Generating DXF files, problems with extrusion direction

I am writing a programme to create DXF files for import into autocad. I need to create a complex three dimensional object with solid colour. I have a mesh for the shape I want to make, but I am defeated by the way that the dxf file format represents world and object co-ordinates. Can anyone tell me how I translate from a set of (x,y,z) coordinates into the numbers for the codes (10,20,30 etc .... 210,220,230) necessary for the SOLID object.

Thanks

Trevor

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Dr Trevor Cox
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