Is it possible to fix union collisions without plugins?

[ContentN00b (Content)]

I’m trying to use unions to make a hole in the wall that a player can walk though.
The issue is that the collisions are wonky and that I don’t really want to use plugins either.
I’ve tried using WITHOUT unions, but I don’t like having that many parts in one place.
If you can help me, please reply below. Thank you in advance.

[mothmage (moth)]

Generally it’s fine to have a sizeable amount of (anchored) parts as long as they’re not semitransparent if performance is your concern and is what I’d do in your situation, unless you need it to be a union for in-game CSG use. You could try splitting things up into separate unions if that’s the case, though it’s hard to determine what would be best without an image reference.

[ContentN00b (Content)]

Thank you for the advice, I’ll try it out when I get to it.

[Veldaren]

MeshPart Collision problems

Edit: To add onto that, IIRC, the collision detail is measured as a percentage of a CSG/Meshpart’s complexity, meaning that the more complex a shape is, the less “focus” is applied to collisions and is instead spread across the whole shape. So even splitting a mesh at a random spot (not necessarly at a concave area) for smaller, less complex chunks will allow ACD to focus on fewer triangles and create better collisions.

(Make sure you view the whole post, the embed doesn’t show everything :P)

[KrimsonWoIf]

Hello, @ContentN00b. I see you are having issues with making holes players can walk through. While many see this as roblox’s engines faults, this is not entirely accurate. The default setting on unions has rough estimates for collision boxes to save preformance. You can change this setting to be more precise, removing invisible collisions on unions

Change:

1. RenderFidelity to Precise
2. CollisionFidelity to PreciseConvexDecomposition

These changes will remove issues with collision boxes since roblox will compute the collision boxes with more detail.