Writing .rbxm files

Help and Feedback Scripting Support
1

Hey everyone,

.rbxm files are Roblox model files used to store Roblox models. In Roblox Studio, you would make them by selecting something and saving it as a file. You can then load it in from the import model button or by dragging it into the viewport.

I want to know how you can write a .rbxm file outside of Roblox studio. I would like externally in another programming language to create a .rbxm file and store information in there so that a user can use it in Roblox Studio.

Has anyone figured this out already?

2

.rbxm is binary, unless you understand how to write binary then you can use that, or you can use .rbxmx which is xml

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3

You can use .rbxmx instead of .rbxm which is the same thing, but instead of a binary it is in an xml format.

This is a file type you can export your builds as.

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Everything you need to know can be learned by just analyzing these .rbxmx files.

Here is an example of a baseplate:

<roblox xmlns:xmime="http://www.w3.org/2005/05/xmlmime" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="http://www.roblox.com/roblox.xsd" version="4">
	<Meta name="ExplicitAutoJoints">true</Meta>
	<External>null</External>
	<External>nil</External>
	<Item class="Part" referent="RBX29AC4E98D5FA4629A3F641FDE153E965">
		<Properties>
			<bool name="Anchored">true</bool>
			<BinaryString name="AttributesSerialize"></BinaryString>
			<float name="BackParamA">-0.5</float>
			<float name="BackParamB">0.5</float>
			<token name="BackSurface">0</token>
			<token name="BackSurfaceInput">0</token>
			<float name="BottomParamA">-0.5</float>
			<float name="BottomParamB">0.5</float>
			<token name="BottomSurface">4</token>
			<token name="BottomSurfaceInput">0</token>
			<CoordinateFrame name="CFrame">
				<X>0</X>
				<Y>-10</Y>
				<Z>0</Z>
				<R00>1</R00>
				<R01>0</R01>
				<R02>0</R02>
				<R10>0</R10>
				<R11>1</R11>
				<R12>0</R12>
				<R20>0</R20>
				<R21>0</R21>
				<R22>1</R22>
			</CoordinateFrame>
			<bool name="CanCollide">true</bool>
			<bool name="CastShadow">true</bool>
			<int name="CollisionGroupId">0</int>
			<Color3uint8 name="Color3uint8">4284702562</Color3uint8>
			<PhysicalProperties name="CustomPhysicalProperties">
				<CustomPhysics>false</CustomPhysics>
			</PhysicalProperties>
			<float name="FrontParamA">-0.5</float>
			<float name="FrontParamB">0.5</float>
			<token name="FrontSurface">0</token>
			<token name="FrontSurfaceInput">0</token>
			<float name="LeftParamA">-0.5</float>
			<float name="LeftParamB">0.5</float>
			<token name="LeftSurface">0</token>
			<token name="LeftSurfaceInput">0</token>
			<bool name="Locked">true</bool>
			<bool name="Massless">false</bool>
			<token name="Material">256</token>
			<string name="Name">Baseplate</string>
			<float name="Reflectance">0</float>
			<float name="RightParamA">-0.5</float>
			<float name="RightParamB">0.5</float>
			<token name="RightSurface">0</token>
			<token name="RightSurfaceInput">0</token>
			<int name="RootPriority">0</int>
			<Vector3 name="RotVelocity">
				<X>0</X>
				<Y>0</Y>
				<Z>0</Z>
			</Vector3>
			<int64 name="SourceAssetId">-1</int64>
			<BinaryString name="Tags"></BinaryString>
			<float name="TopParamA">-0.5</float>
			<float name="TopParamB">0.5</float>
			<token name="TopSurface">3</token>
			<token name="TopSurfaceInput">0</token>
			<float name="Transparency">0</float>
			<Vector3 name="Velocity">
				<X>0</X>
				<Y>0</Y>
				<Z>0</Z>
			</Vector3>
			<token name="formFactorRaw">0</token>
			<token name="shape">1</token>
			<Vector3 name="size">
				<X>512</X>
				<Y>20</Y>
				<Z>512</Z>
			</Vector3>
		</Properties>
	</Item>
</roblox>
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4

If you write to an XML file like that, could you potentially stretch a model and make custom designs in the cube, because when it is read, what is there will get visualized, right?

5

I’m not sure what you’re asking. The XML is just a format to save the properties of the instance. If can do the exact same things in the property window that you can do by changing the XML file.

EX: You want to change the size. The size is defined by a Vector3 tag with the name size and has 3 sub-elements called X, Y and Z.

<Vector3 name="size">
	<X>1234</X>
	<Y>1111</Y>
	<Z>952</Z>
</Vector3>

Produces a size of Vector3.new(1234, 1111, 952)

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6

Have you tried searching GitHub?

https://github.com/search?q=rbxm

There’s a number of libraries for reading and manipulating Roblox binary files, such as rbxmk by @Anaminus (I believe that allows reading/writing binary files, but I’m sure they’ll correct me if I’m wrong).

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7

@0x6e7367 @SwagMasterAndrew Thanks so much! I completely forgot that there was an xml verison. I saw some other posts talking about it, but when I opened up the .rbxm file, it did look more like binary to me and I was wondering how people did this so quickly.

Xml is so much easier to write. :relieved:

@cxmeels I have tried searching in GitHub, but I didn’t fully know what I was searching for. Thanks for the resources!

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