= Simulation - Particles

path:: Path of the code: [05_particles] ::

gap::

<p>The objective is to model particles falling under gravity.
Each particle has a position \(p_i\) and a speed \(v_i\).</p>

gap::

* **Fill the function `update_speed`** (file `src/simulation/simulation.cpp`) that applies the gravity:
** \(v = v + \Delta t \,F/m\)
** __The mass is the variable `m` of each particle.__

code::[c++]
void update_speed(particle_structure& p, float dt)
{
    vec3 const g = {0.0f, 0.0f, -9.81f};
    p.v = p.v + dt * g;
}
code::[-]

gap::s

* Note: the functions of link::https://graphicscomputing.fr/cgp/documentation/sitemap/vec.html[vec3] are listed in its documentation.

center::
videoplay::assets/video.mp4[width:100%; max-width:300px;]
caption:: Expected result ::
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