   Projective Textures: Reverse Projection
  Hi.  I''m working on getting projective textures running smoothly, and everything''s going well, except for one thing...I''m not sure how to eliminate the reverse projection that that occurs.  I read somewhere that using a 1D texture can solve the problem, but I''m really not sure how I''d go about doing that.  Any help with this is greatly appreciated. 