Here you will find 3 separate spreadsheets to help with tyre development. The first, and primary, is 'TGM Generator'. While helpful, it is still quite involved to actually create a tyre. This is always going to be the first step, creating an actual testable .tgm tyre file, which is capable of being analysed within tTool (our tyre 'compiler' and analyser as it were).
The second spreadsheet, the QSA batch test generator, can help with analysis of the .tgm within tTool, by creating batch tests for your analysis. This is quite broad and free, if you happen to have tyre data, you can fill in relevant data, and have a direct comparison between your tyre and a set of data. This primarily concerns stiffness data. You can't analyse things like grip with the QSA batch tester however, as there is no friction model or thermal model within the QSA as such, you need to compile a tyre before that.
The final spreadsheet covers the real-time batch test generator. This entails a broad set of tests that can help you build slip tables, rolling resistance tables, among other things. This will help determine tyre properties and can allow you to visually see the changes you make to a tyre in a fully controlled environment. It requires a fully generated .tgm file with lookup table parameters in order to provide data.
We will continue updating this section with more information in the near future as we continue to enhance our support for modders
TGM Generator
TGM Gen V0.33 - GY F1 1975 Front.ods
About:
Fill out details on each page, in the white or yellow boxes.
Then click "Generate TGM(s)" on About sheet, don't worry about any slight problems with formatting (spacing), tTool will take care of it!
Keep in mind this spreadsheet is still WIP, so things will change and hopefully improve.
Grey 'boxes' are generally either 'unimplemented' or it's recommended not to touch those values as they may contain formulas. See the “Keys” on the About sheet →
Only symmetrical tyres are fully supported, for now, though recent changes should make non-symmetrical tyres work it has not been thoroughly tested.
Cells are unprotected, so it's easily screw something up!!!
'General / Easy' sheet is incomplete and still under brain-storming phase. So it doesn’t fully influence the tyre in the way that you might expect. It does help to set some baselines, though.
Please ensure you are running the V5.4 branch of LibreOffice. (https://www.libreoffice.org/download/download/?type=win-x86_64&version=5.4.6&lang=en-US)
This spreadsheet is optimised for resolutions of 2560x1440 or greater (I've tried to make allowances for 1080p).
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5) Moving onto the Construction sheet. Starting at C4, you can specify material properties for several textiles and rubbers that build up a tyre. Textiles and positioning are free, but the names are there for reference / consistency, that is, you could put a belt ply under 'ply1'. The aliases help us by keeping the construction consistent and organised. You'll need to specify reasonable materials for each part of the tyre, if you don't find anything reasonable in the list, you can add more in the “Materials” sheet. For textiles, you need to specify the bounds, the "Start" and "End" node of the ply. The grey boxes with start and end are symmetrical copies for the right hand side of the tyre. I strongly advise not to touch them unless you know what you're doing. Plies will only be active if you specify both a range of nodes and material name from the drop-list. Body plies typically span the entire tyre, from node 0 to node 76 (or however many you have), whereas belts should start somewhere around the tyre shoulder.
6) Staying on the Construction page, scroll down to C38. Here you can fill in your ply thickness and spacings. Just below are the belt angles. It does not quite support some of the modern exquisite ply angling techniques, such as geodesic body plies, however you can customise your own shape should you need to deal with exotic ply angling techniques.
7) Now it's time to move to the “TGM” page. On the top left, you'll be greeted immediately by the test conditions. Fill in reasonable ranges for gauge pressures, temperatures and speeds.
Depending on your confidence of your tyre design, you'll need at least 2 for each of those. If you're confident with your tyres, add more to improve the detail, the drawback is that tTool will take longer with more tests, so only increase them once you’re satisfied with your tyre.
8) Now that you have specified valid boundaries for your tyres. Go to the 'About' sheet, and click on "Export TGM(s)", and load the resulting file in tTool, and you should be ready to begin generating your first tyre. Note that if you haven't touched the real-time section in this spreadsheet, it's likely to be WAY off the mark. For details on running tTool see below:
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1) Open the rF2 Launcher.
2) Click the configuration page the 'cogwheel'.
3) Select 'Developer'
4) Enter "+tTool" as a command line parameter, and click 'save' on the right hand side.
5) Click "Dev Mode"
6) tTool will load up, under the "I/O - File Name" type the correct filename (including extension, i.e. .tgm)
7) Click 'Display 3D' to show your tyre.
8) Scroll to the bottom, and select 'Run Automated' if you want to generate a corresponding lookup table for your tyre.