I need to divide a few simple objects consisted of planes (but inclined, and of various outlines), on the Z axis, which means that the face divisions should be parallel to the horizontal axis, is this possible?
Thanks, I did just that, before asking here, and it didnāt work well.
The boolean modifier is buggy and instead of cutting it properly, it created surfaces behind it and messed everything else.
It took me hours of tedious work to manually cut the surfaces using the knife and the planes only as a visual guide! One simple thing that could be a few clicks and 1 minute, took me hoursā¦ which is the norm with Blender.
I asked here, because Iāll need to repeat this for several other objects soon.
P.S. If it works with the monkey, itās because the boolean modifier works better on closed shapes.
Mine, werenāt closed.
Yes, you would have to give your planes some thickness.
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Problem is that if the mesh isnāt closed the algorithm will have a hard time to know what is inside and outside , therefore the cuts will be brokenā¦
There are some techniques involving geometry nodes but they are likely to be less precise and are bound to the same issue.
Lol, of course ! Why not end up your sufferings and try other software then ?
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Thanks, that did it. I gave the multiple plane a thickness of a tenth of a millimeter, it cut the object properly, and then I used Mesh ā Clean_Up ā Merge by Distance and set a higher value and it joined all those narrow double cuts.
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It doesnāt have to only think in terms of āinsideā and āousideā, there should also be ācutā.
You shouldnāt discourage feedback for a software that suffers from hundreds of thousands of bugs, and other limitations.
one thing to keep in your pocketā¦ every once in awhile youāll still get weirdness when you boolean out like that, even with your cutting planes having thickness. i do it in geometry nodes, the bool operation, that way i can afterwards select all the faces with the cutting planes material, and delete thoseā¦ removes all the goofy wrong faces in one go, leaving behind a ācleanā boolean. (clean in blenderās algorithm idea, anyway. 
)
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Interesting, I did some search and found videos about that,
thanks!
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A bit lateā¦ ( already marked as solved ) but maybeā¦ with orginal text:
Laser slicer add-on for Blender 3.1.
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Thatās a bit different, it creates a number of infinitesimal slices of the object (sections), while Iām interested in just dividing the object like the knife tool does, (not removing parts of it), but itās good to have such a tool, Iām sure it will be handy for other purposes, thanks!
Ahh yesā¦ i seeā¦ a slightly different meaning slicing, cutting, dividing, partitioningā¦ 
What algorithm this is based on ? Can you demonstrate the functionality youāre describing in another software ? Is there an actual paper that describe how to implement that functionality ?
In general, if something is obvious and not there itās either that itās going to be there, or itās not possible, or too difficult to do. Ideas are the easy part at and developers/users have a lot of them, implementing them is what takes times and is complex.
Well, first you are not in the right place for feedback since developers barely read this forum.
Your best shot is Right Click Select to make a proposal on a feature request or improvement.
While everyone feedback is interesting and worth listening, Iām wondering how much knowledge you have in 3D in general, and therefore how useful that feedback might be.
Many hobbyist can take blender and use it , but at the end of the day itās a professional software tied to a craft that needs a lot of years of studies to get right.
You might look at sketchup that is simpler and more user friendly, and then you import your models to blender for rigging and animationā¦
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[ OFF-TOPIC ]
You catch a few words, and start an off-topic discussionā¦
Itās simply dividing faces that intersect a given plane, itās not rocket science, itās simple 3D coordinate geometry, the most common function, algorithms based on that are known for many decades, and are used all the time, even Blender uses one with knife and in several other cases, itās just the specific implementation that is missing.
There is short, spontaneous feedback, and there is organized feedback, especially about bugs and limitations. The latter requires a lot of time and effort to find a way to reproduce each bug you stumble on, and then submit a bug report properly, itās a significant part of debugging, and I donāt have the time to debug Blender, nor am I paid via donations, courses, and other ways like most of developers - Iām busy trying to find workarounds to bugs, in order to complete my work, and debug my own code.
Also, if that site worked, the bugs would have become fewer, but we see the same bugs for decades, as itās easier and more rewarding to add features, than debugging the code.
You contradict yourself, is everyoneās feedback worth listening, or not?
I have enough knowledge to recognize every single bug and limitation I encounter and how feasible it is to correct or prevent it, unlike you, who also makes excuses for everything, and actually does more harm than good.
Feedback is change, excuses is maintenance.
Yeah, letās pretend that itās hard due to the difficulty of the craft, LOL
Iām not a hobbyist, and I expect from a āprofessionalā software to first and foremost correct its chronic bugs. Iād trade all new features for the next 3 years, with fully debugging and polishing Blender instead.
At itās current state itās anything but professionally made, itās just an app that some professionals of the industry find attractive for some use-cases and use it, or became professionals after struggling for 10-15 years as amateurs finding workarounds - thatās a big difference.
If it didnāt suffer from so many bugs and some really bad usability issues that dramatically reduce efficiency, it would be 100 times more widespread, and many more professionals would use it. That is something that Blender devs who benefit from Blender donāt seem to understand.
Thatās a good one, LOL.
Sketchbook is 1) mostly made for architecture, 2) itās online, and 3) it doesnāt worth its price, 3 NOās for me, and one for you: no thanks! 
If you have found so many problems with Blender, why use it? Thereās surely better options for your workflow out there that youāll be happier with
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One of` Blenders major re-write was done by 2 people who were working at Maya at the time.
And do define professional. A half-a$$ed addon for any app is āprofessionallyā written if one person purchases it.
You seem to be denying that movie studios hire programmers to make customizationās. What you call workarounds. So the working professionals need professionals to fix the usability issues and bugs they encounter.
Name a professional that works with zero add-ons, plugins etc in whatever 3D software they use.
Then extrude them so they are closedā¦ Simple.
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If itās constructive itās worth listening, but not always useful. A child might have ideas about how to solve worldās issue, and itās charming but itās not useful !
If thatās really the case you should be able to find other solutions to your problems.
Every software especially in 3D is bugged and limited because of their complexity. Itās part of the job to find your way to the result you want. If itās impossible, itās either that you are using the wrong software , or you are not using them the way itās intended.
Again, complaining about what Blender canāt do, is just a waste of energy for everyone. You gave a great deal of āfeedbackā on various posts, did that lead to improvements in blender ? Did any developers contacted you ?
Submitting bugs or feature requests takes a lot of time but itās our responsibility as blender users. You probably donāt pay for it, the least you can do is to make a report once in a while, thatās how things get eventually fixed. Itās hard to find time for that in a working day, I agree but submitting a few bugs here and there do make a difference, we are blenderās beta testers.
Iām having a hard time to understand what makes you stick to blender. If you donāt have the money to buy another software accept that itās not the perfect tool for you and try to find your way around, like we all do.
But if you are a professional, meaning this is tied to a business you might consider how much money you loose each mounts by using the wrong tool. Since the time wasted delay the release of your project and therefore impact quality.
Iām part of the āprofessionals of the industry that find blender attractive for some use-cases and use it,ā and it seems pretty solid for what Iām doing with it. Itās never perfect either but Iāve done countless projects with it, clients are happy and stuff is delivered on schedule. Thatās why itās really difficult for me to believe itās that inefficient for your use case.
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On the one hand, I donāt really want to keep complaining about the software, especially in irrelevant threads, no matter how many hours I might have wasted instead of the expected 1-5 minutes or so, or the fact I even got gluten intolerance many years ago due to the continuous, excessive stress from struggling to implement a project in Blender for 45 days non-stop, with little sleep, frustration to the maximum, battling all-day long with an insane number of bugs and shortcomings to meet a deadline
(stress is considered one of the possible causes to become gluten intollerant according to studies, and prospects were people that had serious car accidents as mentioned in such studiesā¦)
ā¦which is why Iāll stop whining (āhurray!ā).
Thatās not a threat, itās a promise! 
On the other hand, turning a few words to a long, extensive, off-topic discussion takes at least two, and those few words of frustration had every time the amazing power to leverage the response of a whole crowd more or lessā¦
Also, I donāt have the time to properly respond back. You specifically, have made a lot of incredible reasoning mistakes especially on the other threads, obviously due to lacking a deeper knowledge about things like software.
I had almost fully written demolishing responses, but I didnāt post them, as I had to choose between working, and trying to tutor or mentor people fanatic with Blenderā¦
I understand the love with Blender, I also love tools that have helped me, even more feed me, including Blender, but that doesnāt affect my judgment. The curse, is to know how something could be made better, which inevitably leads to frustrationā¦
I also had the idea to draw a few specific images to explain exactly my view with very few words, and resolve all misunderstandings at once - no time for that either.
So this post will be my last response here, and about complaining in general, but Iāll open a new thread to make a proposition about how Blender can follow a revolutionary evolution path that can turn it to the highest quality, and most competitive 3D software in the industry.
See the link at the end of this post.
Iām talking about quality criteria, youāre talking about marketability criteria.
Intuitive, flexible, and efficient.
Everything else is implied from these 3 criteria:
if itās intuitive, it will have a logical interface structure, and a consistent methodology, so it will be easy and quick to learn, and use.
(An artist wonāt have to spend many years to fully adapt to the flaws of the software. It wonāt even require to RTFM, or ask a human for help - the only way to resolve issues today).
if itās flexible, it will adapt to the userās needs, but it wonāt require low-level manual guidance, because it will be efficient.
also, if itās efficient and flexible, it wonāt suffer from a ton of bugs and other unjustified limitations. Working with the software will be straighforward, and problem-free.
Iām not denying any of this. Quite the contrary, Iām saying that this shouldnāt happen at all.
In fact, you just verified my point that most software including āprofessionalā sucks big time, and there are no excuses about that.
Itās a disease of our primitive and decadent era, that needs to be cured.
We shouldnāt adapt to this, we should fix it.
And there is only ONE way:
This is not just arrogant, but hilariously wrong. If you took just a few minutes to learn more about sozap, you would be begging them to teach and mentor you everything they know
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If I understood correctly, instead of booleans, I would just have knife project an array of segments, then selected the projected edges, V to split, then in object mode, separate by loose parts.
Few seconds, all in Blender vanillaā¦
Just to sayā¦