Problem with unions (dead space)

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#1

Hello,

I have had a problem with my unions having dead space in the corners and on openings. I have attached a video, but it doesn’t really show the problem very well.
I want to know how I can fix this as I have a doorway that I cannot get into due to unions and it blocks off the corners of big rooms.

Union Problem.wmv (5.1 MB)

Thanks!

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#2

Im not seeing much dead space here to be a real issue, but you can always improve the collision fidelity by changing the CollisionFidelity to something more precise like PreciseConvexDecomposition under properties.

Also there is a setting for Decomposition Geometry in studio settings that once ticked on, will show you how your unions look like from a collision point of view.

Hope this helps.

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#3

There’s many posts about this topic from before. Try using “Unions don’t let me walk through doors” in the search bar.

Basically if you cut a small door out of a large Union there’s a percentage issue. If you Negate a 6x8 stud doorway in a 400x40 Part it may not even have a physical opening, but it will be rendered with a hole.

Try using this plugin Mesh Optimization Tools - Roblox by CloneTrooper1019. It’s an awesome tool that shows you what a Union or MeshPart looks like physically instead of visually. You can also change a checkbox in your File>Studio Settings>Studio>Visualization>Show Decomposition Geometry but that checkbox doesn’t allow you to toggle back and forth between the 2 versions easily because you also have to change a Property (like transparency, or color, or reflectance for it to actually work.
There are also Properties like CollisionFidelity in your Union. If you change it to PreciseConvexDecomposition the physical rendering will be more like the visual rendering.

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