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JMF (Jackhammer Map Format): Difference between revisions

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The '''Jackhammer Map Format''' ('''JMF''') is a binary file format used by {{jack|4}} to store map project data before being exported to [[MAP]], like [[RMF]]. Unlike RMF, JMF supports objects being part of multiple visgroups, [[KV]]s longer than 15 characters, and Quake III patch meshes. Additionally, it can store [[path entity|paths]] in a slightly different manner, optimized for Jack's [[Path Tool (Jack)|Path Tool]].
The '''Jackhammer Map Format''' ('''JMF''') is a binary file format used by {{jack|4}} to store map project data before being exported to [[MAP]], like [[RMF]]. Unlike RMF, JMF supports objects being part of multiple visgroups, and can store {{quake3|2}} patch meshes. Additionally, it can store [[path entity|paths]] in a slightly different manner, optimized for Jack's [[J.A.C.K./Path Tool|Path Tool]].


{{warning|As of the Christmas 2023 update, JMF files from the latest paid version of Jack cannot be opened in the free version of Jack. The latest free version saves files in JMF version 121, whereas the latest paid version is
{{workaround|Using the paid version of Jack:
* {{goldsrc}} If no KVs are longer than 15 characters:
:: Resave as [[RMF]], then open the [[RMF]].
: {{goldsrc}} If KVs are longer than 15 characters:
:: Resave as [[VMF]] or export to [[MAP]].
* {{quake}} Open the JMF in a "Half-Life / TFC" game configuration, then resave as [[RMF]] or [[VMF]].
* {{quake2}}{{quake3}} Export as [[MAP]] (Groups and VisGroups will be lost).
}}
{{modernConfirm|It may be possible to create a program that strips the extra v122 information to create a v121 JMF, as the only new feature of the new version is background images for the 2D viewports.}}
}}
== Structs ==
== Structs ==
{{stub}}
See the TWHL wiki page linked [[#External links|below]].


== See also ==
== See also ==
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* [https://github.com/pwitvoet/mess/blob/master/MESS/Formats/JmfFormat.cs JmfFormat.cs] from {{mess|2}} source code
* [https://github.com/pwitvoet/mess/blob/master/MESS/Formats/JmfFormat.cs JmfFormat.cs] from {{mess|2}} source code
* [https://github.com/LogicAndTrick/sledge-formats sledge-formats] library
* [https://github.com/LogicAndTrick/sledge-formats sledge-formats] library
[[Category:File formats]]

Latest revision as of 09:47, 10 February 2025

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This page documents information about an engine not developed by Valve. This information is documented here because it has technical and/or historical relevance to Valve's engines.

The Jackhammer Map Format (JMF) is a binary file format used by J.A.C.K. J.A.C.K. to store map project data before being exported to MAP, like RMF. Unlike RMF, JMF supports objects being part of multiple visgroups, and can store Quake III Quake III patch meshes. Additionally, it can store paths in a slightly different manner, optimized for Jack's Path Tool.

Structs

Stub

This article or section is a stub. You can help by expanding it.

See the TWHL wiki page linked below.

See also

External links

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