![]() ![]() I am also having problems with the UNITS command I cannot locate the global measurement change. Once I scale the line up by a factor of 25.4 then I have a line 25.4 INCHES long (which is 645.16 millimeters long). ![]() If I draw a line 1 inch long then I have already drawn a line that is 25.4 millimeters long. Should a drawing not be the same size regardless of measurement system? If I continually re-scale my drawing then I will encounter rounding errors that will alter the dimensions of the drawing. I do not understand why you need to scale a drawing to convert it to another measurement system? The above scenario indicates that when you scale a drawing you are changing the SIZE of the drawing not the UNITS. But if I have converted my drawing to millimeters why does the engraving program still register the drawing size as inches? I now import my text blocks into the drawing and then when I export the drawing as an AutoCAD 12 *.dxf file, to import into an engraving program, the other program sees a rectangle (with text blocks) that is 279.4 INCHES (not millimeters) wide by 177.8 INCHES tall. If I draw a rectangle in AutoCAD 2002 of size 11" by 7" and then convert it into millimeters (according to the above) it must be scaled up by a factor of 25.4. Virtually all user-specified information in a drawing file can be represented in DXF format.I am still having problems with this entire concept of scaling to convert measurement systems. This value also indicates the meaning of a data element for a given object (or record) type. A group code's value indicates what type of data element follows. The data format of a DXF is called a "tagged data" format, which "means that each data element in the file is preceded by an integer number that is called a group code. THUMBNAILIMAGE section Contains the preview image for the DXF file. OBJECTS section Contains the data that apply to nongraphical objects, used by AutoLISP, and ObjectARX applications. ENTITIES section This section contains the drawing entities, including any Block References. TABLES section This section contains definitions of named items.īLOCKS section This section contains Block Definition entities describing the entities comprising each Block in the drawing. Generally does not provide sufficient information to allow interoperability with other programs. CLASSES section Holds the information for application-defined classes whose instances appear in the BLOCKS, ENTITIES, and OBJECTS sections of the database. Each parameter has a variable name and an associated value. ![]() The basic organization of a DXF file is as follows: HEADER section General information about the drawing. For these reasons many CAD applications use the DWG format which can be licensed from Autodesk or non-natively from the Open Design Alliance.ĪSCII versions of DXF can be read with any text editor. Other object types, including AutoCAD 2006's dynamic blocks, and all of the objects specific to the vertical market versions of AutoCAD, are partially documented, but not well enough to allow other developers to support them. Certain object types, including ACIS solids and regions, are not documented. : 59 Earlier versions support only ASCII.Īs AutoCAD has become more powerful, supporting more complex object types, DXF has become less useful. Versions of AutoCAD from Release 10 (October 1988) and up support both ASCII and binary forms of DXF. ![]() Autodesk now publishes the DXF specifications online. For many years, Autodesk did not publish specifications, making correct imports of DXF files difficult. January 2007 16 years ago ( 2007-01) ĪutoCAD DXF (Drawing Interchange Format, or Drawing Exchange Format) is a CAD data file format developed by Autodesk for enabling data interoperability between AutoCAD and other programs.ĭXF was introduced in December 1982 as part of AutoCAD 1.0, and was intended to provide an exact representation of the data in the AutoCAD native file format, DWG (Drawing). ![]()
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