public float3x3 MakeRotX( float _fAngle )
{
MakeIdentity(); float fCosine = (float) System.Math.Cos( _fAngle ); float fSine = (float) System.Math.Sin( _fAngle ); m[1, 1] = +fCosine; m[1, 2] = +fSine; m[2, 1] = -fSine; m[2, 2] = +fCosine; return this;
}