Öggo's Dev Corner: Individual Meshes and Textures [v1.4.1], Hi-Res Pitcrews [v1.0]and more... [Last Update: 02/03/2025]
Posted by Öggo
With GP4 Memory Access being publicly released a couple of days ago, it's time to announce a few things I've been working on that take advantage of this new ground-breaking tool. I've decided to host everything on GitHub and keep all of these projects completely open-source, with the hope that this will encourage more modders to build on top of my work.
The DLLs are ready-to-use with GP4 Memory Access, while the libraries are meant to help other developers in their GP4 modding adventure.
To inject these DLLs using CSM, you can download csmprocess and place it in your ZaZ Tools folder. You can then use CSM's native InjectDLL setting. It's a little "temperamental", but it does work.
DLLs
Hi-Res Pitcrews
A DLL to overcome the original limitation of 400 vertices for pitcrew meshes in Grand Prix 4, allowing high resolution pitcrew meshes to be used.
Check the Releases section of the repo for download
Individual Meshes and Textures DLL
This DLL expands original Grand Prix 4 to allow full control of how meshes (front/rear wheels, helmets, cockpits, cars), collision meshes, and textures (cockpits, helmets) are loaded, supporting per-driver, per-team, and per-track custom loading. It includes features to manage LODs (Level of Detail), auto-naming conventions, and fallbacks to default GP4 assets when custom assets are unavailable.
This DLL enables, for the first time ever, the possibility of having individual cockpits, as this was not possible in native GP4.
Since version 1.2, it is also now possible to have individual collision mesh files, instead of a single generic one for all cars.
Version 1.3 introduces the possibility to use GP4's native Visor Shader (the one used for helmet Visor objects and car z_cockpit_visor objects) for cockpit meshes, basically allowing to have a proper "glass" windshield in cockpit view.
Added in version 1.4, this DLL now seamlessly fix the reversed tyre tread bug when using 3D rims.
Please carefully read the readme for detailed information about the INI file that comes with the DLL
Check the Releases section of the repo for download
Libraries
GP4 Mem Lib
A C++ library of classes and functions designed to help develop custom code for Grand Prix 4 modding and that will most likely be a constant WIP.
Ini Lib
An STL C++ INI read/write library, written mostly with Grand Prix 4 configuration files in mind
Edited 6 time(s). Last edit at 03/02/2025 08:04PM by Öggo.
The DLLs are ready-to-use with GP4 Memory Access, while the libraries are meant to help other developers in their GP4 modding adventure.
To inject these DLLs using CSM, you can download csmprocess and place it in your ZaZ Tools folder. You can then use CSM's native InjectDLL setting. It's a little "temperamental", but it does work.
DLLs
Hi-Res Pitcrews
A DLL to overcome the original limitation of 400 vertices for pitcrew meshes in Grand Prix 4, allowing high resolution pitcrew meshes to be used.
Check the Releases section of the repo for download
Individual Meshes and Textures DLL
This DLL expands original Grand Prix 4 to allow full control of how meshes (front/rear wheels, helmets, cockpits, cars), collision meshes, and textures (cockpits, helmets) are loaded, supporting per-driver, per-team, and per-track custom loading. It includes features to manage LODs (Level of Detail), auto-naming conventions, and fallbacks to default GP4 assets when custom assets are unavailable.
This DLL enables, for the first time ever, the possibility of having individual cockpits, as this was not possible in native GP4.
Since version 1.2, it is also now possible to have individual collision mesh files, instead of a single generic one for all cars.
Version 1.3 introduces the possibility to use GP4's native Visor Shader (the one used for helmet Visor objects and car z_cockpit_visor objects) for cockpit meshes, basically allowing to have a proper "glass" windshield in cockpit view.
Added in version 1.4, this DLL now seamlessly fix the reversed tyre tread bug when using 3D rims.
Please carefully read the readme for detailed information about the INI file that comes with the DLL
Check the Releases section of the repo for download
Libraries
GP4 Mem Lib
A C++ library of classes and functions designed to help develop custom code for Grand Prix 4 modding and that will most likely be a constant WIP.
Ini Lib
An STL C++ INI read/write library, written mostly with Grand Prix 4 configuration files in mind
Edited 6 time(s). Last edit at 03/02/2025 08:04PM by Öggo.
Thanks so much for sharing, looking forward to seeing the steering wheel textures become individual as well, and the increase in races over 17!
Email : deusrodelas@gmail.com
*{ Playing GP4 since 2007 }*
Email : deusrodelas@gmail.com
Very interesting features, also for non-csm users. Thank you very much for sharing your work and to make it open-source, Diego! 
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What an incredible step forward for GP4, thank you for all your efforts
Wow Diego! You, Carl_gpgames and Ronald "ZaZ" work is fantastic!
We GP4 fans thank you immensely.
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PLEASE VISIT: Grand Prix Mods Blog
We GP4 fans thank you immensely.
PLEASE VISIT: Grand Prix Mods Blog
Superb news Carl!
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PLEASE VISIT: Grand Prix Mods Blog
PLEASE VISIT: Grand Prix Mods Blog
First of all: thank you Carl for demonstrating what can be achieved with IndividualMeshesAndTextures.dll!
Speaking of, IndividualMeshesAndTextures.dll has been updated to v1.2: it is now possible to load individual collision mesh files, instead of a single generic one for all cars.
Some other things are also brewing, which I hope I'll be able to release in the near future.
Speaking of, IndividualMeshesAndTextures.dll has been updated to v1.2: it is now possible to load individual collision mesh files, instead of a single generic one for all cars.
Some other things are also brewing, which I hope I'll be able to release in the near future.
Amazing work, thank you
Another GREAT update Diego, thanks!
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