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How can i make .dxf files??

staceystacey Posts: 72Member
Hi all :D

Does anyone know how to create a .dxf file as an input file for AutoCAD?

Thanx

- stacey xx

Comments

  • etlusketlusk Posts: 168Member
    : Hi all :D
    :
    : Does anyone know how to create a .dxf file as an input file for AutoCAD?
    :
    : Thanx
    :
    : - stacey xx
    :
    :
    Minimum Requirements
    for Creating a DXF File
    of a 3D Model


    Paul Bourke
    School of Architecture, Property, and Planning
    Auckland University, Private Bag, Auckland, New Zealand
    Fax: +64 9 3737410, Ph: +64 9 737599 x7367
    EMail: [email protected]


    Original: March 1990
    Revision: September 1993

    Introduction

    DXF is possibly the most widespread CAD exchange format in use by CAD
    packages on small computer systems. It was developed primarily by the
    AutoCAD developers and has thus received it popularity mainly from the
    high number of AutoCAD stations. Most CAD systems can export and most
    also import DXF, at least for 2D data. This document describes the
    minimum requirements needed to create a DXF description of some 3D
    object and/or scene. This description is not complete by any means but
    contains enough information for describing the geometry of many 3D
    models. A DXF file is a text only file which consists of the
    following sections: header, tables, blocks, and entities. Each section
    contains a set of groups each of which occupies two lines in the
    file. The first line is called the group code, it is an integer in the
    range of 0 to 999. The second line is called the value which depends
    on the group code. The group code indicates the type of value that
    follows according to the table below. Group code Value type 0-9
    string 10-59 real number 60-79 integer 210-239 real number 999 comment

    Header comment and header section

    It is common for the first line of a DXF file to contain a comment,
    the group code for comments is 999. A standard convention is to
    describe the creator of the DXF file in this comment. It might also be
    relevant to include the date and time of creation. The header section
    contains general information about the drawing, these are only
    relevant when creating specialised DXF files for AutoCAD. Some
    examples of what can be included in the header section are: version
    numbers, unit specification, current layer, grid spacing, tolerances,
    drawing bounds, fill mode and pattern, etc. Programs that read DXF
    files will have sensible defaults for these parameters. Since this
    document is only interested in the transfer of the geometry we don't
    need a complicated header section. A header comment and header section
    may look like the following. The model extents ($EXTMIN and $EXTMAX)
    are included here because some packages insist on it.

    999
    DXF created from
    0
    SECTION
    2
    HEADER
    9
    $ACADVER
    1
    AC1006
    9
    $INSBASE
    10
    0.0
    20
    0.0
    30
    0.0
    9
    $EXTMIN
    10
    0.0
    20
    0.0
    9
    $EXTMAX
    10
    1000.0
    20
    1000.0
    0
    ENDSEC

    Tables Section

    These can be used to specify predefined constants, line styles, text
    styles, layers, view tables, user coordinate systems, etc. We will
    only use tables to define some layers for use later on. Note: not all
    programs that support DXF import will support layers and those that do
    usually insist on the layers being defined before use. The following
    will create a default line style and initialise layers 1 and 2 for use
    later on.

    0
    SECTION
    2
    TABLES
    0
    TABLE
    2
    LTYPE
    70
    1
    0
    LTYPE
    2
    CONTINUOUS
    70
    64
    3
    Solid line
    72
    65
    73
    0
    40
    0.000000
    0
    ENDTAB
    0
    TABLE
    2
    LAYER
    70
    6
    0
    LAYER
    2
    1
    70
    64
    62
    7
    6
    CONTINUOUS
    0
    LAYER
    2
    2
    70
    64
    62
    7
    6
    CONTINUOUS
    0
    ENDTAB
    0
    TABLE
    2
    STYLE
    70
    0
    0
    ENDTAB
    0
    ENDSEC

    Blocks section

    Not necessary here but it is good form to include one anyway. The
    following is an empty block section.

    0
    SECTION
    2
    BLOCKS
    0
    ENDSEC

    Entities section

    The entities section is where the geometric elements of the model or
    scene are described. The following is the standard form of the
    entities section.

    0
    SECTION
    2
    ENTITIES

    0
    ENDSEC

    Colour

    Only index colour is supported, it is done with group code 62 within
    an entity description. The value is the colour index. The way the
    colours are mapped is dependent on the application and the hardware
    capabilities. To determine the colour mappings on a particular system
    create a number of lines segments each with a different colour and
    import that into the CAD package. Many packages that don't use an
    index colour model will simply ignore the colour instruction. See
    appendix 1 for a sample DXF file to determine the first 64 index
    colours on your system. The following will specify index colour 4

    62
    4

    Layers

    Layer numbers are specified with group code 8 within an entity
    description. The layers to be used should be defined as described
    earlier in the tables section. Most DXF importers will insist on
    predefining the layers in the tables. Note: the number of layers
    possible will vary on the software used to import the DXF file. The
    following indicates that the current entity is to be placed on layer 2

    8
    2

    Geometry

    DXF explicitly supports two 3D primitive types, namely, 3DFACE and
    3DLINE (it is usual to just use the plain LINE primitive). LINE
    consists of the two endpoints, 3DFACE specifies either three or four
    vertex facets (polygonal bounded planes). All four vertices must be
    specified, in the case of a three point facet the last vertex is
    specified twice. In general vertex group codes are numbers 10,20,30
    for the first (x,y,z) triple, 11,21,31 for the second, 12,22,32 for
    the third and 13,23,33 for the fourth. Each vertex group code is
    followed by the appropriate coordinate value. Note: that there is no
    requirement for the four vertices specifying the facet to be planar
    but it may be important for the software that imports the DXF
    file. The vertices can be ordered clockwise or anticlockwise with
    respect to the outward pointing normal, however some packages may
    insist on a particular orientation, especially rendering software.

    The following specifies a line on layer 2 of index colour number 4
    between the points (8500, -12563.4, 0) and (8500, -12563.4, 4150.99)

    0
    LINE
    8
    2
    62
    4
    10
    8500
    20
    -12563.4
    30
    0
    11
    8500
    21
    -12563.4
    31
    4150.99

    The following specifies a 4 vertex facet on layer 1 with index colour
    number 3.

    0
    3DFACE
    8
    1
    62
    3
    10
    3000
    20
    10000
    30
    5419.35
    11
    4000
    21
    10000
    31
    5605.46
    12
    4000
    22
    11000
    32
    4861.04
    13
    3000
    23
    11000
    33
    4674.94

    To create planar facets with more than 3 or 4 vertices it is necesary
    to use the POLYLINE primitive, the reader should consult the DXF
    specification for more information on this.

    End of file

    This indicates the end of the DXF file, it is not usually necessary
    but should be included for good form. Most applications expect a
    carriage return after the EOF text.

    0
    EOF

    Appendix 1

    The following can be used to determine the colour mapping used on your
    system. It contains 64 line segments with colours from 0 to 63. Note
    that many CAD packages only support 8 colours, also the following will
    indicate whether your package starts its colour numbering at 0 or 1
    (the two most common choices)

    999
    Colour
    0
    SECTION
    2
    HEADER
    9
    $ACADVER
    1
    AC1006
    9
    $INSBASE
    10
    0.0
    20
    0.0
    30
    0.0
    9
    $EXTMIN
    10
    0.0
    20
    0.0
    9
    $EXTMAX
    10
    1000.0
    20
    1000.0
    9
    $LINMIN
    10
    0.0
    20
    0.0
    9
    $LINMAX
    10
    1000.0
    20
    1000.0
    0
    ENDSEC
    0
    SECTION
    2
    TABLES
    0
    TABLE
    2
    LTYPE
    70
    1
    0
    LTYPE
    2
    CONTINUOUS
    70
    64
    3
    Solid line
    72
    65
    73
    0
    40
    0.000000
    0
    ENDTAB
    0
    TABLE
    2
    LAYER
    70
    6
    0
    LAYER
    2
    1
    70
    64
    62
    7
    6
    CONTINUOUS
    0
    ENDTAB
    0
    TABLE
    2
    STYLE
    70
    0
    0
    ENDTAB
    0
    ENDSEC
    0
    SECTION
    2
    BLOCKS
    0
    ENDSEC
    0
    SECTION
    2
    ENTITIES
    0
    LINE
    8
    1
    62
    0
    10
    0
    20
    0
    30
    0
    11
    0
    21
    0
    31
    1
    0
    LINE
    8
    1
    62
    1
    10
    0.05

    20
    0
    30
    0
    11
    0.05
    21
    0
    31
    1
    0
    LINE
    8
    1
    62
    2
    10
    0.1
    20
    0
    30
    0
    11
    0.1
    21
    0
    31
    1
    0
    LINE
    8
    1
    62
    3
    10
    0.15
    20
    0
    30
    0
    11
    0.15
    21
    0
    31
    1
    0
    LINE
    8
    1
    62
    4
    10
    0.2
    20
    0
    30
    0
    11
    0.2
    21
    0
    31
    1
    0
    LINE
    8
    1
    62
    5
    10
    0.25
    20
    0
    30
    0
    11
    0.25
    21
    0
    31
    1
    0
    LINE
    8
    1
    62
    6
    10
    0.3
    20
    0
    30
    0
    11
    0.3
    21
    0
    31
    1
    0
    LINE
    8
    1
    62
    7
    10
    0.35
    20
    0
    30
    0
    11
    0.35
    21
    0
    31
    1
    0
    LINE
    8
    1
    62
    8
    10
    0.4
    20
    0
    30
    0
    11
    0.4
    21
    0
    31
    1
    0
    LINE
    8
    1
    62
    9
    10
    0.45
    20
    0
    30
    0
    11
    0.45
    21
    0
    31
    1
    0
    LINE
    8
    1
    62
    10
    10
    0.5
    20
    0
    30
    0
    11
    0.5
    21
    0
    31
    1
    0
    LINE
    8
    1
    62
    11
    10
    0.55
    20
    0
    30
    0
    11
    0.55
    21
    0
    31
    1
    0
    LINE
    8
    1
    62
    12
    10
    0.6
    20
    0
    30
    0
    11
    0.6
    21
    0
    31
    1
    0
    LINE
    8
    1
    62
    13
    10
    0.65
    20
    0
    30
    0
    11
    0.65
    21
    0
    31
    1
    0
    LINE
    8
    1
    62
    14
    10
    0.7
    20
    0
    30
    0
    11
    0.7
    21
    0
    31
    1
    0
    LINE
    8
    1
    62
    15
    10
    0.75
    20
    0
    30
    0
    11
    0.75
    21
    0
    31
    1
    0
    LINE
    8
    1
    62
    16
    10
    0.8
    20
    0
    30
    0
    11
    0.8
    21
    0
    31
    1
    0
    LINE
    8
    1
    62
    17
    10
    0.85
    20
    0
    30
    0
    11
    0.85
    21
    0
    31
    1
    0
    LINE
    8
    1
    62
    18
    10
    0.9
    20
    0
    30
    0
    11
    0.9
    21
    0
    31
    1
    0
    LINE
    8
    1
    62
    19
    10
    0.95
    20
    0
    30
    0
    11
    0.95
    21
    0
    31
    1
    0
    LINE
    8
    1
    62
    20
    10
    1
    20
    0
    30
    0
    11
    1
    21
    0
    31
    1
    0
    LINE
    8
    1
    62
    21
    10
    1.05
    20
    0
    30
    0
    11
    1.05
    21
    0
    31
    1
    0
    LINE
    8
    1
    62
    22
    10
    1.1
    20
    0
    30
    0
    11
    1.1
    21
    0
    31
    1
    0
    LINE
    8
    1
    62
    23
    10
    1.15
    20
    0
    30
    0
    11
    1.15
    21
    0
    31
    1
    0
    LINE
    8
    1
    62
    24
    10
    1.2
    20
    0
    30
    0
    11
    1.2
    21
    0
    31
    1
    0
    LINE
    8
    1
    62
    25
    10
    1.25
    20
    0
    30
    0
    11
    1.25
    21
    0
    31
    1
    0
    LINE
    8
    1
    62
    26
    10
    1.3
    20
    0
    30
    0
    11
    1.3
    21
    0
    31
    1
    0
    LINE
    8
    1
    62
    27
    10
    1.35
    20
    0
    30
    0
    11
    1.35
    21
    0
    31
    1
    0
    LINE
    8
    1
    62
    28
    10
    1.4
    20
    0
    30
    0
    11
    1.4
    21
    0
    31
    1
    0
    LINE
    8
    1
    62
    29
    10
    1.45
    20
    0
    30
    0
    11
    1.45
    21
    0
    31
    1
    0
    LINE
    8
    1
    62
    30
    10
    1.5
    20
    0
    30
    0
    11
    1.5
    21
    0
    31
    1
    0
    LINE
    8
    1
    62
    31
    10
    1.55
    20
    0
    30
    0
    11
    1.55
    21
    0
    31
    1
    0
    LINE
    8
    1
    62
    32
    10
    1.6
    20
    0
    30
    0
    11
    1.6
    21
    0
    31
    1
    0
    LINE
    8
    1
    62
    33
    10
    1.65
    20
    0
    30
    0
    11
    1.65
    21
    0
    31
    1
    0
    LINE
    8
    1
    62
    34
    10
    1.7
    20
    0
    30
    0
    11
    1.7
    21
    0
    31
    1
    0
    LINE
    8
    1
    62
    35
    10
    1.75
    20
    0
    30
    0
    11
    1.75
    21
    0
    31
    1
    0
    LINE
    8
    1
    62
    36
    10
    1.8
    20
    0
    30
    0
    11
    1.8
    21
    0
    31
    1
    0
    LINE
    8
    1
    62
    37
    10
    1.85
    20
    0
    30
    0
    11
    1.85
    21
    0
    31
    1
    0
    LINE
    8
    1
    62
    38
    10
    1.9
    20
    0
    30
    0
    11
    1.9
    21
    0
    31
    1
    0
    LINE
    8
    1
    62
    39
    10
    1.95
    20
    0
    30
    0
    11
    1.95
    21
    0
    31
    1
    0
    LINE
    8
    1
    62
    40
    10
    2
    20
    0
    30
    0
    11
    2
    21
    0
    31
    1
    0
    LINE
    8
    1
    62
    41
    10
    2.05
    20
    0
    30
    0
    11
    2.05
    21
    0
    31
    1
    0
    LINE
    8
    1
    62
    42
    10
    2.1
    20
    0
    30
    0
    11
    2.1
    21
    0
    31
    1
    0
    LINE
    8
    1
    62
    43
    10
    2.15
    20
    0
    30
    0
    11
    2.15
    21
    0
    31
    1
    0
    LINE
    8
    1
    62
    44
    10
    2.2
    20
    0
    30
    0
    11
    2.2
    21
    0
    31
    1
    0
    LINE
    8
    1
    62
    45
    10
    2.25
    20
    0
    30
    0
    11
    2.25
    21
    0
    31
    1
    0
    LINE
    8
    1
    62
    46
    10
    2.3
    20
    0
    30
    0
    11
    2.3
    21
    0
    31
    1
    0
    LINE
    8
    1
    62
    47
    10
    2.35
    20
    0
    30
    0
    11
    2.35
    21
    0
    31
    1
    0
    LINE
    8
    1
    62
    48
    10
    2.4
    20
    0
    30
    0
    11
    2.4
    21
    0
    31
    1
    0
    LINE
    8
    1
    62
    49
    10
    2.45
    20
    0
    30
    0
    11
    2.45
    21
    0
    31
    1
    0
    LINE
    8
    1
    62
    50
    10
    2.5
    20
    0
    30
    0
    11
    2.5
    21
    0
    31
    1
    0
    LINE
    8
    1
    62
    51
    10
    2.55
    20
    0
    30
    0
    11
    2.55
    21
    0
    31
    1
    0
    LINE
    8
    1
    62
    52
    10
    2.6
    20
    0
    30
    0
    11
    2.6
    21
    0
    31
    1
    0
    LINE
    8
    1
    62
    53
    10
    2.65
    20
    0
    30
    0
    11
    2.65
    21
    0
    31
    1
    0
    LINE
    8
    1
    62
    54
    10
    2.7
    20
    0
    30
    0
    11
    2.7
    21
    0
    31
    1
    0
    LINE
    8
    1
    62
    55
    10
    2.75
    20
    0
    30
    0
    11
    2.75
    21
    0
    31
    1
    0
    LINE
    8
    1
    62
    56
    10
    2.8
    20
    0
    30
    0
    11
    2.8
    21
    0
    31
    1
    0
    LINE
    8
    1
    62
    57
    10
    2.85
    20
    0
    30
    0
    11
    2.85
    21
    0
    31
    1
    0
    LINE
    8
    1
    62
    58
    10
    2.9
    20
    0
    30
    0
    11
    2.9
    21
    0
    31
    1
    0
    LINE
    8
    1
    62
    59
    10
    2.95
    20
    0
    30
    0
    11
    2.95
    21
    0
    31
    1
    0
    LINE
    8
    1
    62
    60
    10
    3
    20
    0
    30
    0
    11
    3
    21
    0
    31
    1
    0
    LINE
    8
    1
    62
    61
    10
    3.05
    20
    0
    30
    0
    11
    3.05
    21
    0
    31
    1
    0
    LINE
    8
    1
    62
    62
    10
    3.1
    20
    0
    30
    0
    11
    3.1
    21
    0
    31
    1
    0
    LINE
    8
    1
    62
    63
    10
    3.15
    20
    0
    30
    0
    11
    3.15
    21
    0
    31
    1
    0
    ENDSEC
    0
    EOF



    Appendix 2

    The following example is a complete description of a line, a
    triangular facet, and a four pointed facet. All the objects are on
    layer 1, and have colour index 1. This can be used to test whether the
    DXF importer you are using supports all of these 3D primitives. The
    resulting model should look like the following.

    999
    VISION3D DXF
    0
    SECTION
    2
    HEADER
    9
    $ACADVER
    1
    AC1006
    9
    $INSBASE
    10
    0.0
    20
    0.0
    30
    0.0
    9
    $EXTMIN
    10
    0.0
    20
    0.0
    9
    $EXTMAX
    10
    1000.0
    20
    1000.0
    9
    $LINMIN
    10
    0.0
    20
    0.0
    9
    $LINMAX
    10
    1000.0
    20
    1000.0
    0
    ENDSEC
    0
    SECTION
    2
    TABLES
    0
    TABLE
    2
    LTYPE
    70
    1
    0
    LTYPE
    2
    CONTINUOUS
    70
    64
    3
    Solid line
    72
    65
    73
    0
    40
    0.000000
    0
    ENDTAB
    0
    TABLE
    2
    LAYER
    70
    6
    0
    LAYER
    2
    1
    70
    64
    62
    7
    6
    CONTINUOUS
    0
    ENDTAB
    0
    TABLE
    2
    STYLE
    70
    0
    0
    ENDTAB
    0
    ENDSEC
    0
    SECTION
    2
    BLOCKS
    0
    ENDSEC
    0
    SECTION
    2
    ENTITIES
    0
    3DFACE
    8
    1
    62
    1
    10
    -0.5
    20
    -0.5
    30
    -0.5
    11
    -0.5
    21
    0.5
    31
    -0.5
    12
    0.5
    22
    0.5
    32
    -0.5
    13
    0.5
    23
    -0.5
    33
    -0.5
    0
    3DFACE
    8
    1
    62
    1
    10
    -0.5
    20
    -0.5
    30
    -0.5
    11
    0.5
    21
    -0.5
    31
    -0.5
    12
    0
    22
    -0.5
    32
    0.5
    13
    0
    23
    -0.5
    33
    0.5
    0
    LINE
    8
    1
    62
    1
    10
    0
    20
    -0.5
    30
    0.5
    11
    0
    21
    0.5
    31
    -0.5
    0
    ENDSEC
    0
    EOF

    That's the layout of a DXF file

    If you have ACAD, make a DXFOUT entitys only file and look at it. You can get away with a minimum structure file.
    Have fun!


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