That would take memory, disk space, etc, so we create them as we go. We create them dynamically because we don’t want those grids to exist in the wild for no reasons. Firstly, the fire grid is dynamically created for the damaged entity.If the kind of damage was fire based and the entity is flammable, then at least two things happen: The damage event includes how much damage was done, what kind it was and what caused it. When a game entity is damaged, it is notified by an event. The game engine tracks all damage done in the game, might it be bullet shots, impacts or fire damage. The cells have a plethora of properties, but these three are the bare minimum to propagate fire. The only difference is that we use a 2D grid for grass and a 3D grid for objects and trees.Įach cell of the grid has a position in the world, a radius and hitpoints. It is true for grass, for objects as well as for trees. The secret sauce is an equally spaced grid. That has the additional advantage to be fast to simulate and easy to understand.

Because I like to keep things simple, it doesn’t involve any complicated mathematics, physics or fluid dynamics. The fire propagation in Far Cry 2 (and Far Cry 3) has just enough realism to maintain the player’s suspension of disbelief, but certainly not enough to get published anytime soon. Since gameplay is what’s important, we sacrifice some of the realism for fun. Here, a fire cell has 50 hitpointsĪt the core, the fire propagation system is quite simple.

Far cry 2 realism mod