If you are using the legacy system, we will be switching you over to the new system when you launch Roblox Studio after it’s removed. An informational bar (see below) will appear to notify the change. We hope you continue using the newer CSG kernel for your modeling work after this switch is made.
If you do currently rely on the old system, please be sure to report any problems with the new kernel or reasons you prefer the legacy system by replying to this thread and attach a file with a repro case.
If you don’t see the informational bar, this means you’ve already been using the new CSG system.
The geometry generated by the new system generally won’t be exactly the same as that of the old one due to numerical issues. This may result in various geometric anomalies such as micro-gaps. Please report any such findings so we can make improvements to the new kernel. With that said, the new system is much more robust and we think its upsides outweigh any backward compatibility issues.
Additionally, we are aware of the disappearing union issue and we are working on it, but it is a common problem for both CSG systems.
Please report any problems with the new CSG system below.
It was the old CSG system that studio used before they released the version 2 of it.
Studio right now uses the version 2 with the option to use the old version of it by enableding it in the settings. They will remove that setting that lets you to use the old version.
Is there a replacement for CSGv1’s negation behavior? It’d put the negated part’s color on the removed portion of the original part, which allowed for some cool effects. I’d been recommending people switch to CSGv1 if they want the effect, but that doesn’t seem to be an option anymore.
Ditto, this was really helpful for my complex stuff that I didn’t want to have to UV and model in Blender, you were able to make some cool faces and pieces with this feature. Would be really nice to see a better way to customize union colors/materials, etc.
I have mixed feelings toward this. I appreciate Roblox improving the engine, but I feel like time and time again CSG gets priority over mesh parts. CSG has always felt like a jumbled up mess of broken tools we only use if we have too, it feels so forced.
I really wish Roblox started to improve the mesh import features so I wouldn’t have to rely on CSG tools (which in my opinion can’t compete with an external modeling package). I understand Roblox is trying to create this all in one system, but devoting so many resources towards a feature that is trying to compete with entire dedicated software seems like an uphill battle, and to me, it seems that the developers who are interested in creating Roblox games in a more standard mesh focused way are left in the dust.
This, by far, will be one of the hardest updates for me to swallow.
CSG v1 has always been my go to version for modelling smooth objects (such as airplanes), as it didn’t have the sharp affect CSG v2 has. Even with the CSG v2 smoothing angle, I couldn’t get any of my unions to be as smooth, while retaining the shape I want.
I also loved having the ability to have the face of the part that was unioned to be the color of the negated part. This made it simple to add some colors, without having to add more parts/unions and hope that they didn’t corrupt.
In my experience, CSG v2 would always corrupt when I tried to model a plane. This would make me save hundreds of unions in the file, so in case one corrupted, I could try to recover it. CSG v2 never gave me a too complex/too large warning to tell me to stop, unlike CSG v1.
This is also concerning for when I would do “paint jobs” on planes, and I would union with CSG v1 to keep the plane smooth and not with any new creases. CSG v2 would always add new creases to the plane, and make it look horrible, like a crumpled up paper airplane.
Is there any way we can keep CSG v1, and use it? Possibly make a plugin that allows you to still use CSG v1? As I would not like to see this change occur. If there isn’t, I guess this update means I’ll have to learn Blender, and import all my meshes into Roblox now, since CSG v1 is getting removed.
What I struggle to understand is why Roblox is still investing in CSG. The tools are lacklustre and cannot be compared to better solutions like Blender. At any moment your unions could just magically disappear without a trace (the fact that someone had to write this post proves why I will never touch CSG).
The time you spend trying to cobble primitives together with CSG (which half the time errors when you try to use it) on a project could have you become proficient enough in Blender that you are already pumping out far better quality models than any user of CSG can ever dream of. Using Blender gives you security in that your models won’t magically vanish, gives you far more control, and your skills in it can be applied outside Roblox and used in the future.
Instead of Roblox trying to reinvent the wheel (like usual) and compete with leading tools, why not create better integration for those tools? Maybe provide better documentation and tutorials on how you use them so that even new developers can easily grasp it.