* DemoLib/Vertex.cs: Added 2 more constructors based on float arrays.
(Set): New convenience methods to set x, y, z, and w
* DemoLib/Vector.cs: Added 2 more constructors based on float arrays.
(Set): New convenience methods to set x, y, z, and w
svn path=/trunk/DemoLib/; revision=74588
* DemoLib/Vector.cs: Added more special vectors
(x2y2z2): Renamed to LengthSquared
(Cross): Fixed a 3am typo that caused the cross-product methods to
be broken
(Angle): Added a static version of this method
(Normal): Return this if the length is 1
(Normalize): No-op if the length is 1
svn path=/trunk/DemoLib/; revision=74585
Jeffrey Stedfast