# fx_skid
Multiply-blended surface shader for tyre skid marks (`nring.carfx`): one
hardware-instanced flat quad per mark segment, laid a few centimetres above the
asphalt along each sliding tyre's path. Across the tyre it draws soft shoulders
and four tread grooves; along it, a little streaky breakup. lane0 = segment
sequence number, strength 0..1, seed. Material `head` (newest sequence) and
`ring` (ring size) fade the oldest `fade_share` of the ring away as new rubber
is laid; `rubber` is what a full-strength mark multiplies the road colour by.
▲ 0↑ born
backing path · art/fx/fx_skid_mat.material
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