Usually you can buy a 3d model of generically similar to your car, or find it for free on the various repositories.
https://duckduckgo.com/?q=3d+capture...deos&ia=videos
3D capture is free on a smart phone. This generates a triangulated point cloud. The re-topo reduces the number of faces by orders of magnitude and reorders to quads. This reduces the task calculating the physics.
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.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
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.Because much of what is in the published literature is nonsense,
and much of what isn’t nonsense is not in the scientific literature.
-- Sabine Hossenfelder
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