attempt to call field 'invert' (a nil value)

[VenomOG]

invert = {}
matrix = {}
mat = {}
function getOffsetFromXYZ( mat, vec )
    -- make sure our matrix is setup correctly 'cos MTA used to set all of these to 1.
    mat[1][4] = 0
    mat[2][4] = 0
    mat[3][4] = 0
    mat[4][4] = 1
    mat = matrix.invert( mat )
    local offX = vec[1] * mat[1][1] + vec[2] * mat[2][1] + vec[3] * mat[3][1] + mat[4][1]
    local offY = vec[1] * mat[1][2] + vec[2] * mat[2][2] + vec[3] * mat[3][2] + mat[4][2]
    local offZ = vec[1] * mat[1][3] + vec[2] * mat[2][3] + vec[3] * mat[3][3] + mat[4][3]
    return {offX, offY, offZ}
end
veh = createVehicle(431,0,0,3)
obj = createObject(14399,0,0,0)
attachElements(obj,veh,0,0,3)

addCommandHandler("offset",
function ()
    mat = getElementMatrix(veh)
    x,y,z = getElementPosition(obj)
    vec = Vector3(x,y,z)
    offsetTable = getOffsetFromXYZ(mat,vec)
    outputChatBox(offsetTable[1]..", "..offsetTable[2]..", "..offsetTable[3])
end
)

 

[URBAN]

https://github.com/davidm/lua-matrix/blob/master/lua/matrix.lua add matrix functions from there