sharpdx/SharpDX — pull request #430 by jwollen (2014-07-01 21:41:46+00:00)
Title: [SharpDX] Revised Quaternion, Matrix3x3 and Matrix LookAt and Billboard methods

Includes the following changes:

1. Matrix3x3: Split Billboard into BillboardRH and BillboardLH variants
2. Quaternion:
- Removed broken RotationLookAt methods
- Brought LookAtRH and LookAtLH signatures in line with Matrix equivalents
- Implemented LookAtRH/LH and BillboardRH/LH methods using Matrix3x3 methods
3. Matrix: Flipped BillboardRH/LH orientation, as they were facing away from the camera position. This might have been an oversight when porting from SlimMath, as there was only a single version of undocumented handedness.