Category | Farming Simulator 2009 |

Created | 23.08.2010 12:08 |

Andreas Großschedl (Unknown) | 23.08.2010 12:21 |
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Hi! I need some help with the 3d vector: i tried to calculate the angle of a vector but the result is: -1.#IND ? I tried this: take 2 points in the 3d space, then sub one from the other, then take the unit vector (1,0,0)... for each axis and make the dotproduct. x and y were correct but with the z axis i have the problem, that the dotproduct is > 1 or < -1 and then i cannot calculate the acos! formula: rz=z/math.sqrt(math.pow(x , 2) + math.pow(y , 2) + math.pow(z-1, 2)); x=-0.16616821289063 y=0.86651611328125 z=22.773193359375 rz=1.0450703452324 maybe someone can help me? thx Andreas |

Stefan Geiger - GIANTS Software | 26.08.2010 08:56 |
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You need to normalize your vector first. local len = Utils.vector3Length(x,y,z); if len ~= 0 then x = x / len; y = y / len; z = z / len; local dotx = x; -- dot product with 1,0,0 local doty = y; -- dot product with 0,1,0 local dotz = z; -- dot product with 0,0,1 end; Btw: math.pow is quite slow. To calculate the square you might want to use x*x. It's even shorter :) |

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