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Only the Hexen algorithm has all three values.Īlso called 'old falling damage' since they were implemented first. The 'minimum kill speed' is the minimum velocity that will provoke an instant death. The 'death threshold' is the maximum speed you can have that will not inflict lethal damage, it is represented by the blue area below the Hexen line. The 'maximum safe speed' is the maximum velocity you can have before triggering falling damage. The following chart gives a few values to estimate the landing speed in map units per tics for drops of various heights, using the default conditions, as well as a graph showing damage inflicted as a function of the landing speed for all three falling damage models.ĭamage inflicted (vertical axis) in function of landing speed (horizontal axis) The default values are all 1.0, so a fall lasting one second (35 tics) gives an accumulated speed of 36 in the default conditions.

The actor's own Gravity property in DECORATE, possibly modified through ACS with the APROP_Gravity property.

The sector's own gravity, as defined in UDMF with the gravity sector property and in Hexen format with the Static_Init special possibly modified with Sector_SetGravity.

Note that this value is set on a scale of 800.

The level's overall gravity, as defined in MAPINFO with the gravity map property.

There is no terminal velocity.Īn actor's gravity factor is the product of the following factors:

The physics model inherited from vanilla Doom has the peculiarity of giving gravity an 'initial boost' by doubling it when the fall begins, so after four rounds of free fall, the momentum acquired is five times the gravity factor, not four times.

If an actor is standing in mid-air, its downward speed is increased each tic by its gravity factor. Internally, a downward velocity is a negative number but its absolute is used for these computations so this article will treat downward velocity as a positive value. All falling damage computation rely on the player's downward velocity, expressed as a fixed point number.

Zdoom bouncing projectile disappear when touching sky