Did you check the Collision Fidelity property of the union? Make sure it is set to Default for the better results.
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No, I never seen it. Where do I see it?
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Select the union and have the properties window open, scroll down until you find the property named Collision Fidelity. See if setting it to Default fixes the problem.
Also there’s more information on it in the Hub.
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Ok, I’ll try it later.
Thank you.
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Unions are tricky and to get more accurate unions, use more parts to make the union.
You can enable Decomposition Geometry in Settings: (Recommend this plugin so you don’t have to reload studio every time.)
This enables you to see the collision areas and to get your unions more accurate. The colored areas are the object’s hitbox. So if you have the can collide for this object turned on, the places that are colored, you can’t go through. For example this looks like you can go through:
But really, the area is smaller.
Hope that helps!
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Probably it helps, thank you for the plugin. 
The plugin is very good, thank you.
I gave you a like, It’s great idea.
Using more parts ≠ more accurate unions.
The collision detail is based solely on the complexity of the union and it’s size. So by using more parts, you will most likely make it worse.
Yep, worse. Wasting time and hard working. xD
I don’t mind for it, I like to develop things lol.
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Screenshot by Lightshot Dada! I had unioned more parts then that’s why the spinning door couldn’t spin.
Screenshot by Lightshot It was when were together union with many parts. Now it should work properly.
Screenshot by Lightshot That curve union is good now, but spinning door doesn’t work, I need to disable parts collision but I don’t want to. I want it to spin properly, how do I do that?
Use Collision Groups to disable Door-Wall collisions.
Enable Collision Group Editor on the Model tab on the Ribbon bar, create a new group, assign the door and the wall to it, and make it so that all stuff inside that group don’t collide with each other.
Or you can use the new NoCollisionConstraint, to connect both the door and the wall to disable collisions to each other.
That’s just an ID of the group. You need to open Collision Group Editor, as I instructed above, to create a new group.
Just press the union and go to the properties section.
Checking the box will not let players through, while un-checking it will.
Create a NoCollisionConstraint through the Constraints section on the Model tab of the Ribbon bar. If you have nothing selected, once you click it, the next two parts clicked on will be connected with that constraint.
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May you make a video? I’m not good enough, I had broke game already, etc. xD
Baseplate, fall through lol. Well, by doors spinning properly must work without players going through unions on cancollide off.
I can’t make a video.
Every part’s CanCollide property is supposed to be enabled.
Only the door is supposed to be unanchored, but (I assume) it’s meant to be connected via a HingeConstraint, so it both doesn’t fall, and rotates around.
Then make sure all parts of the door are connected with a NoCollisionConstraint.
This is how you can connect parts with it:
Once you do that, you should be able to rotate the door freely and be able to walk through it, spinning it out of the way.
If you have any issue while doing so, make sure to describe it in full detail, so I’m able to guide you through to solve it.