Freshly updated Ldraw.xml

[Rolf Osterthun]

Hey Magnus,

thanks for sharing your collected information.

ax, ay and az define the direction of the vector around which the rotation is to be performed. Angle of the rotation is expressed in radian (angle in radian = angle in degrees * Pi / 180)

Any a-value between 0 and +/-1 is possible.
90 degrees = 1.570796
180 degrees = 3.141592
More than one rotation direction is possible in the same translation, but only one angle.

The a-values define a vector (or a direction) where the part will be rotated around by the defined angle. Normally the vector should have the length 1. So it is possible to have the simple vectors:

• 1, 0, 0; rotation around the positiv x-axis
  
• 0, 1, 0; rotation around the positiv y-axis
  
• 0, 0, 1; rotation around the positiv z-axis
  

But it is also possible to rotate the parts around any other vector. E.g.:

• 0.7071, 0.7071, 0; rotation around a vector in the x-y-plane
  
• 0.7071, 0, 0.7071; rotation around a vector in the x-z-plane
  
• ...
  

And you can reach the final destination by more than one way. For example, if you rotate a part around the positiv z-axis by 90° you will get the same result as if you rotate the same part around the negativ z-axis by 270° (or -90°) and so on.

I think the technic is also described here.

(Only for addition) Rolf