By the way I'm not sure to what extent moving uphill or downhill affects movement right now but it should make a BIG difference.

From what I've seen it makes NO difference, you can sprint up-hill.

I'm not sure, but after coming up the water you should be heavier because you're wet

Voted for slowing in bushes but I don't think there is much difference running in grass or road.

voted up, i fogot to make the request, fórum thread
http://forums.bistudio.com/showthread.php?157056-Run-in-bush

Yeah, perhaps not much different running on grass or asphalt...

Upvoted with the condition of improving fatigue system, operators get fatigued very quickly even with light weight

Related to #5681

Currently slope of terrain affects fatigue, but not speed. I agree that speed should also be affected by slope. Adding modifiers for different surface types would also be great (this is already done to vehicles).

To do some testing with speed and fatigue, use this script. It starts displaying the players info in a hint, with the argument defining the update frequency. It measures current speed via four ways (3d/2d first principles from polled positions, and using speed and velocity engine commands) to check discrepancies . It also shows the engine's 2D only method of applying movement speed (means sprinting up/down a steep hill is actually moving faster than over flat ground)

//example: 1 execVM "monitorMovement.sqf"
CEEB_fnc_distanceFP3D = compile
"
sqrt
(
(((_this select 0) select 0) - ((_this select 1) select 0)) ^ 2
+
(((_this select 0) select 1) - ((_this select 1) select 1)) ^ 2
+
(((_this select 0) select 2) - ((_this select 1) select 2)) ^ 2
)
";

sleep 1;

_step = _this; update delay
_oldPos = [0, 0, 0]; last check position
_newPos = [0, 0, 0]; new check position
_3dDist = 0; 3d distance from first principals
_2dDist = 0; 2d (horz plane) distance from first principals
_3dSpeed = 0; 3d speed in km/h
_2dSpeed = 0; 2d (horz plane) speed in km/h
_veloSpeed = 0; 3d speed in km/h from engine velocity command
_rise = 0; 2d (horz plane) difference
_run = 0; vertical difference
_slope = 0; angle in degrees between old and new positions
_oldFatigue = 0; last fatigue
_newFatigue = 0; new check fatigue
_fatigueTime = 0; time to max/min fatigue

while {true} do
{
_newPos = visiblePositionASL vehicle player;
_3dDist = [_oldPos, _newPos] call CEEB_fnc_distanceFP3D;
_2dDist = [[(_oldPos select 0), (_oldPos select 1), 0], [(_newPos select 0), (_newPos select 1), 0]] call CEEB_fnc_distanceFP3D;

_newFatigue = getFatigue vehicle player;
_fatigueCost = (_newFatigue - _oldFatigue) / _step;
if (_fatigueCost == 0)
then {_fatigueTime = 0;}
else {_fatigueTime = 1 / _fatigueCost;};

_3Dspeed = _3dDist / _step * 3.6;
_2Dspeed = _2dDist / _step * 3.6;
_veloSpeed = ([[0, 0, 0], velocity vehicle player] call CEEB_fnc_distanceFP3D) * 3.6;

_rise = (_newPos select 2) - (_oldPos select 2);
_run = [[(_newPos select 0), (_newPos select 1), 0], [(_oldPos select 0), (_oldPos select 1), 0]] call CEEB_fnc_distanceFP3D;
if (_run == 0) then {_slope = 0;} else {_slope = atan (_rise / _run);};

hintSilent composeText

[
parseText "<t color='#ff0000'>Movement monitor</t>", linebreak,
parseText format ["<t align='left'>Fatigue: %1</t>", _newFatigue], lineBreak,
parseText format ["<t align='left'>Fatigue Cost/s: %1</t>", _fatigueCost], lineBreak,
parseText format ["<t align='left'>Time to exhaustion (s): %1</t>", _fatigueTime], lineBreak,
parseText format ["<t align='left'>FP 3D Speed: %1</t>", _3dSpeed], lineBreak,
parseText format ["<t align='left'>FP 2D Speed: %1</t>", _2dSpeed], lineBreak,
parseText format ["<t align='left'>Speed: %1</t>", speed vehicle player], lineBreak,
parseText format ["<t align='left'>Veloctiy 3D Speed: %1</t>", _veloSpeed], lineBreak,
parseText format ["<t align='left'>Angle: %1</t>", _slope]
];

_oldPos = _newPos;
_oldFatigue = _newFatigue;
sleep _step;
};

http://forums.bistudio.com/showthread.php?157056-Run-in-bush