a work in progress. I have no idea how useful this is to architectural users, but to mechanical designers a tool like this would be useful in V6. I can’t be the only one that needs to cut sections!



Wow, great work!

Nicely done…I want that

I still need to add the breaks where the section lines jog (not shown in the video above).

I could use some opinions on this project. I added section “break” lines as shown below. Would this be acceptable to you? (you being anyone that wants to comment :smile:)



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Wow Dan, this looks great! This tool would open up the possibility of using rhino exclusively for most of my designs without having to go to another SOLID modeling program to WORK with thiS feature.

Will you be sharing the code with us???

Perhaps I’m just a laggard when it comes to drawing standards, but I’ve never noted on the section where the section break line occurs, because it is always in a featureless section of the part. Is this something you guys regularly do? Now I feel all unsettled that I’ve been doing it wrong for years (but to me it looks like it is indicating a feature I’m not seeing) :wink:


Yeah, the ability to change the line style or delete them would be nice to have.

No, not really. However, strictly speaking, I believe proper drafting standards specify a break when you use an offset or revolved section. It’s been a long time since I studied drafting in school, but my foggy memory seems to recall that. Also, there was comment in another post (where I presented a sneak peak at this project) along the lines that breaks are required.

Currently, these break lines are grouped with the section, so deleting them are as easy as a sub-object selection.


You can easily delete the break lines, or change linetypes by sub-object selection. I debated showing them as phantom lines, as I don’t like the section lines to be phantom lines and wondered if they should match. I suppose that’s the type of suggestions I was hoping to see.

As far as making it available, I wouldn’t mind a few people to beta test this for me and give me some feedback. Just be warned that I have a lot of other things on my plate, so the beta process might go on for a very long time! :wink:


I’m not sure if it complies with any particular drawing standard, but whenever I draw stepped sections, I put in a lightweight (phantom) line at the step and stagger the hatching either side of it, for each part. The hatch pattern, scale and rotation is maintained - I just offset it slightly on either side of the phantom line. That way, you know you’re still looking at the same physical component, but your eye is sensitive to the shift in the hatch so it’s easy to understand and relate to adjacent views.

Just my 2 pence/cents/yen. Nice vid by the way, Dan.

Hi Dan,

How about alternating the hatch directions?
I have no idea if this in too unconventional but maybe it’s better to read the drawings that way:


Interesting. I’ll have to think about that. Thanks for the feedback.

Can you post an example? Just a quick screen grab would suffice.

I haven’t bothered with sorting the linetype scale for the phantom lines, but you get the idea.

Sketching this also reminds me to ask if you’ve got any clever ideas to easily add thread indication?

OT: Willem - how did you attached that image, and what format is it? It seems embedded on the page!

Hi Matt,
It’s pasted from clipboard.

Greenshot is the application I use to grab part if the screen into the clipboard. In discourse I can ctrl+V and it ends up like this.

Do you ask because of the quality difference?
Probabl the clipboard holds uncompressed image data and I believe pasting will convert it to a png format. Where yours is probably jpg that has artifacts due to compression.