Self-uprighting physics? (Solved)

[Taehl]

Currently, I use this bit of code to make the physics-based player character try to stand upright:

Code: Select all

local angle, avelocity, damp = player.b:getAngle(), player.b:getAngularVelocity(), 1.7
player.b:setAngularVelocity( avelocity + (-angle * damp) )

However, that can be buggy: If the player tumbles a full rotation or more, the self-uprighting will try to flip it all the way back over again, rather than just upright. How can I fix this?

[TechnoCat]

If it rotates to -2 radians, just add 2 radians. If it rotates to 1.5 radians, first subtract a radian before rotating to 0. Try that sort of thing.

[Taehl]

I think I've hacked out a solution:

Code: Select all

local angle, avelocity, damp = player.b:getAngle(), player.b:getAngularVelocity(), 1.7
local n = (angle + math.pi) % (2 * math.pi) - math.pi
player.b:setAngularVelocity( avelocity + (-n * damp)

Is there anyone here familiar enough with radians to double-check that for me? It appears to work, but I'd like to be sure.

[kalle2990]

If you prefer to use degrees, you can convert from radians to degrees with math.deg and from degrees to radians with math.rad

[Robin]

Is there anyone here familiar enough with radians to double-check that for me? It appears to work, but I'd like to be sure.

It seems right.