Watercraft parameters - Outerra/anteworld GitHub Wiki

Watercraft parameters

Used for boats/ships and amphibious vehicles only.

type	property	description	default
float4	Cx	drag coefficients for model-space directions and angular damping mod coef x: sidewise drag coefficient y: forward drag coefficient z: vertical drag coefficient w: relative angular coefficient (adjusts the computed angular damping)	(JS / Lua) {x:0.0,y:0.0,z:0.0} (C++) {0.f ,0.f ,0.f}
float	hydro_offset	distance from center of mass along z where hydrostatic force acts [m]	1
float	hydro_uplift	front uplift coefficient, N per m/s when submerged up to h1	0
float	hydro_w	width of hydro volume (0 - use bbox, <0 shrink bbox values)	0
float	hydro_wake (JS / Lua) hydro_wake_wmul(C++)	wake width multiplier	1
float	hydro_l	length of hydro volume (0 - use bbox, <0 shrink bbox values)	0
float	hydro_h1	height of the triangular prism part of the boat underwater [m]	0
float	hydro_h2	height of the box part of the boat [m]	0
float	hydro_volcoef	closed volume coefficient (0..1) Tells how much of the volume is hollow	0

Note: if hydro_volcoef is not specified or is 0, the hydrostatic forces are not computed, but the speed loss from drag still is.

Example drag coefficients in model-space dimensions:

• boats - x:1.2, y:0.1, z:1.2, w:0.9
• vehicles - x:1.2, y:0.4, z:1.2, w:0.9

You can find more about drag coefficients on http://en.wikipedia.org/wiki/Drag_coefficient