Removing a portion of or splitting a part

[HungryFox02 (Hungry)]

Hello! I’m going to give a quick rundown of what I’m trying to do. I am trying to cut a part into multiple parts to remove a portion of that part, I need them to be completely seperate parts, so unions aren’t an option for my use case. If this seems confusing, please refer to the images below;

I’ve been attempting to do this on my own, but to no avail, any help would be greatly appriciated!

[blokav]

This might be useful:

Solid Modeling | Documentation - Roblox Creator Hub

[HungryFox02 (Hungry)]

Sorry, I should’ve mentioned in the op that I need them to be completely seperate, unions aren’t an option for me.
EDIT: Added to the op.

[HungryFox02 (Hungry)]

Update: I’ve improved my function to split parts, but its not quite working correctly, sometimes parts will be spaced out or inside of each other, keep in mind this isn’t the removal part, i’d imagine i’d use this function multiple times to do what i mentioned above.

function Split(part,p,axis) -- "p" is how far along the axis to split.
	local partC = part:Clone()
	local op = part.Position
	
	local s1 = part.Size
	local s2 = partC.Size
	print(s1,s2)
	s1 = s1 - (((s1*(Vector3.FromAxis(axis)))/2)+(((Vector3.FromAxis(axis)))*p))
	s2 = s2 - (((s2*(Vector3.FromAxis(axis)))/2)+(((Vector3.FromAxis(axis)))*-p))
	print(s1,s2)
	
	local p1,p2 = part.Position,partC.Position
	
	--p1 = p1 - (p1*(Vector3.FromAxis(axis)))/2
	--p2 = p2 - (p2*(Vector3.FromAxis(axis)))/2
	
	p1 = p1 + (Vector3.FromAxis(axis)*p)/2 + Vector3.FromAxis(axis)*(s1[axis.Name]/2)
	p2 = p1 - Vector3.FromAxis(axis)*s2[axis.Name]
	
	part.Size = absVector(s1)
	partC.Size = absVector(s2)
	part.Position = p1
	partC.Position = p2
	partC.Parent = workspace
	partC.Name = "Part 2" -- used for testing
end

[blokav]

@HungryFox02

I need them to be completely seperate,

This was done with SubtractAsync:

[HungryFox02 (Hungry)]

As mentioned before, unions will not work for my use case

I need them to be parts that can be later merged with other parts (not unioned, but instead the parts are resized and repositioned to make it look like they’re 2 different parts when in reality its one part), furthermore I need it to be at least semi-efficient, this will not work.

[Apafey]

@HungryFox02

I need them to be completely seperate

Hi, I was thinking on this question.
As I see in the attached picture,

1. the parts are not completely separate, the 3x1 part on the left could be splitted into 3 parts (1x1 size)
2. there are more options to split parts, e.g. 2 pieces of 2x1 and one 1x1 could be an option.
3. what if a 3rd dimension (y) comes, like you remove 1x1x1 from a 3x2x2 part?

What I would consider:

1. do you really need the big part? why don’t you use small (1x1x1) blocks from the start?
2. if there are limited number of possible “big” parts (from which you remove a smaller one), you may use predefined set of parts that will easily replace the original one.

[HungryFox02 (Hungry)]

@Apafey

do you really need the big part? why don’t you use small (1x1x1) blocks from the start?

The big part is needed so i don’t have literal millions of parts in the game, it’s the reason for the part merging script i mentioned in an earlier post in the first place,

@Apafey

if there is a limed number of possible “big” parts (from which you remove a smaller one), you may use predefined set of parts that will easily replace the original one.

This is meant for a game that involves players modifying “terrain”, and as such a solution such as this isn’t viable.

[Apafey]

"…game that involves players modifying “terrain”

Ok, clear, I hope someone will tell you the trick.
I worked on a similar “minecraft-like” engine, I faced similar questions.

You could fill locally the targeted big part (on mouse hover) with 1x1x1 blocks (invisible, not cancollide), so when you hit with mouse, you will exactly know which one to be removed. Then you can destroy the big part and replace it with the remaining small ones on the server.

But anyway, your world becomes more and more complex as the players destroy big parts and replace them with smaller ones.

[Jaycbee05 (Jaycbee)]

Here’s a very good thread/post if you havent read it already:

Part to parts breaker to fit window,door

So I actually had @alertcoderf ask a similar question not too long ago so I luckily have some code just for this. I don’t claim it’s the most efficient approach since it doesn’t attempt to group like parts, etc, but it works. Keep in mind, much like your videos the code only works with parts that are relatively axis aligned. In essence the idea is to first have a function that can slice a part on any of it’s given axes. [2019-08-31_11-33-02] Once you have that down cutting out a window is …

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The link of above uses a method that splits a part on all axises but it’s a little “limited” and doesn’t quite allow for complex cut outs so you’ll probably need to utilize wedges/triangles. In other words you have to do some more splitting

Slice a Block like a lightsaber

CAUTION: Math and Trigonometric Manipulation content up ahead, turn back now before it’s too late. Have no fear, for I think I have found what you’ve been looking for: [image] [image] [image] EgoMoose had a challenge on ScriptingHelpers that allowed people to find methods and ways to accomplish what he did in those gifs, Snack Break Problem #28 - Scripting Helpers Luckily for us he provided the solution/source code, so you can take a look at it and see how you can implement it with your Li…

[HungryFox02 (Hungry)]

@Jaycbee05

Here’s a very good thread/post if you havent read it already:

Part to parts breaker to fit window,door Scripting Support

So I actually had @alertcoderf ask a similar question not too long ago so I luckily have some code just for this. I don’t claim it’s the most efficient approach since it doesn’t attempt to group like parts, etc, but it works. Keep in mind, much like your videos the code only works with parts that are relatively axis aligned. In essence the idea is to first have a function that can slice a part on any of it’s given axes. [2019-08-31_11-33-02] Once you have that down cutting out a window is …

This is EXACTLY what I needed! thank you so much!