a moving function based on 3 (euler) angles

I'm still writing a program with a spaceship that moves freely through empty space.

The following function is supposed to handle the movements. The 3 lines of code seem to move the ship in
the right direction, but I want to know how to combine them so my ship can move right in all 3 (or at least 2)
directions. Hoping this function works in the first place.

// there is a ship that has a ('input')direction and a ('output')position
// the direction is noted by 3 angles ranging from 0=< angle <360, position by a vector shipPos.X, Y, Z
private void Move(float speed)
{
                // direction 1, let it yaw doesn't combine with 3 lines below direction 2
      shipPos.X += -speed * (float)Math.Sin(Geometry.DegreeToRadian(yaw));
      shipPos.Y += 0.0f;
      shipPos.Z += -speed * (float)Math.Cos(Geometry.DegreeToRadian(yaw));
      // direction 2, let it pitch doesn't combine with above 3 lines      
      shipPos.X += 0.0f;
      shipPos.Y += speed * (float)Math.Sin(Geometry.DegreeToRadian(pitch));
      shipPos.Z += -speed * (float)Math.Cos(Geometry.DegreeToRadian(pitch));
      // maybe let it roll also            
      //shipPos.X += -speed * (float)Math.Cos(Geometry.DegreeToRadian(roll));
      //shipPos.Y += 0.0f;
      //shipPos.Z += -speed * (float)Math.Sin(Geometry.DegreeToRadian(roll));
}
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DaFouAsked:
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ozoConnect With a Mentor Commented:
X =  -(float)Math.Sin(Geometry.DegreeToRadian(yaw))*(float)Math.Cos(Geometry.DegreeToRadian(pitch));
Y =  (float)Math.Sin(Geometry.DegreeToRadian(pitch));
Z =  (float)Math.Cos(Geometry.DegreeToRadian(yaw))*(float)Math.Cos(Geometry.DegreeToRadian(pitch));
shipPos.X += speed * X;
shipPos.Y += speed * Y;
shipPos.Z += speed * Z;
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DaFouAuthor Commented:
Hehe somehow it works. TYVM.
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