Help me, please, as fix convert quartenion to euler angles in .ipl files

[LeroY]

Help me, please, as fix convert quartenion to euler angles in .ipl files
I'm getting an incorrect turn of the object.
But this does not happen with all the objects, but only with a part.

 

function quaternionToEuler(q) 
	q.x = q[1] 
	q.y = q[2] 
	q.z = q[3] 
	q.w = q[4] 
	local sqx = q.x * q.x 
	local sqy = q.y * q.y 
	local sqz = q.z * q.z 
	local sqw = q.w * q.w 
	local unit = sqx + sqy + sqz + sqw 
	local test = (q.x * q.y) + (q.z * q.w) 
	if (test > 0.499999999 * unit) then 
		return {0.0,(2 * math.atan2( q.x, q.w ) * 57.295779513082320876798154814105) % 360,90.0} 
	elseif ( test < -0.499999999 * unit ) then 
		return {0.0,(-2 * math.atan2( q.x, q.w ) * 57.295779513082320876798154814105) % 360,270.0} 
	end 
	return 
	{ 
		(math.atan2((2 * q.x * q.w) - (2 * q.y * q.z) , 1 - (2 * sqx) - (2 * sqz)) * 57.295779513082320876798154814105) % 360, 
		(math.atan2((2 * q.y * q.w) - (2 * q.x * q.z) , 1 - (2 * sqy) - (2 * sqz)) * 57.295779513082320876798154814105) % 360, 
		(math.asin(2 * test) * 57.295779513082320876798154814105) % 360 
	} 
end

 

[LeroY]

up, help please

[AfterAll14]

At some point I tried hard to solve GTA quaternions. I implemented all possible formulas, none of it worked correctly in GTA SA. It only works for Z rotation. X and Y rotations are screwed by rockstart itself, I guess specifically to prevent modding. So, I'm afraid there's no solution.

[LeroY]

1 hour ago, AfterAll14 said:

At some point I tried hard to solve GTA quaternions. I implemented all possible formulas, none of it worked correctly in GTA SA. It only works for Z rotation. X and Y rotations are screwed by rockstart itself, I guess specifically to prevent modding. So, I'm afraid there's no solution.

can it be possible to somehow translate this function into a reverse action?
its author Essle

Function to translate angles of Euler into quaternions.

• Arguments: RotX, RotY, RotZ
• Return: RotX, RotY, RotZ, RotW

• function math.quaternion(x, y, z)
  	local c = { math.cos(math.rad(-x)), math.cos(math.rad(-y)), math.cos(math.rad(z)) }
  	local s = { math.sin(math.rad(-x)), math.sin(math.rad(-y)), math.sin(math.rad(z)) }
  	local t = { c[2] * c[3], s[1] * s[2] * s[3] + c[1] * c[3], c[1] * c[2] }
  	return 
  	math.drt(1.0 + t[1] - t[2] - t[3], (c[3] * s[1] - c[1] * s[2] * s[3]) - (-s[1] * c[2])),
  	math.drt(1.0 - t[1] + t[2] - t[3], s[2] + (c[1] * s[2] * c[3] + s[1] * s[3])),
  	math.drt(1.0 - t[1] - t[2] + t[3], (s[1] * s[2] * c[3] - c[1] * s[3]) - (c[2] * s[3])),
  	math.drt(1.0 + t[1] + t[2] + t[3])
  end
  
  function math.drt(a, b)
  	a = math.sqrt(math.max(0.0, a)) * 0.5
  	return (b and ((b < 0) and -math.abs(a) or math.abs(a)) or a)
  end

[LeroY]

In general, it seems just impossible. Just manually re-create the mapping. THE TOPIC IS CLOSED!

[AfterAll14]

I'd suggest you to use this code to get rotations of all objects first, then manually fix the angles of those who have non-zero XY rotations.