Simulating CS2 smoke, flashbang, and HE grenade trajectories:

1. Initial grenade throw velocity:
   $$V_0 = \text{EyeAnglesToVector}(\text{pitch}, \text{yaw}) \times \text{ThrowPower} + \text{PawnVelocity} \times 1.25$$
2. Each physics simulation step ($dt = 0.015625\text{s}$):
   $$P_{t+1} = P_t + V_t \cdot dt$$
   $$V_{t+1} = V_t + (0, 0, -800.0) \cdot dt$$
3. On surface collision trace hit:
   $$V_{\text{bounce}} = (V_t - 2(V_t \cdot N)N) \times 0.45$$

Rendering the resulting 3D polyline with ImDrawList::AddPolyline displays the exact landing zone before releasing mouse button!

The bounce reflection formula with the 0.45 elasticity coefficient matches the Source 2 grenade physics perfectly!

Lineups for Mirage window smoke and Inferno B CT smoke become 100% consistent.