Fixed a bug in the ray/plane intersection test which caused rejection when the plane was facing back.
Fixed a bug in the ray/plane intersection test which caused rejection when the plane was facing back.

sparkslabs/kamaelia,sparkslabs/kamaelia,sparkslabs/kamaelia,sparkslabs/kamaelia,sparkslabs/kamaelia,sparkslabs/kamaelia,sparkslabs/kamaelia,sparkslabs/kamaelia,sparkslabs/kamaelia,sparkslabs/kamaelia