Hi forum!

If I say draw a box or a cylinder etc, draw a line around the middle (or anywhere up or down the object), what is the most efficient way to cut one single object into two separate pieces?

Tom

Boolean for solids

Trim for surfaces

Both will use “projection” with the cutter so it doesnt need to be placed “on” the obect.

There is also an old “quick split” scripts that will quickly divide objects like that

I've no scripts installed yet, but would you be a little more specific on how best to use the boolean tool here for solids?

I've been using booleans an awful lot since buying MoI3d a few days ago.

Fantastic software MoI3d is, I'm still learning! Better than... cough... Rhino IMHO (even though Michael 'invented' that too!)

Boolean DIff ?
Right Click for Done
Click Volume not wanted
Press Key Delete (or red X) for kill line + volume not wanted in the same time!

For a cylinder take a diameter! ;)
For a complex object take a plane (or an extruded line/curve )

Fantastic! Thanks Pilou! Perfect.

Press "Keep object" if you want 2 objects! ;)

""""""""""but would you be a little more specific on how best to use the boolean tool here for solids?""""""""""

This should have the little nugget you were looking for!

A cool function can be the Native ExplodeMove after a multiple Boolean (Merge here) ! ;)

Voronoi for the perpendicular faces!




Boolean Merge the 2 perpendicular planar curves
then ExplodeMove as shortCut or Press Tab and write ExplodeMove


Of course ExplodeMove will work also with some Boolean Diff! ;)

Boolean Isect make the same but don't make the Trim between volumes themselves!

But can be useful for some real time modeling!

If Isect launched you must all redraw if you want Add or erase something on the resulted volume!
But all existing can be rotated, moved, resized!
Diff will be automatic if curves are in the same set (circle inside square = tube ) and Union Sets enabled!

Sadly, this technique doesn't always work. Or at least as a split tool, it's unreliable.

Will try Burrman's suggestion.

Have you an example file of the objects that can't be split ?

Hi tom_tm (TOMF),

Your question is: what is the most effective way to split a single object into two separate parts?

BurrMan’s answer is clear and concise.

If you click on the ‘Help’ icon in the bottom right-hand corner and then on ‘Command Reference’, you’ll see all the commands. If you scroll down, you’ll see ‘Edit’ and, below that, ‘Trim’. Click on ‘Trim’ and you’ll find a detailed answer to your question (this complements BurrMan’s clear and concise answer).

To learn how to use any software properly and understand how it works, the first step is to read the help and documentation carefully to familiarise yourself with the software, then to carry out some simple exercises.
With Moi3D, this helps you realise that almost all commands can be used in several different ways depending on the situation, the context and the type of element you wish to work on (a line, a curve, a face, a surface, joined surfaces, a solid, etc.).
Admittedly, this initial step is somewhat thankless. But, in my view, it is the only way that will eventually enable you to master the software.

I’d like to refer you to a post I created in 2023. There you’ll find links to download exercises (some very simple, others rather tricky).
http://moi3d.com/forum/index.php?webtag=MOI&msg=11109.1