Originally posted by R@nSiD I would do the render of the CGI with Motiontracking using a greenscreen background, this will make it easier to composite with the real footage in Post Production. After effects is the way ahead for working in Post. cannot agree with that. generating cgi you have the benefit in generating an alpha with your image. so... using a green background just complicates the whole thing. just render it with alpha chekced on as targa or tiff.. bam.