Physics

I am creating a physics simulation using Unity C#

Using the rigidbody but with my own implementation of the forces being applied to the world.

Gravity applied by accelerating all objects to the ground with -9.81m/s velocity

Drag applied using the drag equation Fd = 0.5 p u^2 cd A

p - density of air calculated by getting the characters Y axis value and mapping against table to calculate air density which changes as the vehicle gains altitude to allow for aeroplanes performance changing at heights

u - velocity taken from characters rigidbody component

cd - magic number coefficient used to approximate drag factor

A - cross sectional area calculated by generating a grid of raycasting nodes in front of the players movement vector, each node hit is counted and represents a 10cm^2 surface area. All raycast hit normals are averaged to determine if a y component of drag needs to be included to give lift to an aeroplane or downforce to a spoiler wing

Friction, suspension both need implementing