[HELP] Quaternions convert to MTA rotation?

[[EFO]Kesha_F1]

Hello guys. I need your help in problem with convert quaternions to MTA rotation! Maybe you know some working formula or some script, which help convert standard GTA mods to MTA?

Example:

ORIGINAL

ID#, DFF Name, Interior#, X-Coord, Y-Coord, Z-Coord, RotationX, RotationY, RotationZ, RotationW, Flags

4816, ROCKLIFF1_LAS, 0, -2139.11, 1739.76, 2.75, 1.32679e-06, 1.32679e-06, -1, 1.76038e-12, -1

How convert in MTA rotation?

Cheers,

Kesha_F1.

[sbx320]

The rotation you're searching for should be (0|-180|0).

These two functions might help for automatic processing of .ide's:

(Keep in mind that math.toeuler takes w as first parameter, while in .ide's W is the last rotation parameter)

  
-- Return order is w, x, y, z 
function math.toquaternion(x, y, z) 
    x = math.rad(x)/2 
    y = math.rad(y)/2 
    z = math.rad(z)/2 
    return 
        math.cos(x) * math.cos(y) * math.cos(z) - math.sin(x) * math.sin(y) * math.sin(z), 
        math.sin(x) * math.sin(y) * math.cos(z) + math.cos(x) * math.cos(y) * math.sin(z), 
        math.sin(x) * math.cos(y) * math.cos(z) + math.cos(x) * math.sin(y) * math.sin(z), 
        math.cos(x) * math.sin(y) * math.cos(z) - math.sin(x) * math.cos(y) * math.sin(z) 
end 
  
function math.toeuler(w, x, y, z) 
    return  
        math.deg(math.atan2(2*(y*w-x*z), 1-2*y^2-2*z^2)), 
        math.deg(math.asin(2*(x*y+z*w))), 
        math.deg(math.atan2(2*x*w-2*y*z,1-2*x^2-2*z^2)) 
end 
  

Edited May 12, 2014 by Guest

[[EFO]Kesha_F1]

sbx320, Thank you for answer. Check please result of convert to Euler Angles and back! This formula returns completely different values!

print( "-0.230214, 0.679713, 0.668583, -0.194906" ) 
local w 
local x, y, z = math.toeuler( -0.194906, -0.230214, 0.679713, 0.668583 ) 
w, x, y, z = math.toquaternion(x, y, z) 
print( x .. ", " .. y .. ", " .. z .. ", " .. w ) 

[[EFO]Kesha_F1]

sbx320, Checked the work updated formula. The example above is now working. But some objects receive incorrect values​​.

I guess the formula either incorrect or incomplete. Perhaps in the formula necessary to consider how the object is rotated or negative/positive values quaternion.

[sbx320]

I had some troubles when I converted ides to MTA objects a few months back. Going to look into that again when I get home. Should totally be solveable.

[[EFO]Kesha_F1]

I had some troubles when I converted ides to MTA objects a few months back. Going to look into that again when I get home. Should totally be solveable.

If we are together, we will solve this complex problem - we will give the community great opportunity to convert maps in GTA to MTA!

P.S. No doubt we'll add you to the list of authors the script.

[Woovie]

sbx320 will probably solve it at a C++ level, not Lua.

[[EFO]Kesha_F1]

sbx320 will probably solve it at a C++ level, not Lua.

I understand, then do not need a special converter IPL->MAP or what?

P.S. Possible, the objects are placed askew, if the angle is greater than 180 degrees. Maybe need ingreese check to 360 degrees?

P.P.S. Example with sbx320 formulas:

- Tower correct

- Lights spot not correct