|Category||Farming Simulator 2009|
|Andreas Großschedl (unknown)||23.08.2010 12:21|
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!
rz=z/math.sqrt(math.pow(x , 2) + math.pow(y , 2) + math.pow(z-1, 2));
maybe someone can help me?
|Stefan Geiger - GIANTS Software||26.08.2010 08:56|
|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
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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