Yes, it uses the PACKAGE_HEIGHT_MAX attribute to draw the height of the package. IDF has two components to it. I'm used to the PTC version, which gives two files of *.emn and *.emp. For Solidworks, you should have files with the extention .bdf and ldf. The first contains the bare-board outline, including holes and vias and location of parts on the board (just x-y side of board and rotation). Make sure that if you are using a filter in the IDF out dialog box, that you have the filter selected correctly. If you filter out plated through holes, then it will filter them out no matter what (plated or not). It also will fail if any of your cutouts aren't fully "closed". That's because when it brings it into the MCAD world, it creates a 2D sketch and then extrudes that to the height of your board. If there's an open sketch, then it can't figure out how to draw the 3D shape from that. The second file contains all the information about your parts. It again draws a sketch, pulled from the placebound outline and extrudes those shapes to the Z-height of PACKAGE_HEIGHT_MAX and places them at the locations specified in the first file. I hope that helps a little. If you want, the IDF standard should be a text file. I just opened it up and started to figure stuff out one day because I was having problems.
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