RevitLookup.Test.SDKSamples.StructuralSample.StructSample.VecAngle C# (CSharp) Method

        private double VecAngle( UV va, UV vb )
        {
            UV vecA = VecNormalise( va );
              UV vecB = VecNormalise( vb );

              return ( ACos( VecDot( vecA, vecB ) ) );
        }