Do linear startin of walkin car into forward once press forward key

doing change position of rccar into forward when forward key pressd
how to swap into change position through velocity when velocity depends of how long forward key pressd (need to remember velocity value, how long forward key pressd)

and how to propagate velocity into smooth braking (backgroff)

connection with input interface, probably i need timer and ask program to remember time between startin and release of the key \ and it requird to use quadratic velocity dependin\ of the time

The easiest way to manage key controls is just as you said. If you are using something like this:

But not sure what you exactly need. You can measure the moment a key pressed, and as time moves, you can change velocity! Nothing very special

use keydown and keyup events, set a boolean “accelerating” to true on keydown and false on keyup, in your animation loop, lerp your current “accelerationValue” towards a maximum value if “accelerating” is true and towards 0 if false, you can use some sort of interpolation such as the default lerp which would work well if using a “gears” lookup table for min and max speeds of each gear

@Lawrence3DPK

Could you check?

rotation became not smooth then I go into these z positions
I configurd camera with arr of radial with 124 segments
and do change of 1 segment once key pressd

the issue only with this setup