Single Sided Mesh Parts, Best Practices?

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#1

I want to know if making single sided meshes are part of best practices or do more harm. Below is a plate mesh ripped straight from Blender and another complex-faced mesh (front and back shots with Decomp Geo on the right). Obviously nothing shows from the back of both meshes, though collisions still work.
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I’ve had an isolated case where a TeamCreate slot crashed due to (what I thought to be) too many of these single sided meshes, and resizing is a little weird, but does anyone else have experience with these? Is it best practices too?

Cheers.

2 Likes
#2

Most games use singles sided mesh from what I know. Usually when you glitch out of the map you can see through it since there are no faces on some sides of the mesh. Also, less faces = less to render. (I know nothing about this I’m just making a guess based on what I’ve seen in the past)

#3

Oh you’re definitely right, I knew this back when I would fool around on the Morrowind Construction Set for PC back in like 2005 (I’m old, I know). But I also know that Roblox is a fickle mistress, and not everything is as it seems.

I’d definitely like to have all my meshes from this point on only show the rendered sides, I just don’t know if that causes any crashes like I’ve had thought to come from it before.

#4

Triangles have a direction. Without getting too technical, in a mesh’s triangle data it stores an array of indices to define the mesh’s triangles. The order these vertex indices are listed in define which way the triangle will render (typically counter-clockwise iirc but may vary per implementation).

#5

So does it help or hinder to have a single side? Or does it not even matter?

I’m also curious about how collisions would work with really heavy loads or fast impacts, but that’s an experiment for another day :man_scientist:

#6

As far as I am aware, having less triangles will never hurt, a one-sided object will, theoretically, be a lighter impact on performance. Collisions may be a different conversation though, I don’t know much about that.

Hope this helps.

#7

There’s not really such thing as a side, so “two sides” means 2 triangles. So if you have 2 triangles per 3 verts instead of 1, yes this will definitely hurt rendering performance

Physics this shouldn’t matter for since a separate mesh is used for these calculations which are usually generated to be efficient (hull) or a primitive type (i.e. box)