Light shafts start to penetrate objects. This can be solved by restarting the editor. Shift + N – deselect For Matinee camera it is better to import it with the density of the trajectories of at least 50-60 frames per
some tips on the usage of APEX in the UDK APEX 1.1 is only supported starting with the March 2012 version of the UDK *. apx of a selected mesh from the Maya\Max is exporting clothing properties and collision bodies.
A very interesting approach to optimize the rendering on a mobile platform, an example of good level design. http://udk.com/showcase-amazing-one-texture