RotationMatrix

[guiloic]

How can I calculate the angle from a RotationMatrix ?

thx

[EgonOlsen]

This should (may...:wink: ) work:

Code Select Expand

 
public SimpleVector deriveAngles(Matrix mat) {
   SimpleVector s=new SimpleVector();
   float[] m=mat.getDump();
   s.x=(float) Math.atan(m[9]/m[10]);
   s.y=(float) Math.asin(-m[2]);
   s.z=(float) Math.atan(m[4]/m[0]);
   return s;
}

But keep in mind that rotations depend on each other, i.e. after doing a rotateX(0.1f); rotateY(0.1f); rotateZ(0.2f), the result won't be (0.1,0.1,0.2). Plus there are multiple posibilities to get the same result out of different rotations, i.e. the resulting angles show no "history" of former rotations.

Hope this helps.