Reactor.RCamera.UpdateViewMatrix C# (CSharp) Method

        private void UpdateViewMatrix()
        {
            Matrix.CreateFromQuaternion(ref orientation, out viewMatrix);

            xAxis.X = viewMatrix.M11;
            xAxis.Y = viewMatrix.M21;
            xAxis.Z = viewMatrix.M31;

            yAxis.X = viewMatrix.M12;
            yAxis.Y = viewMatrix.M22;
            yAxis.Z = viewMatrix.M32;

            zAxis.X = viewMatrix.M13;
            zAxis.Y = viewMatrix.M23;
            zAxis.Z = viewMatrix.M33;

            if (behavior == Behavior.Orbit)
            {
                // Calculate the new camera position based on the current
                // orientation. The camera must always maintain the same
                // distance from the target. Use the current offset vector
                // to determine the correct distance from the target.

                eye = target + zAxis * orbitOffsetLength;
            }

            viewMatrix.M41 = -Vector3.Dot(xAxis, eye);
            viewMatrix.M42 = -Vector3.Dot(yAxis, eye);
            viewMatrix.M43 = -Vector3.Dot(zAxis, eye);

            viewDir.X = -zAxis.X;
            viewDir.Y = -zAxis.Y;
            viewDir.Z = -zAxis.Z;
            viewDir.Normalize();
        }